Cisco Security Advisory

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 February 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

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.

• CTMS - CSCtf42008 ( registered customers only) has been assigned the CVE identifier CVE-2011-0383.
  
• CTMS - CSCtf01253 ( registered customers only) has been assigned the CVE identifier CVE-2011-0384.
  

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.

• CTMS - CSCth61065 ( registered customers only) has been assigned the CVE identifier CVE-2011-0385.
  

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.

• CTMS - CSCtd75766 ( registered customers only) has been assigned the CVE identifier CVE-2011-0379.
  

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.

• CTMS - CSCtf97164 ( registered customers only) has been assigned the CVE identifier CVE-2011-0387.
  

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.

• CTMS - CSCtg35825 ( registered customers only) has been assigned the CVE identifier CVE-2011-0388.
  

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.

• CTMS - CSCth60993 ( registered customers only) has been assigned the CVE identifier CVE-2011-0389.
  

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.

• CTMS - CSCtj44534 ( registered customers only) has been assigned the CVE identifier CVE-2011-0390.
  

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 .

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.

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.

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

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

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 Using Third-Party Support Organizations

Customers Without Service Contracts

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.

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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.

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.

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.