The allocate_buffers function in libavcodec/alac.c in FFmpeg before 2.7.2 does not initialize certain context data, which allows remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted Apple Lossless Audio Codec (ALAC) data.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The allocate_buffers function in libavcodec/alac.c in FFmpeg before 2.7.2 does not initialize certain     context data, which allows remote attackers to cause a denial of service (segmentation violation) or     possibly have unspecified other impact via crafted Apple Lossless Audio Codec (ALAC) data. (CVE-2015-6823)

Note that Nessus relies on the presence of the package as reported by the vendor.

Two more security issues have been corrected in the libav multimedia library. This is a follow-up announcement for DLA-1611-1.

CVE-2015-6823

The allocate_buffers function in libavcodec/alac.c did not initialize certain context data, which allowed remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted Apple Lossless Audio Codec (ALAC) data. This issues has now been addressed by clearing pointers in avcodec/alac.c's allocate_buffers().

Other than stated in debian/changelog of upload 6:11.12-1~deb8u2, this issue only now got fixed with upload of 6:11.12-1~deb8u3.

CVE-2015-6824

The sws_init_context function in libswscale/utils.c did not initialize certain pixbuf data structures, which allowed remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted video data. In swscale/utils.c now these pix buffers get cleared which fixes use of uninitialized memory.

Other than stated in debian/changelog of upload 6:11.12-1~deb8u2, this issue only now got fixed with upload of 6:11.12-1~deb8u3.

For Debian 8 'Jessie', these problems have been fixed in version 6:11.12-1~deb8u3.

We recommend that you upgrade your libav packages.

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

NVD reports :

The decode_ihdr_chunk function in libavcodec/pngdec.c in FFmpeg before 2.7.2 does not enforce uniqueness of the IHDR (aka image header) chunk in a PNG image, which allows 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.

Multiple integer underflows in the ff_mjpeg_decode_frame function in libavcodec/mjpegdec.c in FFmpeg before 2.7.2 allow remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted MJPEG data.

The ff_sbr_apply function in libavcodec/aacsbr.c in FFmpeg before 2.7.2 does not check for a matching AAC frame syntax element before proceeding with Spectral Band Replication calculations, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted AAC data.

The ff_mpv_common_init function in libavcodec/mpegvideo.c in FFmpeg before 2.7.2 does not properly maintain the encoding context, which allows remote attackers to cause a denial of service (invalid pointer access) or possibly have unspecified other impact via crafted MPEG data.

The destroy_buffers function in libavcodec/sanm.c in FFmpeg before 2.7.2 does not properly maintain height and width values in the video context, which allows remote attackers to cause a denial of service (segmentation violation and application crash) or possibly have unspecified other impact via crafted LucasArts Smush video data.

The allocate_buffers function in libavcodec/alac.c in FFmpeg before 2.7.2 does not initialize certain context data, which allows remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted Apple Lossless Audio Codec (ALAC) data.

The sws_init_context function in libswscale/utils.c in FFmpeg before 2.7.2 does not initialize certain pixbuf data structures, which allows remote attackers to cause a denial of service (segmentation violation) or possibly have unspecified other impact via crafted video data.

The ff_frame_thread_init function in libavcodec/pthread_frame.c in FFmpeg before 2.7.2 mishandles certain memory-allocation failures, which allows remote attackers to cause a denial of service (invalid pointer access) or possibly have unspecified other impact via a crafted file, as demonstrated by an AVI file.

The ff_rv34_decode_init_thread_copy function in libavcodec/rv34.c in FFmpeg before 2.7.2 does not initialize certain structure members, which allows remote attackers to cause a denial of service (invalid pointer access) or possibly have unspecified other impact via crafted (1) RV30 or (2) RV40 RealVideo data.

ID	Name	Product	Family	Severity
254537	Linux Distros Unpatched Vulnerability : CVE-2015-6823	Nessus	Misc.	high
119816	Debian DLA-1611-2 : libav security update	Nessus	Debian Local Security Checks	high
86044	FreeBSD : ffmpeg -- multiple vulnerabilities (3d950687-b4c9-4a86-8478-c56743547af8)	Nessus	FreeBSD Local Security Checks	high

Detections

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CVE-2015-6823

high

Tenable Plugins

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high