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Cisco Security Advisory

XSS and SQL Injection in Cisco CallManager/Unified Communications Manager Logon Page

Advisory ID: cisco-sa-20070829-ccm

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070829-ccm

Revision 1.2

For Public Release 2007 August 29 16:00  UTC (GMT)

Related Resources:


Summary

Cisco CallManager and Unified Communications Manager are vulnerable to cross-site Scripting (XSS) and SQL Injection attacks in the lang variable of the admin and user logon pages. A successful attack may allow an attacker to run JavaScript on computer systems connecting to CallManager or Unified Communications Manager servers, and has the potential to disclose information within the database.

Cisco has made free software available to address these vulnerabilities for affected customers.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070829-ccm.

Affected Products

Vulnerable Products

Cisco CallManager and Unified Communications Manager versions prior to the following are affected by these vulnerabilities:

  • 3.3(5)sr2b
  • 4.1(3)sr5
  • 4.2(3)sr2
  • 4.3(1)sr1

The software version of a CallManager or Unified Communications Manager system can be determined by navigating to Show > Software via the administration interface.

For Unified Communications Manager version 5.0, the software version can also be determined by running the command show version active in the Command Line Interface (CLI).

For CallManager and Unified Communications Manager version 3.x and 4.x systems, the software version can be determined by navigating to Help > About Cisco Unified CallManager and selecting the Details button via the administration interface.

Note: Cisco Unified CallManager versions 4.3, 5.1 and 6.0 have been renamed to Cisco Unified Communications Manager. Software versions 3.3, 4.0, 4.1, 4.2 and 5.0 retain the Cisco Unified CallManager name.

Products Confirmed Not Vulnerable

No other Cisco products are known to be affected by this vulnerability.

No other versions of CallManager or Unified Communications Manager are vulnerable.

Details

Cisco Unified CallManager/Communications Manager (CUCM) is the call processing component of the Cisco IP telephony solution which extends enterprise telephony features and functions to packet telephony network devices such as IP phones, media processing devices, voice-over-IP (VoIP) gateways, and multimedia applications.

The cross-site scripting vulnerability and the SQL injection vulnerability are triggered when a specially crafted value is entered in the lang variable of either the admin or user logon pages. Attacks against these vulnerabilities are conducted through the web interface and use the http or https protocol. In the case of the cross-site scripting vulnerability, the malicious value includes scripting code enclosed by the <script> and </script> tags. In the case of the SQL injection vulnerability, the value terminates the SQL call and completes a call to the back-end database.

An attacker must be able to convince a user into following a specially crafted URL in order to successfully exploit the cross-site scripting vulnerability.

The cross-site scripting vulnerability is documented as bug ID CSCsi10728 ( registered customers only) .

The SQL injection vulnerability is documented as bug ID CSCsi64265 ( registered customers only) .

Vulnerability Scoring Details

Cisco is providing 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.

Cisco will provide a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco PSIRT will set the bias in all cases to normal. Customers are encouraged to apply the bias parameter when determining the environmental impact of a particular vulnerability.

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

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

XSS in Cisco CallManager User Logon and Admin Page

Calculate the environmental score of CSCsi10728

CVSS Base Score - 4.3

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

Partial

None

None

CVSS Temporal Score - 3.6

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

SQL Injection in Cisco CallManager User Logon and Admin Page

Calculate the environmental score of CSCsi64265

CVSS Base Score - 5

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Partial

None

None

CVSS Temporal Score - 4.1

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

An attacker could exploit the cross-site scripting vulnerability to steal account credentials or run unauthorized JavaScript on the client system.

An attacker could exploit the SQL injection vulnerability to read a single value from the database. Several successful attacks could disclose information about the database, information such as user names and passwords, and information from call records such as the time calls are placed and the numbers dialed. This vulnerability cannot be used to alter or delete call record information from the database.

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 be certain that the devices scheduled for upgrade contain sufficient memory and that current hardware and software configurations will continue to be properly supported by the new release. If the information is not clear, contact the Cisco Technical Assistance Center ("TAC") or your contracted maintenance provider for assistance.

Version

Fixed Release

Download Location

3.3

3.3(5)sr2b

http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-33?psrtdcat20e2 ( registered customers only)

4.1

4.1(3)sr5

http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-41?psrtdcat20e2 ( registered customers only)

4.2

4.2(3)sr2

http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-42?psrtdcat20e2 ( registered customers only)

4.3

4.3(1)sr1

http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-43?psrtdcat20e2 ( registered customers only)


Workarounds

There are no workarounds for these vulnerabilities.

Cross-site scripting, also known as XSS, is a flaw within web applications that enables malicious users, vulnerable websites, or owners of malicious websites to send malicious code to the browsers of unsuspecting users. The malicious code is usually in the form of a script embedded in the URL of a link or the code may be stored on the vulnerable server or malicious website. The browser will execute the malicious script because the web content is assumed to be from a trusted site and the browser does not have a way to validate the URL or HTML content. A main source of XSS attacks is websites that do not properly validate user-submitted content for dynamically generated web pages.

Because of the nature of XSS vulnerabilities, network mitigation techniques are generally ineffective. To reduce the risk of users becoming victims of XSS attacks, users should be educated about the URL verification limitations of browsers. Countermeasures should also be implemented in the browser through scripting controls. Scripting controls do allow the ability to define policies to restrict code execution.

For additional information on XSS attacks and the methods used to exploit these vulnerabilities, please refer to the Cisco Applied Intelligence Response "Understanding Cross-Site Scripting (XSS) Threat Vectors", available at: http://www.cisco.com/warp/public/707/cisco-air-20060922-understanding-xss.shtml.

Obtaining Fixed Software

Cisco will make free software available to address this vulnerability for affected customers. This advisory will be updated as fixed software becomes available. 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/public/sw-license-agreement.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact either "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 agreement 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 who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their 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

Have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special 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 malicious use of the vulnerability described in this advisory; however, it has been discussed in public announcements. References include:

http://packetstormsecurity.org/0708-exploits/cisco-sql.txt leavingcisco.com.

This vulnerability was reported to Cisco independently by Gama SEC and Elliot Kendall from Brandeis University. We would like to thank Gama SEC and Elliot Kendall for bringing this issue to our attention and for working with us toward coordinated disclosure of the issue. We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist in product reports.

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-20070829-ccm

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-teams@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 1.2

2008-April-25

Updated links to the CVSS scores for CSCsi10728 and CSCsi64265.

Revision 1.1

2007-August-31

Under Exploitation and Public Announcements, changed verbiage and added a link.

Revision 1.0

2007-August-29

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.


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