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Cisco Security Advisory

Multiple Vulnerabilities in Cisco TelePresence Endpoint Devices

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

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

Revision 1.0

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

Related Resources:

View related Applied Mitigation Bulletin

Summary

Multiple vulnerabilities exist in the Cisco TelePresence solution; each component of the solution is addressed independently in its own advisory. This advisory addresses Cisco TelePresence endpoint devices and details the following vulnerabilities:

  • Unauthenticated Common Gateway Interface (CGI) Access
  • CGI Command Injection
  • TFTP Information Disclosure
  • Malicious IP Address Injection
  • XML-Remote Procedure Call (RPC) Command Injection
  • Cisco Discovery Protocol Remote Code Execution

Duplicate Issue Identification in Other Cisco TelePresence Advisories

The Cisco Discovery Protocol Remote Code Execution vulnerability affects Cisco TelePresence endpoint devices, Manager, Multipoint Switch, and Recording Server. The defect that is 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)

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

Affected Products

One or more of these vulnerabilities affect all Cisco TelePresence endpoint systems that are running a release of Cisco TelePresence software prior to 1.7.1.

The following table provides information that pertains to affected software releases:

Description

Cisco Bug ID

Affected Software Releases

Unauthenticated CGI Access

CSCtb31640

1.2.x, 1.3.x, 1.4.x, 1.5.x

CGI Command Injection

CSCtb31685

1.2.x, 1.3.x, 1.4.x, 1.5.x

CGI Command Injection

CSCtb31659

1.2.x, 1.3.x, 1.4.x, 1.5.x

CGI Command Injection

CSCth24671

1.2.x, 1.3.x, 1.4.x, 1.5.x, 1.6.x

TFTP Information Disclosure

CSCte43876

1.2.x, 1.3.x, 1.4.x, 1.5.x, 1.6.0, 1.6.1

Malicious IP Address Injection

CSCth03605

1.2.x, 1.3.x, 1.4.x, 1.5.x, 1.6.x

XML-RPC Command Injection

CSCtb52587

1.2.x, 1.3.x, 1.4.x, 1.5.x

Cisco Discovery Protocol Remote Code Execution

CSCtd75754

1.2.x, 1.3.x, 1.4.x, 1.5.x, 1.6.x

Vulnerable Products

The following Cisco TelePresence endpoint systems that are running an affected version of software are vulnerable: Cisco TelePresence System 500 Series, 1300 Series, 3000 Series, and 3200 Series and Cisco TelePresence System 1000 and 1100.

To determine the current version of software that is running on the endpoint, access the device via SSH and issue the show version command. The output should resemble the following example. The version that is active on the system will be marked by an asterisk character (*).

admin: show version
primary
   Factory   CTS 1.4.2(2194) 
  *Slot 1    CTS 1.7.1(4750) P1 
   Slot 2    CTS 1.6.2(2835) P1 
admin:

In the preceding example, the system has versions 1.4.2, 1.6.2, and 1.7.1 loaded on the device and version 1.7.1 is currently active. A device is affected only by vulnerabilities that are present 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 affected software versions that are running on Cisco TelePresence endpoint devices.

Unauthenticated CGI Access

Multiple CGI command injection vulnerabilities exist in Cisco TelePresence endpoint devices that could allow a remote, unauthenticated attacker to execute arbitrary commands with elevated privileges. To exploit these vulnerabilities, an attacker must submit a malformed request to an affected device via TCP port 8082.

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

  • Cisco TelePresence endpoint - CSCtb31640 ( registered customers only) has been assigned the CVE identifier CVE-2011-0372

CGI Command Injection

Multiple CGI command injection vulnerabilities exist in Cisco TelePresence endpoint devices that could allow a remote, authenticated attacker to execute arbitrary commands with elevated privileges. To exploit these vulnerabilities, an attacker must submit a malformed request to an affected device via TCP port 443.

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

  • Cisco TelePresence endpoint - CSCtb31685 ( registered customers only) has been assigned the CVE identifier CVE-2011-0373.
  • Cisco TelePresence endpoint - CSCtb31659 ( registered customers only) has been assigned the CVE identifier CVE-2011-0374.
  • Cisco TelePresence endpoint - CSCth24671 ( registered customers only) has been assigned the CVE identifier CVE-2011-0375.

TFTP Information Disclosure

An information disclosure vulnerability exists within Cisco TelePresence endpoint devices that could allow an unauthenticated, remote attacker to retrieve sensitive authentication and configuration information. The attacker would need to have the ability to submit a TFTP GET request via UDP port 69 to the affected device.

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. However, due to the fact that this is an information disclosure issue the attacker would need to supply a valid return IP address to retrieve the information.

  • Cisco TelePresence endpoint - CSCte43876 ( registered customers only) has been assigned the CVE identifier CVE-2011-0376.

Malicious IP Address Injection

A denial of service vulnerability exists within Cisco TelePresence endpoint devices that could allow a remote, unauthenticated attacker to cause a denial of service condition. An attacker with the ability to impersonate a Cisco TelePresence Manager system could remotely inject an invalid IP address into a configuration file that could cause a critical service on the device to crash. An endpoint affected by this issue will remain unusable until it has been manually restored to a known good state. Restoration of service may require an administrator to reload software on the affected device. The attacker would need the ability to submit a malformed SOAP request to an affected device via TCP port 8081 or TCP port 9501.

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

  • Cisco TelePresence endpoint - CSCth03605 ( registered customers only) has been assigned the CVE identifier CVE-2011-0377.

XML-RPC Command Injection

An XML-RPC command injection vulnerability exists with Cisco TelePresence endpoint devices. This issue could allow an unauthenticated attacker with access to the broadcast domain of the affected device to execute arbitrary commands with elevated privileges. The attacker would need the ability to submit a request to an affected system via TCP port 61441 or TCP port 61445.

An attacker must perform a three-way TCP handshake and establish a valid session to exploit this vulnerability. The issue may require that the attacker perform an ARP spoofing or other form of impersonation attack.

  • Cisco TelePresence endpoint - CSCtb52587 ( registered customers only) has been assigned the CVE identifier CVE-2011-0378.

Cisco Discovery Protocol Remote Code Execution

A remote code execution vulnerability exists in Cisco TelePresence endpoint devices. This vulnerability could allow an unauthenticated, adjacent attacker to trigger a buffer overflow condition. To exploit this vulnerability, the attacker must submit a malicious Cisco Discovery Protocol packet to an affected system.

Because Cisco Discovery Protocol functions at the Data-Link (L2) layer, an attacker must submit an Ethernet frame directly to an affected device. This scenario may be possible when affected systems are part of a bridged network or connected to a nonpartitioned device such as a network hub.

  • Cisco TelePresence endpoint - CSCtd75754 ( registered customers only) has been assigned the CVE identifier CVE-2011-0379.

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 Cisco 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 .

CSCtb31640 - Unauthenticated CGI Access

Calculate the environmental score of CSCtb31640

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

CSCtb31685 - CGI Command Injection

Calculate the environmental score of CSCtb31685

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtb31659 - CGI Command Injection

Calculate the environmental score of CSCtb31659

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCth24671 - CGI Command Injection

Calculate the environmental score of CSCth24671

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCte43876 - TFTP Information Disclosure

Calculate the environmental score of CSCte43876

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

CSCth03605 - Malicious IP Address Injection

Calculate the environmental score of CSCth03605

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

CSCtb52587 - XML-RPC Command Injection

Calculate the environmental score of CSCtb52587

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

CSCtd75754 - Cisco Discovery Protocol Remote Code Execution

Calculate the environmental score of CSCtd75754

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

Impact

Successful exploitation of the Unauthenticated CGI Access (CSCtb31640) vulnerability could allow an unauthenticated, remote attacker to take complete control of an affected device or system.

Successful exploitation of the CGI Command Injection (CSCtb31659, CSCtb31685, and CSCth24672) vulnerabilities could allow an authenticated, remote attacker to take complete control of an affected device or system.

Successful exploitation of the TFTP Information Disclosure (CSCte43876) vulnerability could allow an unauthenticated, remote attacker to take complete control of an affected system.

Successful exploitation of the Malicious IP Address Injection (CSCth03605) vulnerability could allow an unauthenticated, remote attacker to cause a persistent denial of service condition on an affected system.

Successful exploitation of the XML-RPC Command Injection (CSCtb52587) vulnerability could allow an unauthenticated, adjacent attacker to take complete control of an affected system.

Successful exploitation of the Cisco Discovery Protocol Remote Code Execution (CSCtd75754) vulnerability could allow an unauthenticated, adjacent attacker to take complete control of an affected system.

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 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 CGI Access

CSCtb31640

Cisco TelePresence endpoint

1.6.0

1.7.1

CGI Command Injection

CSCtb31685

Cisco TelePresence endpoint

1.6.0

1.7.1

CSCtb31659

Cisco TelePresence endpoint

1.6.0

1.7.1

CSCth24671

Cisco TelePresence endpoint

1.7.0

1.7.1

TFTP Information Disclosure

CSCte43876

Cisco TelePresence endpoint

1.6.2

1.7.1

Malicous IP Address Injection

CSCth03605

Cisco TelePresence endpoint

1.6.0

1.7.1

XML-RPC Command Injection

CSCtb52587

Cisco TelePresence endpoint

1.6.0

1.7.1

Cisco Discovery Protocol Remote Code Execution

CSCtd75754

Cisco TelePresence endpoint

1.7.0

1.7.1

Cisco recommends that customers upgrade all components of the Cisco TelePresence solution to 1.7.1 or later.


Workarounds

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

Additional mitigations that can be deployed on Cisco devices in 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 that are described in this advisory.

All vulnerabilities identified in 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-cts

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 1.0

2011-February-23

Intial 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.


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