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
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
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