AV:N/AC:M/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C
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The Cisco Wireless LAN Controller (WLC) product family is affected by the following vulnerabilities:
- Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability
- Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability
- Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability
- Cisco Wireless LAN Controllers Unauthorized Access Vulnerability
Cisco has released software updates that address these vulnerabilities. Workarounds are available that mitigate some of these vulnerabilities.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120229-wlc
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The Cisco WLC product family is affected by multiple vulnerabilities. Affected versions of Cisco WLC Software vary depending on the specific vulnerability.
Vulnerable Products
For specific version information, refer to the Software Versions and Fixes section of this advisory.
Each of the following products is affected by at least one of the vulnerabilities covered in this Security Advisory:
- Cisco 2000 Series WLC
- Cisco 2100 Series WLC
- Cisco 2500 Series WLC
- Cisco 4100 Series WLC
- Cisco 4400 Series WLC
- Cisco 5500 Series WLC
- Cisco 500 Series Wireless Express Mobility Controllers
- Cisco Wireless Services Modules (WiSM)
- Cisco Wireless Services Modules version 2 (WiSM version 2)
- Cisco NME-AIR-WLC Modules for Integrated Services Routers (ISRs)
- Cisco NM-AIR-WLC Modules for Integrated Services Routers (ISRs)
- Cisco Catalyst 3750G Integrated WLCs
- Cisco Flex 7500 Series Cloud Controllers
Model
End of Life Document URL
Cisco 2000 Series WLC
Cisco 4100 Series WLC
Cisco NM-AIR-WLC Modules for ISR
Cisco 500 Series Wireless Express Mobility Controllers
http://www.cisco.com/en/US/prod/collateral/wireless/ps7306/ps7320/ps7339/end_of_life_c51-568040.html
Determination of Software Versions
- In the web interface, choose the Monitor tab, click Summary in the left pane, and note the Software Version field.
- In the command-line interface, issue the show sysinfo command as shown in the following example:
(Cisco Controller)> show sysinfo
Manufacturer's Name.. Cisco Systems Inc.
Product Name......... Cisco Controller
Product Version...... 5.1.151.0
RTOS Version......... Linux-2.6.10_mvl401
Bootloader Version... 4.0.207.0
Build Type........... DATA + WPS
<output suppressed>Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Cisco WLCs and Cisco WiSMs are responsible for system-wide wireless LAN functions, such as security policies, intrusion prevention, RF management, quality of service (QoS), and mobility.
These devices communicate with controller-based access points over any Layer 2 (Ethernet) or Layer 3 (IP) infrastructure using the Lightweight Access Point Protocol (LWAPP) and the Control and Provisioning of Wireless Access Points (CAPWAP) protocol.
The Cisco WLC family of devices is affected by the following vulnerabilities:
Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability
The Cisco Wireless LAN Controller (WLC) product family is affected by a denial of service (DoS) vulnerability that could allow an unauthenticated, remote attacker to cause the device to crash by submitting a malformed URL to the administrative management interface.
Both HTTP and HTTPs are affected by this vulnerability.
This vulnerability is documented in Cisco bug ID CSCts81997 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-0368.
Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability
The Cisco Wireless LAN Controller (WLC) product family is affected by a denial of service (DoS) vulnerability where an unauthenticated attacker could cause a device reload by sending a series of IPv6 packets.
The IPv6 pass-through feature is not affected by this vulnerability. Legitimate IPv6 traffic can trigger this vulnerability.
Note: Cisco 4400 Series WLC, Cisco Wireless Services Modules (WiSM), and Cisco Catalyst 3750G Integrated WLCs are not affected by this vulnerability.
This vulnerability is documented in Cisco bug ID CSCtt07949 (registered customers only) and has been assigned CVE ID CVE-2012-0369.
Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability
The Cisco Wireless LAN Controller (WLC) product family is affected by a denial of service (DoS) vulnerability where an unauthenticated attacker could cause a device reload by sending a series of HTTP or HTTPS packets to an affected controller configured for WebAuth.
This vulnerability can be exploited from both wired and wireless segments. A TCP three-way handshake is needed in order to exploit this vulnerability.
This vulnerability is documented in Cisco bug ID CSCtt47435 (registered customers only)and has been assigned CVE ID CVE-2012-0370.
Cisco Wireless LAN Controllers Unauthorized Access Vulnerability
The Cisco Wireless LAN Controller (WLC) product family is affected by an unauthorized access vulnerability where an unauthenticated attacker could view and modify the configuration of an affected Cisco WLC.
This vulnerability exists if CPU-based access control lists (ACLs) are configured in the wireless controller. An attacker can exploit this vulnerability by connecting to the controller over TCP port 1023. Only the Cisco 4400 Series WLCs, WiSM version 1, and Cisco Catalyst 3750G Integrated WLCs are affected by this vulnerability.
This vulnerability is documented in Cisco bug ID CSCtu56709 (registered customers only) and has been assigned CVE ID CVE-2012-0371.
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This Cisco Security Advisory describes multiple distinct vulnerabilities. These vulnerabilities and their respective workarounds are independent of each other.
Cisco Wireless LAN Controllers HTTP Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability.
Cisco Wireless LAN Controllers IPv6 Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability.
Cisco Wireless LAN Controllers WebAuth Denial of Service Vulnerability
There are no workarounds to mitigate this vulnerability.
Cisco Wireless LAN Controllers Unauthorized Access Vulnerability
CPU based ACLs can be configured to block access to the affected WLC on TCP port 1023. After ACLs are defined, they can be applied to the management interface, the access point manager (AP-manager) interface, or any of the dynamic interfaces for client data traffic or to the Network Processing Unit (NPU) interface for traffic to the controller CPU.
Additional mitigations that can be deployed on Cisco devices in the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory, which is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20120229-wlc
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
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. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable.
Vulnerability/Bug ID
Affected Release
First Fixed Release
HTTP DoS Vulnerability (CSCts81997)
4.0
Vulnerable; Migrate to 7.0 or later
4.1
Vulnerable; Migrate to 7.0 or later
4.1M
Vulnerable; Migrate to 7.0 or later
4.2
Vulnerable; Migrate to 7.0 or later
4.2M
Vulnerable; Migrate to 7.0 or later
5.0
Vulnerable; Migrate to 7.0 or later
5.1
Vulnerable; Migrate to 7.0 or later
5.2
Vulnerable; Migrate to 7.0 or later
6.0
Vulnerable; Migrate to 7.0 or later
7.0
7.0.121.3
(7.0.220.0 CCO)7.1
7.1.90.2
(7.1.91.0 CCO)7.2
7.2.1.57
(7.2.103.0 CCO)
IPv6DoS Vulnerability (CSCtt07949)
4.0 Not Vulnerable
4.1
Not Vulnerable
4.1M
Not Vulnerable
4.2
Not Vulnerable
4.2M
Not Vulnerable
5.0 Not Vulnerable
5.1
Not Vulnerable
5.2
Not Vulnerable
6.0
Vulnerable; Migrate to 7.0 or later
7.0
7.0.121.3
(7.0.220.0 CCO)7.1
7.1.90.2
(7.1.91.0 CCO)7.2
7.2.1.58
(7.2.103.0 CCO)WebAuth DoS Vulnerability (CSCtt47435)
4.0
Vulnerable; Migrate to 7.0 or later
4.1
Vulnerable; Migrate to 7.0 or later
4.1M
Vulnerable; Migrate to 7.0 or later
4.2
Vulnerable; Migrate to 7.0 or later
4.2M
Vulnerable; Migrate to 7.0 or later
5.0
Vulnerable; Migrate to 7.0 or later
5.1
Vulnerable; Migrate to 7.0 or later
5.2
Vulnerable; Migrate to 7.0 or later
6.0
Vulnerable; Migrate to 7.0 or later
7.0
7.0.121.5
(7.0.220.0 CCO)7.1
7.1.90.5
(7.1.91.0 CCO)7.2
Not Vulnerable
Unauthorized Access Vulnerability (CSCtu56709)
4.0
Vulnerable; Migrate to 7.0 or later
4.1
Vulnerable; Migrate to 7.0 or later
4.1M
Vulnerable; Migrate to 7.0 or later
4.2
Vulnerable; Migrate to 7.0 or later
4.2M
Vulnerable; Migrate to 7.0 or later
5.0
Vulnerable; Migrate to 7.0 or later
5.1
Vulnerable; Migrate to 7.0 or later
5.2
Vulnerable; Migrate to 7.0 or later
6.0
Vulnerable; Migrate to 7.0 or later
7.0
7.0.220.4
(7.0.230.0 CCO)7.1
Not Vulnerable
7.2 Not Vulnerable
Recommended Releases
The "Recommended Release" table lists the releases which have fixes for all the published vulnerabilities at the time of this Advisory. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" table.
Affected Release
Recommended Release
7.0
7.0.230.0
7.1
7.1.91.0
7.2
7.2.103.0
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
These vulnerabilities were found during internal testing and during the troubleshooting of customer service requests.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Revision 1.2 2012-March-16 Software table update. Revision 1.1 2012-March-1 Software table update. Revision 1.0 2012-February-29 Initial public release.
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