Sage extension for Firefox description cross-site scripting

sage-description-xss (54396) The risk level is classified as MediumMedium Risk

Description:

The Sage extension for Firefox is vulnerable to cross-site scripting, caused by improper validation of user-supplied input. A remote attacker could exploit this vulnerability using the description tag within RSS feeds to inject malicious script into a Web page which would be executed in a victim's Web browser in the "chrome:" context, if the attacker could persuade the victim to load a specially-crafted RSS feed. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 4.1
  Exploitability: High
  Remediation Level: Unavailable
  Report Confidence: Uncorroborated

Consequences:

Gain Access

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • Help Net Security Web Site: Zero-day vulnerabilities in Firefox extensions discovered.
  • Sage Web site: Sage: a feed reader for Firefox.
  • BID-37120: Mozilla Firefox Sage Extension RSS Feeds Cross Domain Scripting Vulnerability
  • CVE-2009-4102: Sage 1.4.3 and earlier extension for Firefox performs certain operations with chrome privileges, which allows remote attackers to execute arbitrary commands and perform cross-domain scripting attacks via the description tag of an RSS feed.
  • DSA-1951: firefox-sage -- insufficient input sanitising
  • OSVDB ID: 60529: Sage Extension for Firefox RSS Feed chrome: Cross-context Arbitrary Code Execution
  • OSVDB ID: 75341: Sage Extension for Mozilla Firefox Crafted Feed XSS
  • SA37466: Firefox Sage Extension Cross-Context Scripting Vulnerability
  • VUPEN/ADV-2009-3324: Sage Extension for Firefox RSS Feed Script Injection Vulnerability

Platforms Affected:

  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • Mozilla Sage Extension for Firefox 1.4.3

Reported:

Nov 24, 2009

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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