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Debian LTS Advisory ([SECURITY] [DLA 1611-1 and DLA 1611-2] libav security update)

Information

Severity

Severity

High

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.5

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

4 years ago

Modified

Modified

3 years ago

Summary

DLA 1611-1: Several security issues have been corrected in multiple demuxers and decoders of the libav multimedia library. CVE-2014-9317 The decode_ihdr_chunk function in libavcodec/pngdec.c allowed remote attackers to cause a denial of service (out-of-bounds heap access) and possibly had other unspecified impact via an IDAT before an IHDR in a PNG file. The issue got addressed by checking IHDR/IDAT order. CVE-2015-6761 The update_dimensions function in libavcodec/vp8.c in libav relies on a coefficient-partition count during multi-threaded operation, which allowed remote attackers to cause a denial of service (race condition and memory corruption) or possibly have unspecified other impact via a crafted WebM file. This issue has been resolved by using num_coeff_partitions in thread/buffer setup. The variable is not a constant and can lead to race conditions. CVE-2015-6818 The decode_ihdr_chunk function in libavcodec/pngdec.c did not enforce uniqueness of the IHDR (aka image header) chunk in a PNG image, which allowed remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via a crafted image with two or more of these chunks. This has now been fixed by only allowing one IHDR chunk. Multiple IHDR chunks are forbidden in PNG. Description truncated. Please see the references for more information.

Affected Software

Affected Software

libav on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For Debian 8 'Jessie', these problems have been fixed in version 6:11.12-1~deb8u3. We recommend that you upgrade your libav packages.