Unspecified vulnerability in the ac3_decode_frame function in libavcodec/ac3dec.c in FFmpeg before 0.11 and Libav 0.8.x before 0.8.4 has unknown impact and attack vectors, related to the "number of output channels" and "out of array writes."

The remote host is affected by the vulnerability described in GLSA-201406-28 (Libav: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Libav. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could entice a user to open a specially crafted media       file in an application linked against Libav, possibly resulting in       execution of arbitrary code with the privileges of the application or a       Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote host is affected by the vulnerability described in GLSA-201310-12 (FFmpeg: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in FFmpeg. Please review       the CVE identifiers and FFmpeg changelogs referenced below for details.
  Impact :

    A remote attacker could entice a user to open a specially crafted media       file, possibly leading to the execution of arbitrary code with the       privileges of the user running the application or a Denial of Service.
  Workaround :

    There is no known workaround at this time.

Updated ffmpeg packages fix security vulnerabilities :

h264: Add check for invalid chroma_format_idc (CVE-2012-0851)

h263dec: Disallow width/height changing with frame threads (CVE-2011-3937)

vc1dec: check that coded slice positions and interlacing match. This fixes out of array writes (CVE-2012-2796)

alsdec: fix number of decoded samples in first sub-block in BGMC mode (CVE-2012-2790)

cavsdec: check for changing w/h. Our decoder does not support changing w/h (CVE-2012-2777, CVE-2012-2784)

indeo4: update AVCodecContext width/height on size change (CVE-2012-2787)

avidec: use actually read size instead of requested size (CVE-2012-2788)

wmaprodec: check num_vec_coeffs for validity (CVE-2012-2789)

lagarith: check count before writing zeros (CVE-2012-2793)

indeo3: fix out of cell write (CVE-2012-2776)

indeo5: check tile size in decode_mb_info\(\). This prevents writing into a too small array if some parameters changed without the tile being reallocated (CVE-2012-2794)

indeo5dec: Make sure we have had a valid gop header. This prevents decoding happening on a half initialized context (CVE-2012-2779)

indeo4/5: check empty tile size in decode_mb_info\(\). This prevents writing into a too small array if some parameters changed without the tile being reallocated (CVE-2012-2800)

dfa: improve boundary checks in decode_dds1\(\) (CVE-2012-2798)

dfa: check that the caller set width/height properly (CVE-2012-2786)

avsdec: Set dimensions instead of relying on the demuxer. The decode function assumes that the video will have those dimensions (CVE-2012-2801)

ac3dec: ensure get_buffer\(\) gets a buffer for the correct number of channels (CVE-2012-2802)

rv34: error out on size changes with frame threading (CVE-2012-2772)

alsdec: check opt_order. Fixes out of array write in quant_cof. Also make sure no invalid opt_order stays in the context (CVE-2012-2775)

This updates ffmpeg to version 0.10.6 which contains the security fixes above as well as other bug fixes.

It was discovered that Libav incorrectly handled certain malformed media files. If a user were tricked into opening a crafted media file, an attacker could cause a denial of service via application crash, or possibly execute arbitrary code with the privileges of the user invoking the program.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
76272	GLSA-201406-28 : Libav: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
70647	GLSA-201310-12 : FFmpeg: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
66093	Mandriva Linux Security Advisory : ffmpeg (MDVSA-2013:079)	Nessus	Mandriva Local Security Checks	critical
64283	Ubuntu 11.10 / 12.04 LTS / 12.10 : libav vulnerabilities (USN-1705-1)	Nessus	Ubuntu Local Security Checks	critical
62900	Ubuntu 12.04 LTS / 12.10 : libav vulnerabilities (USN-1630-1)	Nessus	Ubuntu Local Security Checks	critical

Detections

Analytics

CVE-2012-2802

critical

Tenable Plugins

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critical

critical

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critical