Input validation error in FFmpeg - CVE-2009-4633
Published: October 26, 2011 / Updated: June 8, 2025
Vulnerability identifier: #VU110616
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2009-4633
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
vorbis_dec.c in FFmpeg 0.5 uses an assignment operator when a comparison operator was intended, which might allow remote attackers to cause a denial of service and possibly execute arbitrary code via a crafted file that modifies a loop counter and triggers a heap-based buffer overflow.
Affected software
FFmpeg
Ubuntu
libavcodec1d (Ubuntu package)
libavformat1d (Ubuntu package)
libavformat52 (Ubuntu package)
libavcodec51 (Ubuntu package)
libavcodec52 (Ubuntu package)
Ubuntu
libavcodec1d (Ubuntu package)
libavformat1d (Ubuntu package)
libavformat52 (Ubuntu package)
libavcodec51 (Ubuntu package)
libavcodec52 (Ubuntu package)
How to mitigate CVE-2009-4633
Install update from vendor's website.
libavcodec1d (Ubuntu package) - update to 3:0.cvs20070307-5ubuntu7.4
libavformat1d (Ubuntu package) - update to 3:0.cvs20070307-5ubuntu7.4
libavformat52 (Ubuntu package) - addressed in versions 3:0.svn20080206-12ubuntu3.2, 3:0.svn20090303-1ubuntu6.1, 4:0.5+svn20090706-2ubuntu2.1
libavcodec51 (Ubuntu package) - update to 3:0.svn20080206-12ubuntu3.2
libavcodec52 (Ubuntu package) - addressed in versions 3:0.svn20090303-1ubuntu6.1, 4:0.5+svn20090706-2ubuntu2.1
libavformat1d (Ubuntu package) - update to 3:0.cvs20070307-5ubuntu7.4
libavformat52 (Ubuntu package) - addressed in versions 3:0.svn20080206-12ubuntu3.2, 3:0.svn20090303-1ubuntu6.1, 4:0.5+svn20090706-2ubuntu2.1
libavcodec51 (Ubuntu package) - update to 3:0.svn20080206-12ubuntu3.2
libavcodec52 (Ubuntu package) - addressed in versions 3:0.svn20090303-1ubuntu6.1, 4:0.5+svn20090706-2ubuntu2.1
External References
- http://scarybeastsecurity.blogspot.com/2009/09/patching-ffmpeg-into-shape.html
- http://secunia.com/advisories/36805
- http://secunia.com/advisories/38643
- http://secunia.com/advisories/39482
- http://www.debian.org/security/2010/dsa-2000
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:060
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:061
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:088
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:112
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:114
- http://www.securityfocus.com/bid/36465
- http://www.ubuntu.com/usn/USN-931-1
- http://www.vupen.com/english/advisories/2010/0935
- http://www.vupen.com/english/advisories/2011/1241
- https://roundup.ffmpeg.org/roundup/ffmpeg/issue1240