Cisco Security Advisory

Multiple Vulnerabilities in Cisco TelePresence TC and TE Software

Advisory ID: cisco-sa-20130619-tpc

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130619-tpc

Revision 1.0

For Public Release 2013 June 19 16:00  UTC (GMT)


Summary

Cisco TelePresence TC and TE Software contain two vulnerabilities in the implementation of the Session Initiation Protocol (SIP) that could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition.
Additionally, Cisco TelePresence TC Software contain an adjacent root access vulnerability that could allow an attacker on the same physical or logical Layer-2 network as the affected system to gain an unauthenticated root shell.

Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate the Cisco TelePresence TC and TE Software SIP Denial of Service vulnerabilities are available. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130619-tpc

Affected Products

Vulnerable Products

The following products running a vulnerable version of Cisco TelePresence TC and TE Software are affected by the SIP DoS vulnerabilities:
  • Cisco TelePresence MX Series
  • Cisco TelePresence System EX Series
  • Cisco TelePresence Integrator C Series
  • Cisco TelePresence Profiles Series running
  • Cisco TelePresence Quick Set Series
  • Cisco IP Video Phone E20
The following products running Cisco TelePresence TC Software are affected by the Cisco TelePresence TC Software Adjacent root Access Vulnerability
  • Cisco TelePresence MX Series
  • Cisco TelePresence System EX Series
  • Cisco TelePresence Integrator C Series
  • Cisco TelePresence Profiles Series
  • Cisco TelePresence Quick Set Series
Note: Cisco TelePresence TE Software is not affected by the Cisco TelePresence TC Software Adjacent root Access Vulnerability

Products Confirmed Not Vulnerable

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

Details

Cisco TelePresence TC and TE Software SIP Denial of Service Vulnerabilities

Cisco TelePresence TC and TE Software contains two different vulnerabilities in the implementation of the Session Initiation Protocol (SIP) that could allow an unauthenticated, remote attacker to cause a denial of service condition.
Both vulnerabilities are due to insufficient validation of crafted SIP packets sent to the affected system. An attacker could exploit both vulnerabilities by sending crafted SIP packets to the affected system.

The first vulnerability is documented in Cisco bug ID CSCue01743 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2013-3377.
Successful exploitation of this vulnerability may cause a reload of the affected system.

The second vulnerability is documented in Cisco bug ID CSCuf89557 (registered customers only) and has been assigned CVE ID CVE-2013-3378.
Successful exploitation of this vulnerability may cause the affected system to become unresponsive for a certain amount of time. Repeated exploitation may lead to a denial of service condition.

Cisco TelePresence TC Software Adjacent root Access Vulnerability

A vulnerability in the implementation of firewall rules could allow an unauthenticated, adjacent attacker to gain root shell access to an affected system.

The vulnerability is due to improper implementation of allowed hosts in the firewall rules. An attacker could exploit this vulnerability by connecting to the management IP address of the affected system. The attacker would need to be logically or physically adjacent to exploit this vulnerability. An exploit could allow the attacker to gain root access to the shell.

This vulnerability is documented in Cisco bug ID CSCts37781 (registered customers only) and has been assigned CVE ID CVE-2013-3379.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

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

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

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

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

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



CSCue01743 - Cisco TelePresence TC and TE Software SIP Denial of Service Vulnerability

Calculate the environmental score of CSCue01743

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




CSCuf89557 - Cisco TelePresence TC and TE Software SIP Denial of Service Vulnerability

Calculate the environmental score of CSCuf89557

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




CSCts37781 - Cisco TelePresence TC Software Adjacent root Access Vulnerability

Calculate the environmental score of CSCts37781

CVSS Base Score - 8.3

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Adjacent Network

Low

None

Complete

Complete

Complete

CVSS Temporal Score - 6.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of the Cisco TelePresence TC and TE Software SIP DoS vulnerabilities may cause the affected system to become unresponsive or reload.

Successful exploitation of the Cisco TelePresence TC Software Adjacent root Access Vulnerability  could allow an attacker on the same physical or logical Layer-2 network as the affected system to gain an unauthenticated root shell. 

Software Versions and Fixes

Cisco TelePresence TC and TE Software SIP Denial of Service Vulnerabilities

The following table indicates the fixed releases for Cisco TelePresence TC and TE Software for the vulnerability identified by Cisco bug ID CSCue01743 and CVE ID CVE-2013-3377 for each of the affected products:



Products
Affected Releases
Resolved In
 Cisco TelePresence MX Series  TC5.x and earlier
 TC5.1.7 or later
 Cisco TelePresence System EX Series  TC5.x and earlier  TC5.1.7 or later
 Cisco TelePresence System EX Series  TE6.0  TC6.1 or later
 Cisco TelePresence Integrator C Series  TC5.x and earlier  TC5.1.7 or later
 Cisco TelePresence Profiles Series  TC5.x and earlier  TC5.1.7 or later
 Cisco TelePresence Quick Set Series  TC5.x and earlier  TC5.1.7 or later
 Cisco IP Video Phone E20
 TE4.x and earlier
 TE4.1.3

The following table provides information about the fixed releases for Cisco TelePresence TC and TE Software referring to the vulnerability identified by Cisco bug ID CSCuf89557 and CVE ID CVE-2013-3378 for each of the affected products:

Products
Affected Releases
Resolved In
 Cisco TelePresence MX Series  TC6.x and earlier
 TC6.1 or later
 Cisco TelePresence System EX Series  TC6.x and earlier  TC6.1 or later
 Cisco TelePresence System EX Series  TE6.0  TC6.1 or later
 Cisco TelePresence Integrator C Series  TC6.x and earlier  TC6.1 or later
 Cisco TelePresence Profiles Series  TC6.x and earlier  TC6.1 or later
 Cisco TelePresence Quick Set Series  TC6.x and earlier  TC6.1 or later
 Cisco IP Video Phone E20
 TE4.x and earlier
 TE4.1.3


Cisco TelePresence TC Software Adjacent root Access Vulnerability


The table below gives information about the fixed releases for the Cisco TelePresence TC Software Adjacent root Access Vulnerability for each of the affected products:

Products
Affected Releases
Resolved In
 Cisco TelePresence MX Series  TC4.1 and earlier
 TC4.2 or later
 Cisco TelePresence System EX Series  TC4.1 and earlier  TC4.2 or later
 Cisco TelePresence Integrator C Series  TC4.1 and earlier  TC4.2 or later
 Cisco TelePresence Profiles Series  TC4.1 and earlier  TC4.2 or later
 Cisco TelePresence Quick Set Series  TC4.1 and earlier  TC4.2 or later

Recommended Releases

The following table provides information about recommended releases for Cisco TelePresence TC and TE Software that resolve all the vulnerabilities described in this advisory:

Products
Recommended Release
 Cisco TelePresence MX Series  TC6.1 or later
 Cisco TelePresence System EX Series  TC6.1 or later
 Cisco TelePresence System EX Series  TC6.1 or later
 Cisco Telepresence Integrator C Series  TC6.1 or later
 Cisco TelePresence Profiles Series  TC6.1 or later
 Cisco TelePresence Quick Set Series  TC6.1 or later
 Cisco IP Video Phone E20
 TE4.1.3

Note: Cisco TelePresence TE Software version 4.1.3 for Cisco IP Video Phone E20 will be available on June 30, 2013.

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.


Workarounds

Cisco TelePresence TC and TE Software SIP Denial of Service Vulnerabilities

If SIP it is not in use, a possible workaround for these vulnerabilities can be achieved by disabling the SIP service: set the NetworkServices SIP Mode to Off by issuing the following xCommand:
xConfiguration NetworkServices SIP Mode: Off
Alternatively, administrators can use the web interface to disable the SIP service: navigate to Configuration > Advanced Configuration > Network Services and set the SIP mode to Off.

Cisco TelePresence TC Software Adjacent root Access Vulnerability

There is no workaround that mitigates this vulnerability.

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

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 with Cisco products that 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 organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):

  • +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 the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

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

Exploitation and Public Announcements

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.

The vulnerability identified by Cisco bug ID CSCue01743 and CVE ID CVE-2013-3377 was discovered during internal tests.

The vulnerability identified by Cisco bug ID CSCuf89557 and CVE ID CVE-2013-3377 was reported to Cisco by Knud from nSense.

The Cisco TelePresence TC Software Adjacent root Access Vulnerability was discovered during internal tests.

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 Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130619-tpc

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

  • 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

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.


Revision History

Revision 1.0 2013-June-19 Initial public release

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.


Download this document (PDF)
View Printable Version