A ffmpeg security update has been released for Debian GNU/Linux 9 LTS to address multiple issues.

DLA 2742-1: ffmpeg security update

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Debian LTS Advisory DLA-2742-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
August 14, 2021   https://wiki.debian.org/LTS
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Package : ffmpeg
Version : 7:3.2.15-0+deb9u3
CVE ID : CVE-2020-21041 CVE-2020-22015 CVE-2020-22016 CVE-2020-22020
CVE-2020-22021 CVE-2020-22022 CVE-2020-22023 CVE-2020-22025
CVE-2020-22026 CVE-2020-22028 CVE-2020-22031 CVE-2020-22032
CVE-2020-22036 CVE-2021-3566 CVE-2021-38114

Multiple issues have been discovered in ffmpeg.

CVE-2020-21041

Buffer Overflow vulnerability exists via apng_do_inverse_blend in
libavcodec/pngenc.c, which could let a remote malicious user cause a
Denial of Service.

CVE-2020-22015

Buffer Overflow vulnerability in mov_write_video_tag due to the out of
bounds in libavformat/movenc.c, which could let a remote malicious user
obtain sensitive information, cause a Denial of Service, or execute
arbitrary code.

CVE-2020-22016

A heap-based Buffer Overflow vulnerability at libavcodec/get_bits.h when
writing .mov files, which might lead to memory corruption and other
potential consequences.

CVE-2020-22020

Buffer Overflow vulnerability in the build_diff_map function in
libavfilter/vf_fieldmatch.c, which could let a remote malicious user cause
a Denial of Service.

CVE-2020-22021

Buffer Overflow vulnerability at filter_edges function in
libavfilter/vf_yadif.c, which could let a remote malicious user cause a
Denial of Service.

CVE-2020-22022

A heap-based Buffer Overflow vulnerability exists in filter_frame at
libavfilter/vf_fieldorder.c, which might lead to memory corruption and other
potential consequences.

CVE-2020-22023

A heap-based Buffer Overflow vulnerabililty exists in filter_frame at
libavfilter/vf_bitplanenoise.c, which might lead to memory corruption and
other potential consequences.

CVE-2020-22025

A heap-based Buffer Overflow vulnerability exists in gaussian_blur at
libavfilter/vf_edgedetect.c, which might lead to memory corruption and other
potential consequences.

CVE-2020-22026

Buffer Overflow vulnerability exists in the config_input function at
libavfilter/af_tremolo.c, which could let a remote malicious user cause a
Denial of Service.

CVE-2020-22028

Buffer Overflow vulnerability in filter_vertically_8 at
libavfilter/vf_avgblur.c, which could cause a remote Denial of Service.

CVE-2020-22031

A Heap-based Buffer Overflow vulnerability in filter16_complex_low, which
might lead to memory corruption and other potential consequences.

CVE-2020-22032

A heap-based Buffer Overflow vulnerability in gaussian_blur, which might
lead to memory corruption and other potential consequences.

CVE-2020-22036

A heap-based Buffer Overflow vulnerability in filter_intra at
libavfilter/vf_bwdif.c, which might lead to memory corruption and other
potential consequences.

CVE-2021-3566

The tty demuxer did not have a 'read_probe' function assigned to it. By
crafting a legitimate "ffconcat" file that references an image, followed by
a file the triggers the tty demuxer, the contents of the second file will be
copied into the output file verbatim (as long as the `-vcodec copy` option
is passed to ffmpeg).

CVE-2021-38114

libavcodec/dnxhddec.c does not check the return value of the init_vlc
function. Crafted DNxHD data can cause unspecified impact.

For Debian 9 stretch, these problems have been fixed in version
7:3.2.15-0+deb9u3.

We recommend that you upgrade your ffmpeg packages.

For the detailed security status of ffmpeg please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/ffmpeg

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS