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Debian LTS Advisory DLA-2752-1                [email protected]
https://www.debian.org/lts/security/                    Thorsten Alteholz
August 31, 2021                               https://wiki.debian.org/LTS
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Package        : squashfs-tools
Version        : 1:4.3-3+deb9u2
CVE ID         : CVE-2021-40153

An issue has been found in squashfs-tools, a tool to create and append to 
squashfs filesystems.
As unsquashfs did not validate all filepaths, it would allow writing 
outside of the original destination.

For Debian 9 stretch, this problem has been fixed in version

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:

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