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Debian Security Advisory DSA-4987-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
October 15, 2021                      https://www.debian.org/security/faq
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Package        : squashfs-tools
CVE ID         : CVE-2021-41072
Debian Bug     : 994262

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 the oldstable distribution (buster), this problem has been fixed
in version 1:4.3-12+deb10u2.

For the stable distribution (bullseye), this problem has been fixed in
version 1:4.4-2+deb11u2.

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/source-package/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

Debian: DSA-4987-1: squashfs-tools security update

October 15, 2021
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

Summary

For the oldstable distribution (buster), this problem has been fixed
in version 1:4.3-12+deb10u2.

For the stable distribution (bullseye), this problem has been fixed in
version 1:4.4-2+deb11u2.

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/source-package/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

Severity
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.

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