VDB-10152 · OSVDB 96944 · GCVE-100-10152

FFmpeg 2.0 Channel Decoding Offset libavcodec/alac.c alac_decode_frame Remote Code Execution

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in FFmpeg 2.0. Affected is the function alac_decode_frame of the file libavcodec/alac.c of the component Channel Decoding Offset Handler. The manipulation results in an unknown weakness. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability classified as problematic has been found in FFmpeg 2.0 (Multimedia Processing Software). Affected is the function alac_decode_frame of the file libavcodec/alac.c of the component Channel Decoding Offset Handler. The impact remains unknown.

The issue has been introduced in 07/11/2013. The weakness was disclosed 09/03/2013 by Mateusz Jurczyk and Gynvael Coldwind with Google Security Team as alac: Check that the channels fit at the given offset as confirmed git commit (GIT Repository). The advisory is shared for download at git.libav.org. The public release has been coordinated in cooperation with the vendor. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 54 days. During that time the estimated underground price was around $0-$5k.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.libav.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The git commit contains the following remark:

The code tries to decode a number of channels at the offset given by the ff_alac_channel_layout_offsets table. Even if the number of channels decoded so far doesn't exceed the total number of channels, we need to check that we actually can decode that number of channels at this offset as well.

The vulnerability is also documented in the vulnerability database at OSVDB (96944†). Further details are available at twitter.com. The entries VDB-10143, VDB-10144, VDB-10145 and VDB-10146 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

FFmpeg 2.0
Libav 0.8.8/9.8

Productinfo

Type

Multimedia Processing Software

Name

FFmpeg

Version

License

open-source

Website

Product: https://ffmpeg.org/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Remote Code Execution
CWE: Unknown
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.libav.org

Timelineinfo

07/11/2013 🔍
09/03/2013 +54 days 🔍
09/03/2013 +0 days 🔍
09/09/2013 +6 days 🔍
08/21/2017 +1442 days 🔍

Sourcesinfo

Product: ffmpeg.org

Advisory: alac: Check that the channels fit at the given offset
Researcher: Mateusz Jurczyk, Gynvael Coldwind
Organization: Google Security Team
Status: Confirmed
Coordinated: 🔍

GCVE (VulDB): GCVE-100-10152
OSVDB: 96944

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 09/09/2013 14:14
Updated: 08/21/2017 08:44
Changes: 09/09/2013 14:14 (54), 08/21/2017 08:44 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.