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Microsoft AntiXSS Library Sanitization Module Security Bypass Vulnerability

Risk

Medium

Date Discovered

January 10, 2012

Description

Microsoft Anti-Cross Site Scripting (AntiXSS) Library is prone to a security-bypass vulnerability that affects the sanitization module. An attacker can exploit this vulnerability to bypass the filter and conduct cross-site scripting attacks. Successful exploits may allow attackers to execute arbitrary script code and steal cookie-based authentication credentials. Microsoft Anti-Cross Site Scripting Library 3.x and 4.0 are vulnerable.

Technologies Affected

  • Avaya Aura Conferencing 6.0 Standard
  • Avaya CallPilot 4.0
  • Avaya CallPilot 5.0
  • Avaya Communication Server 1000 Telephony Manager 3.0
  • Avaya Communication Server 1000 Telephony Manager 4.0
  • Avaya Meeting Exchange - Client Registration Server
  • Avaya Meeting Exchange - Recording Server
  • Avaya Meeting Exchange - Streaming Server
  • Avaya Meeting Exchange - Web Conferencing Server
  • Avaya Meeting Exchange - Webportal
  • Avaya Meeting Exchange 5.0
  • Avaya Meeting Exchange 5.0 SP1
  • Avaya Meeting Exchange 5.0 SP2
  • Avaya Meeting Exchange 5.0.0.0.52
  • Avaya Meeting Exchange 5.1
  • Avaya Meeting Exchange 5.1 SP1
  • Avaya Meeting Exchange 5.2
  • Avaya Meeting Exchange 5.2 SP1
  • Avaya Meeting Exchange 5.2 SP2
  • Avaya Messaging Application Server 4
  • Avaya Messaging Application Server 5
  • Avaya Messaging Application Server 5.2
  • Microsoft Anti-Cross Site Scripting Library 3
  • Microsoft Anti-Cross Site Scripting Library 4.0

Recommendations

Run all software as a nonprivileged user with minimal access rights.

Ensure that all nonadministrative tasks, such as browsing the web and reading email, are performed as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from a successful exploit.

Do not follow links provided by unknown or untrusted sources.

To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

Set web browser security to disable the execution of script code or active content.

To prevent a successful exploit of script-execution vulnerabilities, disable support for script code and active content within the client browser. Note that this tactic might adversely affect websites that rely on HTML or script code.
Updates are available. Please see the references for more information.

Credits

Adi Cohen of IBM Rational Application Security
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

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