Mozilla Firefox unicode data denial of service

firefox-unicode-data-dos (51729) The risk level is classified as MediumMedium Risk

Description:

Mozilla Firefox is vulnerable to a denial of service, caused by a stack-based buffer overflow. By sending an overly long string of unicode data to the document.write method, a remote attacker could overflow a buffer and cause the application to crash.

Note: The details of this vulnerability have been disputed.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.6
  Exploitability: Functional
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Mozilla Firefox (3.5.1 or later), available from the Mozilla Firefox Web site. See References.

References:

  • Mozilla Web site: Firefox.
  • BID-35707: Mozilla Firefox Unicode Data Remote Denial of Service Vulnerability
  • CVE-2009-2479: Mozilla Firefox 3.0.x, 3.5, and 3.5.1 on Windows allows remote attackers to cause a denial of service (uncaught exception and application crash) via a long Unicode string argument to the write method. NOTE: this was originally reported as a stack-based buffer overflow. NOTE: on Linux and Mac OS X, a crash resulting from this long string reportedly occurs in an operating-system library, not in Firefox.
  • OSVDB ID: 55931: Mozilla Firefox Write Method Unicode String Argument Handling Remote Overflow
  • OSVDB ID: 56321: Google Chrome Write Method Unicode String Argument Handling Remote DoS
  • OSVDB ID: 56322: Opera Write Method Unicode String Argument Handling Remote DoS
  • OSVDB ID: 56323: Microsoft IE Write Method Unicode String Argument Handling Remote DoS
  • SECTRACK ID: 1022580: Mozilla Firefox Bug in Processing Unicode Characters Lets Remote Users Deny Service

Platforms Affected:

  • Mozilla Firefox 3.5

Reported:

Jul 15, 2009

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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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