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Multiple Vulnerabilities in Cisco TelePresence Multipoint Switch

Advisory ID: cisco-sa-20110223-telepresence-ctms

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110223-telepresence-ctms

Revision 1.1

Last Updated  2011 March 9 21:00  UTC (GMT)

For Public Release 2011 Februrary 23 16:00  UTC (GMT)


Summary

Multiple vulnerabilities exist within the Cisco TelePresence Multipoint Switch. This security advisory outlines details of the following vulnerabilities:

  • Unauthenticated Java Servlet Access
  • Unauthenticated Arbitrary File Upload
  • Cisco Discovery Protocol Remote Code Execution
  • Unauthorized Servlet Access
  • Java RMI Denial of Service
  • Real-Time Transport Control Protocol Denial of Service
  • XML-Remote Procedure Call (RPC) Denial of Service

Duplicate Issue Identification in Other Cisco TelePresence Advisories

The Unauthenticated Java Servlet Access vulnerability affects the Cisco TelePresence Multipoint Switch and Recording Server. The defect as related to each component is covered in each associated advisory. The Cisco bug IDs for these defects are as follows:

  • Cisco TelePresence Multipoint Switch - CSCtf42008
  • Cisco TelePresence Recording Server - CSCtf42005

The Unauthenticated Arbitrary File Upload vulnerability affects the Cisco TelePresence Multipoint Switch and Recording Server. The defect as related to each component is covered in each associated advisory. The Cisco bug IDs for these defects are as follows:

  • Cisco TelePresence Multipoint Switch - CSCth61065
  • Cisco TelePresence Recording Server - CSCth85786

The Cisco Discovery Protocol Remote Code Execution vulnerability affects Cisco TelePresence endpoint devices, Manager, Multipoint Switch, and Recording Server. The defect as related to each component is covered in each associated advisory. The Cisco bug IDs for these defects are as follows:

  • Cisco TelePresence endpoint devices - CSCtd75754
  • Cisco TelePresence Manager - CSCtd75761
  • Cisco TelePresence Multipoint Switch - CSCtd75766
  • Cisco TelePresence Recording Server - CSCtd75769

The Java RMI Denial of Service vulnerability affects the Cisco TelePresence Multipoint Switch and Recording Server. The defect as related to each component is covered in each associated advisory. The Cisco bug IDs for these defects are as follows:

  • Cisco TelePresence Multipoint Switch - CSCtg35830
  • Cisco TelePresence Recording Server - CSCtg35825

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110223-telepresence-ctms.

Affected Products

These vulnerabilities affect the Cisco TelePresence Multipoint Switch. All releases of Cisco TelePresence System Software prior to 1.7.1 are affected by one or more of the vulnerabilities listed in this advisory.

The following table provides information pertaining to affected software releases:

Description

Cisco Bug ID

Affected Software Releases

Unauthenticated Java Servlet Access

CSCtf01253

1.0.x, 1.1.x, 1.5.x, 1.6.x

Unauthenticated Java Servlet Access

CSCtf42008

1.0.x, 1.1.x, 1.5.x, 1.6.x

Unauthenticated Arbitrary File Upload

CSCth61065

1.0.x, 1.1.x, 1.5.x, 1.6.x

Cisco Discovery Protocol Remote Code Execution

CSCtd75766

1.0.x, 1.1.x, 1.5.x, 1.6.x

Unauthorized Servlet Access

CSCtf97164

1.0.x, 1.1.x, 1.5.x, 1.6.x

Java RMI Denial of Service

CSCtg35825

1.0.x, 1.1.x, 1.5.x, 1.6.x

Real-Time Transport Control Protocol Denial of Service

CSCth60993

1.0.x, 1.1.x, 1.5.x, 1.6.x

XML-RPC Denial of Service

CSCtj44534

1.0.x, 1.1.x, 1.5.x, 1.6.x, 1.7.0, 1.7.1

Vulnerable Products

Cisco TelePresence Multipoint Switch devices running an affected version of software are affected.

To determine the current version of software running on the Cisco TelePresence Multipoint Switch, establish an SSH connection to the device and issue the show version active and the show version inactive commands. The output should resemble the following example:

admin: show version active
Active Master Version: 1.7.0.0-471


Active Version Installed Software Options: 
No Installed Software Options Found.

admin: show version inactive
Inactive Master Version: 1.6.1.0-336

Inactive Version Installed Software Options: 
No Installed Software Options Found.

In the preceding example, the system has versions 1.6.1 and 1.7.0 loaded on the device and version 1.7.0 is currently active. A device is only affected by vulnerabilities in the active software version.

Products Confirmed Not Vulnerable

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

Details

The Cisco TelePresence solution allows for immersive, in-person communication and collaboration over the network with colleagues, prospects, and partners even when they are located in opposite hemispheres.

This security advisory describes multiple, distinct vulnerabilities in the Cisco TelePresence Multipoint Switch. These vulnerabilities are independent of each other.

Unauthenticated Java Servlet Access

A number of sensitive Java Servlets delivered via a Java Servlet framework in the Cisco Telepresence Multipoint Switch could allow a remote, unauthenticated attacker to perform actions that should be restricted to administrative users only. The attacker would need the ability to submit a crafted request to an affected device on TCP port 80, 443, or 8080.

An attacker must perform a three-way TCP handshake and establish a valid session to exploit these vulnerabilities.

Unauthenticated Arbitrary File Upload

An arbitrary file upload vulnerability exists in the administrative web interface of the Cisco TelePresence Multipoint Switch. An unauthenticated, remote attacker could submit a crafted request to an affected device that would allow for the placement of attacker-controlled content in arbitrary locations on the device. The attacker would need the ability to submit a crafted request to an affected device on TCP port 80 or 443.

An attacker must perform a three-way TCP handshake and establish a valid session to exploit this vulnerability.

Cisco Discovery Protocol Remote Code Execution

A remote code execution vulnerability exists in Cisco TelePresence Multipoint Switch devices. An unauthenticated, adjacent attacker could exploit the vulnerability by submitting a malicious Cisco Discovery Protocol packet to the affected system. When parsed, the malicious packet may trigger a buffer overflow.

Because Cisco Discovery Protocol works at the data link layer (Layer 2), an attacker must have a way to submit an Ethernet frame directly to an affected device. This may be possible in situations where the affected system is part of a bridged network or connected to a nonpartitioned device such as a network hub.

Unauthorized Servlet Access

An unauthorized servlet access issue exists in the administrative web interface of Cisco TelePresence Multipoint Switch devices. This issue could allow a remote, authenticated attacker with unprivileged access to cause a denial of service condition on an affected device. The attacker would need the ability to submit a crafted request to an affected device on TCP port 80 or 443.

An attacker must perform a three-way TCP handshake and establish a valid session to exploit this vulnerability.

Java RMI Denial of Service

A denial of service vulnerability exists in Cisco TelePresence Multipoint Switch devices due to a failure to properly restrict access to the RMI interface of the Java Servlet framework. An unauthenticated, remote attacker could trigger an out-of-memory condition on the servlet host by issuing a series of crafted requests. The attacker would need the ability to communicate to an affected device on TCP port 8999.

An attacker must perform a three-way TCP handshake and establish a valid session to exploit this vulnerability.

Real-Time Transport Control Protocol Denial of Service

A Real-Time Transport Control Protocol (RTCP) denial of service vulnerability exists within Cisco TelePresence Multipoint Switch devices. An unauthenticated, remote attacker could send a malicious RTCP packet to a listening RTCP control port to crash the call control process. The attacker would need to have the ability to communicate to an affected device on a UDP port that was randomly selected and negotiated during call setup.

Because the vulnerability is within a UDP-based service, the attacker would not be required to perform a handshake prior to making the crafted request. This could allow the attacker to spoof the source address of an attack.

XML-RPC Denial of Service

An XML-RPC denial of service vulnerability exists in Cisco TelePresence Multipoint Switch devices. A remote, unauthenticated attacker could send a malicious request to an affected device to trigger a crash of the call geometry process. The attacker would need the ability to communicate to an affected device on TCP port 9000.

An attacker must perform a three-way TCP handshake and establish a valid session to exploit this vulnerability.

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 .

CSCtf42008 - Unauthenticated Java Servlet Access

Calculate the environmental score of CSCtf42008

CVSS Base Score - 10.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Complete

Complete

Complete

CVSS Temporal Score - 8.3

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtf01253 - Unauthenticated Java Servlet Access

Calculate the environmental score of CSCtf01253

CVSS Base Score - 10.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Complete

Complete

Complete

CVSS Temporal Score - 8.3

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCth61065 - Unauthenticated Arbitrary File Upload

Calculate the environmental score of CSCth61065

CVSS Base Score - 10.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Complete

Complete

Complete

CVSS Temporal Score - 8.3

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtd75766 - Cisco Discovery Protocol Remote Code Execution

Calculate the environmental score of CSCtd75766

CVSS Base Score - 7.9

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Adjacent Network

Medium

None

Complete

Complete

Complete

CVSS Temporal Score - 6.5

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtf97164 - Unauthorized Servlet Access

Calculate the environmental score of CSCtf97164

CVSS Base Score - 8.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Partial

Partial

Complete

CVSS Temporal Score - 6.6

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtg35825 - Java RMI Denial of Service

Calculate the environmental score of CSCtg35825

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

CSCth60993 - Real-Time Transport Control Protocol Denial of Service

Calculate the environmental score of CSCth60993

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

CSCtj44534 - XML-RPC Denial of Service

Calculate the environmental score of CSCtj44534

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 - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Unavailable

Confirmed

Impact

Successful exploitation of the Unauthenticated Java Servlet (CSCtf42008, CSCtf01253) vulnerabilities could allow an unauthenticated, remote attacker to take complete control of the affected device.

Successful exploitation of the Unauthenticated Arbitrary File Upload (CSCth61065) vulnerability could allow an unauthenticated, remote attacker to place or overwrite arbitrary files on the affected system. This may allow the attacker to gain full control of the affected device.

Successful exploitation of the Cisco Discovery Protocol Remote Code Execution (CSCtd75766) vulnerability could allow an unauthenticated, adjacent attacker to take complete control of the affected system.

Successful exploitation of the Unauthorized Servlet Access (CSCtf97164) vulnerability could allow a remote, authenticated attacker to perform certain actions on the system that should be restricted by the attacker's privilege level.

Successful exploitation of the Java RMI Denial of Service (CSCtg35825) vulnerability could allow an unauthenticated, remote attacker to cause all web-based services to become inaccessible.

Successful exploitation of the Real-Time Transport Control Protocol Denial of Service (CSCth60993) vulnerability could allow an unauthenticated, remote attacker to terminate all active calls on the affected device.

Successful exploitation of the XML-RPC Denial of Service (CSCtj44534) vulnerability could allow an unauthenticated, remote attacker to terminate all current calls and potentially cause the device to become unusable for future calls.

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 following Cisco TelePresence System Software table defines a specific defect, the "First Fixed Release", and the "Recommended Release" to resolve all of the security issues identified in this advisory as well as other non-security related issues. Cisco recommends upgrading to a release equal to or later than the release in the Recommended Release column of the table.

Vulnerability

Bug ID

Component

First Fixed Version

Recommended Release

Unauthenticated Java Servlet Access

CSCtf01253

CTMS

1.7.0

1.7.1

CSCtf42008

CTMS

1.7.0

1.7.1

Unauthenticated Arbitrary File Upload

CSCth61065

CTMS

1.7.0

1.7.1

Cisco Discovery Protocol Remote Code Execution

CSCtd75766

CTMS

1.7.0

1.7.1

Unauthorized Servlet Access

CSCtf97164

CTMS

1.7.0

1.7.1

Java RMI JBOSS Denial of Service

CSCtg35825

CTMS

1.7.0

1.7.1

Real-Time Transport Control Protocol Denial of Service

CSCth60993

CTMS

1.7.0

1.7.1

XML-RPC Denial of Service

CSCtj44534

CTMS

1.7.2 – Estimated Availability is End of March 2011

1.7.2 – Estimated Availability is End of March 2011

It is recommended that all components of the Cisco TelePresence solution be upgraded to 1.7.1 or greater.

Workarounds

There are no device- or system-based workarounds for the identified vulnerabilities.

Additional mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Intelligence companion document for this Advisory:

http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20110223-telepresence

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 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 vulnerabilities described in this advisory.

All vulnerabilities identified within this Cisco Security Advisory were discovered internally by Cisco.

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-20110223-telepresence-ctms

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

2011-March-9

Advisory updated to provide new information regarding CSCtj44534 (CVE-2011-0390) and to provide estimated availability for software that will resolve this issue.

Revision 1.0

2011-February-23

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/web/about/security/psirt/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.