Sage extension for Mozilla Firefox RSS feed img tag cross-site scripting

sage-img-xss (30179) The risk level is classified as MediumMedium Risk

Description:

Sage extension for Mozilla Firefox is vulnerable to cross-site scripting, caused by improper validation of user-supplied input when processing RSS feeds. A remote attacker could exploit this vulnerability using an HTML img tag to inject malicious script into an RSS feed which would be executed in a victim's Web browser within the security context of the hosting Web site, once the page is viewed. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

*CVSS:

Base Score: 4.2
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 4
  Exploitability: High
  Remediation Level: Unavailable
  Report Confidence: Uncorroborated

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of Sage (1.3.9 or later), available from the Sage Web site. See References.

References:

  • Full-Disclosure Mailing List, Wed Nov 08 2006 - 18:18:57 CST: RSS Injection in Sage part 2.
  • BID-21164: Sage IMG Element Input Validation Vulnerability
  • CVE-2006-6919: Firefox Sage extension 1.3.8 and earlier allows remote attackers to execute arbitrary Javascript in the local context via an RSS feed with an img tag containing the script followed by an extra trailing >, which Sage modifies to close the img element before the malicious script.
  • OSVDB ID: 30268: Sage Extension for Mozilla Firefox Feed img Tag XSS
  • SA22809: Firefox Sage Extension Feed Script Insertion Vulnerabilities
  • VUPEN/ADV-2006-4426: Sage Extension for Firefox img Tag Handling Cross Site Scripting Vulnerability

Platforms Affected:

  • Mozilla Sage Extension for Firefox 1.3.8

Reported:

Nov 09, 2006

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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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