VDB-11402 · OSVDB 100545 · GCVE-100-11402

FFmpeg 2.1 libavcodec/g2meet.c kempf_decode_tile memory corruption

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.
8.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in FFmpeg 2.1. It has been declared as critical. The affected element is the function kempf_decode_tile of the file libavcodec/g2meet.c. Such manipulation leads to memory corruption. No exploit exists. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in FFmpeg 2.1 (Multimedia Processing Software). It has been rated as critical. Affected by this issue is the function kempf_decode_tile of the file libavcodec/g2meet.c. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability.

The issue has been introduced in 10/29/2013. The weakness was disclosed 11/27/2013 by Mateusz Jurczyk and Gynvael Coldwind with Google Security Team as avcodec/g2meet: check available space before copying palette as confirmed git commit (GIT Repository). The advisory is available at git.videolan.org. The public release has been coordinated in cooperation with the vendor. The exploitation is known to be difficult. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 29 days. During that time the estimated underground price was around $0-$5k.

Applying the patch Patchwork avcodec/g2meet: check available space before copying palette is able to eliminate this problem. The bugfix is ready for download at patches.libav.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at OSVDB (100545†). The entries VDB-11404, VDB-11403, VDB-11401 and VDB-11400 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

FFmpeg 2.1
Libav 0.8.9

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: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: Patchwork avcodec/g2meet: check available space before copying palette

Timelineinfo

10/29/2013 🔍
11/27/2013 +29 days 🔍
11/27/2013 +0 days 🔍
12/06/2013 +9 days 🔍
04/17/2019 +1958 days 🔍

Sourcesinfo

Product: ffmpeg.org

Advisory: avcodec/g2meet: check available space before copying palette
Researcher: Mateusz Jurczyk, Gynvael Coldwind
Organization: Google Security Team
Status: Confirmed
Coordinated: 🔍

GCVE (VulDB): GCVE-100-11402
OSVDB: 100545

See also: 🔍

Entryinfo

Created: 12/06/2013 14:25
Updated: 04/17/2019 12:45
Changes: 12/06/2013 14:25 (52), 04/17/2019 12:45 (2)
Complete: 🔍
Committer:
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.