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Cisco Security Response

Cisco Unified MeetingPlace XSS Vulnerability

Document ID: 570

http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20070808-mp

Revision 1.3

Last Updated on 2010  July  8 16 : 00  UTC (GMT)

For Public Release 2007  August  8 16 : 00  UTC (GMT)


Contents

Response
Additional Information
Status of this Notice: Final
Revision History
Cisco Security Procedures

Cisco Response

This is the Cisco PSIRT response to an issue discovered and reported to Cisco by Roger Jefferiss and Rob Pope of SecureTest Ltd, UK regarding cross-site scripting (XSS) vulnerability in Cisco Unified MeetingPlace Web Conferencing.

The original report is available at the following link: http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/056073.html.

We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist in product reports.

This vulnerability is documented in Cisco bug ID CSCsi33940 (registered customers only) .

Since publication of this advisory, Cisco has received several support calls related to security scanners still flagging the STPL or FTPL parameter as vulnerable to XSS attacks. Cisco has addressed this in Cisco bug ID CSCtd69750.

This Cisco Security Response is posted at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20070808-mp.

Additional Information

Cisco Unified MeetingPlace Web Conferencing (MP) provides real-time collaboration functionality to an organization's intranet and extranet, and integrates Cisco Unified MeetingPlace with a web server, thus providing users with a browser-based interface. Web Conferencing enables users to schedule and attend conferences, access meeting materials, and collaborate on documents from common web browsers.

Success Template (STPL) and Failure Template (FTPL) parameters are used to specify the return template of a user request. These should correspond to an actual template file that resides on the MP server's file system.

When MP servers running software versions 5.3.235.0 and earlier receive invalid input for the STPL or FTPL parameters, they return a HTML error template page. The returned HTML page contains the original inputted URL.

When this reflected XSS vulnerability is exploited, malicious code or a script is embedded within the URL and associated with either the STPL or FTPL parameter. 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. An unsuspecting user is enticed to follow a malicious link to a vulnerable MP server that injects (reflects) the malicious code back to the user's browser as the MP server does not have the requested template file associated with the STPL or FTPL parameter. Therefore, the MP server responds with the template used for error pages, which includes the requested URL with the malicious code, thus causing the target user's browser to execute it.

Software versions 5.3.333.0 and later of Cisco Unified MeetingPlace Web Conferencing will return an XML message with an embedded error code when receiving invalid input for the STPL and FTPL parameters. The error message is properly and securely formatted per the XML CDATA specification.

All 5.4 and 6.0 versions of Cisco Unified MeetingPlace Web Conferencing are unaffected by this vulnerability.

To determine the software version of a Cisco Unified MeetingPlace Web Conferencing server, access the MP server home page via an HTTP session; the version information is provided at the bottom of the home page. The following output shows an example of the text viewable when accessing the home page of a MeetingPlace Web Conferencing server running software version 5.3.447.4:

Copyright © 1992-2007 Cisco Systems, Inc. All Rights Reserved. 
Version: 5.3.447.4

Workarounds

All software releases of Cisco Unified MeetingPlace Web Conferencing are affected prior to the listed Fixed Software versions. There are no known workarounds for this vulnerability.

Cisco recommends upgrading to a fixed release of Cisco Unified MeetingPlace Web Conferencing software.

Cisco Bug ID

Fixed Software Version

CSCsi33940

5.3.333.0 and later.

All 5.4 and 6.0 versions.

CSCtd69750

6.0.639.4 and later.

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," which is available at the following link:

http://www.cisco.com/warp/public/707/cisco-air-20060922-understanding-xss.shtml

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.


Revision History

Revision 1.3

2010-July-08

Added Cisco bug ID CSCtd69750 and associated software fixes.

Revision 1.2

2010-June-24

Added Cisco bug ID CSCtd69750 to track issue of security scanners still flagging the STPL or FTPL parameter as vulnerable to XSS attacks.

Revision 1.1

2007-August-15

Revised Workarounds section and added recommended software.

Revision 1.0

2007-August-08

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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