A vlc security update has been released for Debian GNU/Linux 9 LTS to address a number of issues.

DLA 2728-1: vlc security update

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Debian LTS Advisory DLA-2728-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
August 03, 2021   https://wiki.debian.org/LTS
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Package : vlc
Version : 3.0.11-0+deb9u2
CVE IDs : CVE-2021-25801 CVE-2021-25802 CVE-2021-25803 CVE-2021-25804

It was discovered that there were a number of issues in VideoLAN (aka
'vlc', a popular video and multimedia player:

- - CVE-2021-25801: A buffer overflow vulnerability in the __Parse_indx
component allowed attackers to cause an out-of-bounds read via a
crafted .avi file.

- - CVE-2021-25802: A buffer overflow vulnerability in the
AVI_ExtractSubtitle component could have allowed attackers to cause
an out-of-bounds read via a crafted .avi file.

- - CVE-2021-25803: A buffer overflow vulnerability in the
vlc_input_attachment_New component allowed attackers to cause an
out-of-bounds read via a specially-crafted .avi file.

- - CVE-2021-25804: A NULL-pointer dereference in "Open" in avi.c can
result in a denial of service (DoS) vulnerability.

For Debian 9 "Stretch", these problems have been fixed in version
3.0.11-0+deb9u2.

We recommend that you upgrade your vlc packages.

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

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