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Debian Security Advisory 4967-1

Debian Security Advisory 4967-1
Posted Sep 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4967-1 - Etienne Stalmans discovered that unsquashfs in squashfs-tools, the tools to create and extract Squashfs filesystems, does not validate filenames for traversal outside of the destination directory. An attacker can take advantage of this flaw for writing to arbitrary files to the filesystem if a malformed Squashfs image is processed.

tags | advisory, arbitrary
systems | linux, debian
advisories | CVE-2021-40153
SHA-256 | c7522b4eeabe8c9588e7d48cd0cc114c4b00a72b7777470016051ed6fbc09d70

Debian Security Advisory 4967-1

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4967-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 04, 2021 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : squashfs-tools
CVE ID : CVE-2021-40153

Etienne Stalmans discovered that unsquashfs in squashfs-tools, the tools
to create and extract Squashfs filesystems, does not validate filenames
for traversal outside of the destination 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 the oldstable distribution (buster), this problem has been fixed
in version 1:4.3-12+deb10u1.

For the stable distribution (bullseye), this problem has been fixed in
version 1:4.4-2+deb11u1.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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