Vulnerabilities in FFmpeg Libavcodec Could Allow Arbitrary Code Execution

Executive Summary

Microsoft is providing notification of the discovery and remediation of three vulnerabilities in the FFmpeg codec library software version 0.10 and earlier versions. Microsoft discovered and disclosed the vulnerability under coordinated vulnerability disclosure to the affected vendor, FFmpeg. FFmpeg has remediated the vulnerability in their software.

Vulnerabilities exist in the way that FFmpeg libavcodec parses ASF, QT, and WMV files. These vulnerabilities result in memory corruption issues within libavcodec, allowing arbitrary code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Microsoft Vulnerability Research reported these vulnerabilities to and coordinated with FFmpeg to ensure remediation of these vulnerabilities. The vulnerabilities have been assigned CVE entries CVE-2012-5359, CVE-2012-5360, and CVE-2012-5361, respectively, in the Common Vulnerabilities and Exposures list. For more information, including information about updates from FFmpeg, see the FFmpeg download page.

Mitigating Factors

• The vulnerabilities cannot be exploited automatically through email. For an attack to be successful, a user must open an attachment that is sent in an email message.
• In a web-based attack scenario, an attacker could host a website that contains a specially crafted file that is used to exploit any of these vulnerabilities. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit these vulnerabilities. In all cases, however, an attacker would have no way to force users to visit such websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes users to the attacker’s website, and then convince them to open the specially crafted file.
• An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.