Microsoft Vulnerability Research Advisory MSVR11-011
Vulnerability in FFmpeg Matroska Format Decoder Could Allow Remote Code Execution
Published: September 20, 2011
Microsoft is providing notification of the discovery and remediation of a vulnerability affecting FFmpeg version 0.8.0 and earlier. Microsoft discovered and disclosed the vulnerability under coordinated vulnerability disclosure to the affected vendor, FFmpeg. FFmpeg has remediated the vulnerability in their software.
A vulnerability exists in the way that the Matroska format decoder included with FFmpeg handles allocation of memory when parsing specially crafted files. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. If a 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 this issue to and coordinated with FFmpeg to ensure remediation of this issue. The vulnerability has been assigned the entry, CVE-2011-3504, in the Common Vulnerabilities and Exposures list. For more information, including information about updates from FFmpeg, see the FFmpeg download page.
- The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.
- In a Web-based attack scenario, an attacker could host a Web site that contains a specially crafted file that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted file.
- An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on 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.
Purpose and Recommendation
Purpose of Advisory: To notify users of a vulnerability and its remediation.
Advisory Status: Advisory published.
Recommendation: Review the Suggested Actions section and configure as appropriate.
For more information about this issue, see the following references:
|Common Vulnerabilities and Exposures||CVE-2011-3504|
Affected and Non-Affected Software
This advisory discusses the following software:
Frequently Asked Questions
What is the scope of this advisory?
This advisory is part of a coordinated release with affected vendors to inform customers of a security issue that may affect their systems.
Is this a security vulnerability that requires Microsoft to issue a security update?
No. This vulnerability has been fixed via an update from the affected third-party vendors. The update remediates the software listed in the table, Affected Software.
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on 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.
What causes the vulnerability?
The vulnerability exists in the way that FFmpeg handles specially crafted Matroska formatted files.
What might an attacker use this vulnerability to do?
An attacker who successfully exploited this vulnerability could gain the same user rights as a logged-on user. If the 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.
How could an attacker exploit the vulnerability?
An attacker could exploit this vulnerability by tricking a user into opening a specially crafted file with an affected version of FFmpeg. Typically these specially crafted files are delivered via social engineering techniques in e-mail, instant messaging, or via download links on Web sites. This vulnerability cannot be exploited without user interaction.
Download and use FFmpeg version 0.8.3 from FFmpeg.
Microsoft thanks the following:
- Jeong Wook (Matt) Oh of Microsoft Malware Protection Center (MMPC) and Michael Niedermayer of FFmpeg for working toward a resolution.
The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
- V1.0 (September 20, 2011): Advisory published.
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