A squashfs-tools security update has been released for Debian GNU/Linux 9 LTS to address a flaw that allows an attacker to write arbitrary files to the filesystem.

DLA 2789-1: squashfs-tools security update

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Debian LTS Advisory DLA-2789-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
October 20, 2021   https://wiki.debian.org/LTS
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Package : squashfs-tools
Version : 1:4.3-3+deb9u3
CVE ID : CVE-2021-41072

Richard Weinberger reported that unsquashfs in squashfs-tools, the tools
to create and extract Squashfs filesystems, does not check for duplicate
filenames within a directory. An attacker can take advantage of this flaw
for writing to arbitrary files to the filesystem if a malformed Squashfs
image is processed.

For Debian 9 stretch, this problem has been fixed in version
1:4.3-3+deb9u3.

We recommend that you upgrade your squashfs-tools packages.

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

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