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/squashfs-tools
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/squashfs-tools
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