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Advisory ID: cisco-sa-20100324-h323

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-h323

Revision 1.1

Last Updated  2012 September 21 19:08  UTC (GMT)

For Public Release 2010 March 24 16:00  UTC (GMT)

Summary

The H.323 implementation in Cisco IOS Software contains two vulnerabilities that may be exploited remotely to cause a denial of service (DoS) condition on a device that is running a vulnerable version of Cisco IOS Software.

Cisco has released free software updates that address these vulnerabilities. There are no workarounds to mitigate these vulnerabilities other than disabling H.323 on the vulnerable device if H.323 is not required.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-h323.

Note:  The March 24, 2010, Cisco IOS Software Security Advisory bundled publication includes seven Security Advisories. All the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at the following URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on March 24, 2010, or earlier:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-bundle

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar10.html

Affected Products

This vulnerability only affects devices running Cisco IOS Software with H.323 voice services enabled.

Vulnerable Products

Cisco devices that are running affected Cisco IOS Software versions that are configured to process H.323 messages are affected by these vulnerabilities. H.323 is not enabled by default.

To determine if the Cisco IOS Software device is running H.323 services, use the show process cpu | include 323 command, as shown in the following example:

Router#show process cpu | include 323
 249       16000           3       5333  0.00%  0.00%  0.00%   0 CCH323_CT
 250           0           1          0  0.00%  0.00%  0.00%   0 CCH323_DNS
Router#

In the previous example the processes CCH323_CT and CCH323_DNS are running on the device; subsequently, the device is listening to H.323 messages. The device is vulnerable as long as any of these processes (or similar) are active.

Note:  Only H.323 listening on port TCP 1720 is affected.

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:

Router#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 17-Mar-08 14:39 by dchih



!--- output truncated

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C1841-ADVENTERPRISEK9-M:

Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jul-08 20:25 by prod_rel_team



!--- output truncated

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/web/about/security/intelligence/ios-ref.html

Products Confirmed Not Vulnerable

Cisco IOS XR Software is not affected by these vulnerabilities.

No other Cisco products are currently known to be affected by these vulnerabilities.

Details

H.323 is the ITU standard for real-time multimedia communications and conferencing over packet-based (IP) networks. A subset of the H.323 standard is H.225.0, a standard used for call signaling protocols and media stream packetization over IP networks.

The H.323 implementation in Cisco IOS Software contains two DoS vulnerabilities. An attacker can exploit these vulnerabilities remotely by sending crafted H.323 packets to the affected device that is running Cisco IOS Software. A TCP three-way handshake is needed to exploit these vulnerabilities.

When exploited, the first vulnerability may lead to an interface queue wedge. The second vulnerability may cause a memory leak and, in most cases, the device to reload.

An interface queue wedge is a class of vulnerability in which certain packets are received and queued by a Cisco IOS router or switch, but due to a processing error, are never removed from the queue.

Received packets are counted against the interface input "queue," which is of a limited and relatively small size. For example, on most interface types on most platforms the default interface input queue is 75 packets, a value that can be configured via the hold-queue value in interface configuration command. Once the input queue contains nothing but packets that, due to a bug, will never be dequeued, the queue is said to be wedged. More recently this condition has been termed a "blocked interface".

This can be seen on a Cisco IOS device when the input queue size is equal to or greater than (depending on the Cisco IOS Software Release) the input queue max value, as shown below. In this example, the current "size" of the input queue is 75, which is equal to the "max" size of the input queue, which is also 75.

Router#show interface Ethernet 0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is 0001.0001.0001
  Internet address is 10.1.1.100/24
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:20, output 00:00:05, output hang never
  Last clearing of "show interface" counters never
  Input queue: 75/75/44/0 (size/max/drops/flushes);
 Total output drops: 0
  Queueing strategy: fifo


  Output queue: 0/40 (size/max)
  5 minute input rate 4000 bits/sec, 9 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     2937 packets input, 182298 bytes, 0 no buffer
     Received 7 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     58 packets output, 6540 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

For more information about queue wedges and a few detection mechanisms that may be used to identify a blocked interface on Cisco IOS Software (including an EEM script specifically for this purpose and a whitepaper describing how this condition can be detected using SNMP) go to: http://blogs.cisco.com/security/comments/cisco_ios_queue_wedges_explained/

To display detected memory leaks, use the show memory debug leaks command in privileged EXEC mode.

Router#show memory debug leaks
Adding blocks for GD...

                 I/O memory


Address    Size   Alloc_pc  PID  Alloc-Proc       Name

                 Processor memory


Address    Size   Alloc_pc  PID  Alloc-Proc       Name
640854D4     1940 622265A4  196  CCH323_CT       CCH323_CT
640EA5E8     1940 622265A4  196  CCH323_CT       CCH323_CT
65961B38     1940 622265A4  196  CCH323_CT       CCH323_CT

The previous example shows a memory leak in the process CCH323_CT. The show memory debug leaks command was introduced in Cisco IOS Software versions 12.3(8)T1 and 12.2(25)S, respectively.

caution Caution: All show memory debug commands must be used on customer networks only to diagnose the router for memory leaks when memory depletion is observed. These commands may cause high CPU utilization and may cause time sensitive protocols to flap. These commands are recommended to be used in maintenance windows when the device is not in a scaled condition.

These vulnerabilities are documented in Cisco Bug IDs CSCta19962 (registered customers only) and CSCtb93855 (registered customers only) and have been assigned CVE IDs CVE-2010-0582 and CVE-2010-0583.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss .

CSCta19962 - Interface queue wedge experienced when sending crafted H.323 packets

Calculate the environmental score of CSCta19962

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtb93855 - Memory leak after receiving H.323 crafted packets

Calculate the environmental score of CSCtb93855

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the vulnerabilities described in this advisory may cause the affected device to experience an interface queue wedge or to reload. Theses vulnerabilities could be exploited repeatedly to cause an extended DoS condition.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Bundle First Fixed Release" column indicates the earliest possible releases which have fixes for all the published vulnerabilities in this Cisco IOS Security Advisory bundled publication. Cisco recommends upgrading to the latest available release where possible.

Major Release

Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

There are no affected 12.0 based releases

Affected 12.1-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.1

Not Vulnerable

Not Vulnerable

12.1AA

Not Vulnerable

Not Vulnerable

12.1AX

Not Vulnerable

Releases up to and including 12.1(11)AX are not vulnerable; first fixed in 12.2SE

12.1AY

Not Vulnerable

Not Vulnerable

12.1AZ

Not Vulnerable

Not Vulnerable

12.1CX

Not Vulnerable

Not Vulnerable

12.1DA

Not Vulnerable

Not Vulnerable

12.1DB

Not Vulnerable

Not Vulnerable

12.1DC

Not Vulnerable

Not Vulnerable

12.1E

Not Vulnerable

Releases up to and including 12.1(7a)E1a are not vulnerable; migrate to any release in 12.2SXF

12.1EA

Not Vulnerable

Releases up to and including 12.1(6)EA2c are not vulnerable. Releases 12.1(8)EA1c and later are not vulnerable.

12.1EB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.1EC

Not Vulnerable

Releases up to and including 12.1(7)EC are not vulnerable; migrate to 12.2SCB

12.1EO

Not Vulnerable

Releases up to and including 12.1(19)EO6 are not vulnerable.

12.1EU

Not Vulnerable

Not Vulnerable

12.1EV

Not Vulnerable

Not Vulnerable

12.1EW

Not Vulnerable

Not Vulnerable

12.1EX

Not Vulnerable

Vulnerable; migrate to any release in 12.2

12.1EY

Not Vulnerable

Releases up to and including 12.1(7a)EY3 are not vulnerable.

12.1EZ

Not Vulnerable

Not Vulnerable

12.1GA

Not Vulnerable

Not Vulnerable

12.1GB

Not Vulnerable

Not Vulnerable

12.1T

Not Vulnerable

Not Vulnerable

12.1XA

Not Vulnerable

Not Vulnerable

12.1XB

Not Vulnerable

Not Vulnerable

12.1XC

Not Vulnerable

Not Vulnerable

12.1XD

Not Vulnerable

Not Vulnerable

12.1XE

Not Vulnerable

Not Vulnerable

12.1XF

Not Vulnerable

Not Vulnerable

12.1XG

Not Vulnerable

Not Vulnerable

12.1XH

Not Vulnerable

Not Vulnerable

12.1XI

Not Vulnerable

Not Vulnerable

12.1XJ

Not Vulnerable

Not Vulnerable

12.1XL

Not Vulnerable

Not Vulnerable

12.1XM

Not Vulnerable

Not Vulnerable

12.1XP

Not Vulnerable

Not Vulnerable

12.1XQ

Not Vulnerable

Not Vulnerable

12.1XR

Not Vulnerable

Not Vulnerable

12.1XS

Not Vulnerable

Not Vulnerable

12.1XT

Not Vulnerable

Not Vulnerable

12.1XU

Vulnerable; migrate to any release in 12.2

Vulnerable; migrate to any release in 12.2

12.1XV

Not Vulnerable

Releases prior to 12.1(5)XV1 are vulnerable, release 12.1(5)XV1 and later are not vulnerable

12.1XW

Not Vulnerable

Not Vulnerable

12.1XX

Not Vulnerable

Not Vulnerable

12.1XY

Not Vulnerable

Not Vulnerable

12.1XZ

Not Vulnerable

Not Vulnerable

12.1YA

Not Vulnerable

Not Vulnerable

12.1YB

Not Vulnerable

Vulnerable; migrate to any release in 12.2

12.1YC

Not Vulnerable

Not Vulnerable

12.1YD

Vulnerable; migrate to any release in 12.2

Vulnerable; migrate to any release in 12.2

12.1YE

Not Vulnerable

Releases prior to 12.1(5)YE6 are vulnerable, release 12.1(5)YE6 and later are not vulnerable.

12.1YF

Not Vulnerable

Not Vulnerable

12.1YH

Not Vulnerable

Not Vulnerable

12.1YI

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.1YJ

Not Vulnerable

Not Vulnerable

Affected 12.2-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.2

Not Vulnerable

Not Vulnerable

12.2B

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BC

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BW

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BX

Vulnerable; migrate to any release in 12.2SB

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BY

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BZ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2CX

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2CY

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2CZ

Vulnerable; migrate to any release in 12.2S

Vulnerable; migrate to any release in 12.2SRE

12.2DA

Not Vulnerable

Not Vulnerable

12.2DD

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2DX

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2EW

Not Vulnerable

Not Vulnerable

12.2EWA

Not Vulnerable

Not Vulnerable

12.2EX

Not Vulnerable

Releases up to and including 12.2(37)EX are not vulnerable.

Releases 12.2(44)EX and later are not vulnerable; first fixed in 12.2SE

12.2EY

Not Vulnerable

Releases prior to 12.2(37)EY are vulnerable, release 12.2(37)EY and later are not vulnerable

12.2EZ

Not Vulnerable

Not Vulnerable

12.2FX

Not Vulnerable

Not Vulnerable

12.2FY

Not Vulnerable

Not Vulnerable

12.2FZ

Not Vulnerable

Not Vulnerable

12.2IRA

Not Vulnerable

Vulnerable; first fixed in 12.2SRC

12.2IRB

Not Vulnerable

Vulnerable; first fixed in 12.2SRC

12.2IRC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IRD

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXD

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXE

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXF

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXG

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXH

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2JA

Not Vulnerable

Releases up to and including 12.2(4)JA1 are not vulnerable.

12.2JK

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2MB

Not Vulnerable

Not Vulnerable

12.2MC

Releases up to and including 12.2(15)MC1 are not vulnerable.

Releases 12.2(15)MC2b and later are not vulnerable; first fixed in 15.0M

Vulnerable; first fixed in 12.4

12.2MRA

Not Vulnerable

Not Vulnerable

12.2S

Not Vulnerable

Releases prior to 12.2(30)S are vulnerable, release 12.2(30)S and later are not vulnerable;

12.2SB

Not Vulnerable

12.2(33)SB8

12.2(31)SB18; Available on 24-MAR-10

12.2SBC

Not Vulnerable

Vulnerable; migrate to any release in 12.2SRE

12.2SCA

Not Vulnerable

Vulnerable; first fixed in 12.2SCB

12.2SCB

Not Vulnerable

12.2(33)SCB6

12.2SCC

Not Vulnerable

12.2(33)SCC1

12.2SCD

Not Vulnerable

Not Vulnerable

12.2SE

Not Vulnerable

12.2(50)SE4; Available on 25-MAR-10

12.2SEA

Not Vulnerable

Not Vulnerable

12.2SEB

Not Vulnerable

Not Vulnerable

12.2SEC

Not Vulnerable

Not Vulnerable

12.2SED

Not Vulnerable

Vulnerable; first fixed in 12.2SE

12.2SEE

Not Vulnerable

Vulnerable; first fixed in 12.2SE

12.2SEF

Not Vulnerable

Not Vulnerable

12.2SEG

Not Vulnerable

Releases prior to 12.2(25)SEG4 are vulnerable, release 12.2(25)SEG4 and later are not vulnerable; first fixed in 12.2SE

12.2SG

Not Vulnerable

Releases up to 12.2(31)SG1 are not vulnerable; releases 12.2(40)SG and later are not vulnerable.

12.2SGA

Not Vulnerable

Not Vulnerable

12.2SL

Not Vulnerable

Not Vulnerable

12.2SM

Not Vulnerable

Not Vulnerable

12.2SO

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SQ

Not Vulnerable

Not Vulnerable

12.2SRA

Not Vulnerable

Vulnerable; first fixed in 12.2SRD

12.2SRB

Not Vulnerable

Vulnerable; first fixed in 12.2SRD

12.2SRC

Not Vulnerable

12.2(33)SRC5

12.2SRD

Not Vulnerable

12.2(33)SRD3

12.2SRE

Not Vulnerable

Not Vulnerable

12.2STE

Not Vulnerable

Not Vulnerable

12.2SU

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2SV

Not Vulnerable

Releases up to and including 12.2(18)SV2 are not vulnerable.

12.2SVA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SVC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SVD

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SVE

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SW

Not Vulnerable

Releases up to and including 12.2(25)SW3 are not vulnerable.

Releases 12.2(25)SW12 and later are not vulnerable; first fixed in 15.0M

12.2SX

Not Vulnerable

Vulnerable; first fixed in 12.2SXF

12.2SXA

Not Vulnerable

Vulnerable; first fixed in 12.2SXF

12.2SXB

Not Vulnerable

Vulnerable; first fixed in 12.2SXF

12.2SXD

Not Vulnerable

Vulnerable; first fixed in 12.2SXF

12.2SXE

Not Vulnerable

Vulnerable; first fixed in 12.2SXF

12.2SXF

Not Vulnerable

12.2(18)SXF17a

12.2SXH

Not Vulnerable

12.2(33)SXH6

12.2SXI

Not Vulnerable

12.2(33)SXI2a

12.2(33)SXI3

12.2SY

Not Vulnerable

Vulnerable; migrate to any release in 12.2SRE

12.2SZ

Not Vulnerable

Vulnerable; migrate to any release in 12.2SRE

12.2T

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2TPC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2XA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XB

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XD

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XE

Not Vulnerable

Not Vulnerable

12.2XF

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XG

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XH

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XI

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XJ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XK

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XL

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XM

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XN

Not Vulnerable

Releases prior to 12.2(33)XN1 are vulnerable, release 12.2(33)XN1 and later are not vulnerable; first fixed in 12.2SRC

12.2XNA

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNB

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNC

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XND

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNE

12.2(33)XNE1; Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNF

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XO

Not Vulnerable

Not Vulnerable

12.2XQ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XR

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XS

Not Vulnerable

Not Vulnerable

12.2XT

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XU

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XV

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XW

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YB

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YE

Not Vulnerable

Not Vulnerable

12.2YF

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YG

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YH

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YJ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YK

Not Vulnerable

Not Vulnerable

12.2YL

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YM

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YN

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YO

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YP

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YQ

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YR

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YS

Not Vulnerable

Not Vulnerable

12.2YT

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YU

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YV

Releases prior to 12.2(11)YV1 are vulnerable, release 12.2(11)YV1 and later are not vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YW

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YX

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YY

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YZ

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZA

Not Vulnerable

Vulnerable; first fixed in 12.2SXF

12.2ZB

Releases up to and including 12.2(8)ZB are not vulnerable.

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZE

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZF

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZG

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZH

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZJ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZL

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZP

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZU

Not Vulnerable

Vulnerable; first fixed in 12.2SXH

12.2ZX

Not Vulnerable

Vulnerable; migrate to any release in 12.2SRE

12.2ZY

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZYA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Affected 12.3-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.3

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3B

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3BC

Not Vulnerable

Vulnerable; first fixed in 12.2SCB

12.3BW

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3EU

Not Vulnerable

Not Vulnerable

12.3JA

Not Vulnerable

Releases prior to 12.3(11)JA5 are vulnerable, release 12.3(11)JA5 and later are not vulnerable

12.3JEA

Not Vulnerable

Releases prior to 12.3(8)JEA4 are vulnerable, release 12.3(8)JEA4 and later are not vulnerable

12.3JEB

Not Vulnerable

Releases prior to 12.3(8)JEB2 are vulnerable, release 12.3(8)JEB2 and later are not vulnerable

12.3JEC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3JED

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3JK

Releases up to and including 12.3(2)JK3 are not vulnerable.

Releases 12.3(8)JK1 and later are not vulnerable; first fixed in 15.0M

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3JL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3JX

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3T

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3TPC

Releases up to and including 12.3(4)TPC11a are not vulnerable.

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3VA

Not Vulnerable

Not Vulnerable

12.3XA

Releases prior to 12.3(2)XA7 are vulnerable, release 12.3(2)XA7 and later are not vulnerable; first fixed in 15.0M

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XB

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3XC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XD

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XE

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; first fixed in 12.4

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XF

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3XG

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XI

Note: Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable;

Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable

12.3XJ

Vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3XK

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XL

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XQ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XR

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XS

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XU

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XW

Vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3XX

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XY

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XZ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YA

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YD

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YF

Vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3YG

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YH

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YI

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YJ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YK

Releases prior to 12.3(11)YK3 are vulnerable, release 12.3(11)YK3 and later are not vulnerable; first fixed in 12.4T

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YM

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YQ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YS

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YT

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YU

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YX

Vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3YZ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3ZA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Affected 12.4-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.4

12.4(25c)

15.0(1)M1

12.4(25c)

15.0(1)M1

12.4GC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JDA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JDC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JDD

Not Vulnerable

12.4(10b)JDD1

12.4JHA

Not Vulnerable

Not Vulnerable

12.4JK

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JMA

Not Vulnerable

Releases prior to 12.4(3g)JMA2 are vulnerable, release 12.4(3g)JMA2 and later are not vulnerable

12.4JMB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JX

Not Vulnerable

Vulnerable; first fixed in 12.4JA

12.4MD

Not Vulnerable

12.4(24)MD

12.4MDA

Not Vulnerable

12.4(22)MDA2

12.4MR

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4SW

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4T

12.4(15)T12

12.4(24)T3; Available on 26-MAR-10

12.4(22)T4

12.4(15)T12

12.4(20)T5

12.4(24)T3; Available on 26-MAR-10

12.4(22)T4

12.4XA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XB

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XD

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XE

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XF

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XG

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XJ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XK

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XL

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XM

Releases up to and including 12.4(15)XM are not vulnerable.

Releases 12.4(15)XM3 and later are not vulnerable; first fixed in 12.4T

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XN

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XP

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XQ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XR

Not Vulnerable

12.4(22)XR3

12.4XT

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XV

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XW

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XY

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XZ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4YA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4YB

12.4(22)YB5

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4YD

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4YE

Not Vulnerable

12.4(22)YE2

12.4(24)YE

12.4YG

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Affected 15.0-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

15.0M

15.0(1)M1

15.0(1)M1

Affected 15.1-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

There are no affected 15.1 based releases

Cisco IOS-XE Software

IOS-XE Release

First Fixed Release

2.1.x

Not Vulnerable

2.2.x

Not Vulnerable

2.3.x

Not Vulnerable

2.4.x

Not Vulnerable

2.5.x

2.5.1

2.6.x

Not Vulnerable

Workarounds

There are no workarounds to mitigate these vulnerabilities apart from disabling H.323 if the Cisco IOS device does not need it. Applying access lists on interfaces that should not accept H.323 traffic and putting firewalls in strategic locations may greatly reduce exposure until an upgrade can be performed.

Cisco provides Solution Reference Network Design (SRND) guides to help design and deploy networking solutions, which can be found at http://www.cisco.com/go/srnd Voice Security best practices are covered in the Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 6.x at http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/6x/security.html.

You can use the call service stop forced command under the voice service voip mode, as shown in the following example:

voice service voip
 h323
  call service stop forced

Note:  The call service stop forced command disables all H.323 call processing.

Additional mitigations that can be deployed on Cisco devices within the network are available in the companion document "Cisco Applied Mitigation Bulletin: Identifying and Mitigating Exploitation of the Denial of Service Vulnerabilities in Cisco Unified Communications Manager and Cisco IOS Software", which is available at the following location: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20100324-voice

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers using Third Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was found during internal testing.

Status of this Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-h323

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.


Revision History

Revision 1.1

2010-March-26

Added caution about debug commands.

Revision 1.0

2010-March-24

Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.