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CVE-2021-41072

Status Candidate

Overview

squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

Related Files

Gentoo Linux Security Advisory 202305-29
Posted May 30, 2023
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202305-29 - Multiple vulnerabilities have been discovered in squashfs-tools, the worst of which can result in an arbitrary file write. Versions greater than or equal to 4.5_p20210914 are affected.

tags | advisory, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2021-40153, CVE-2021-41072
SHA-256 | 41d12184d7c1d9e0b9fa6af6edbc6e9856d3a69d307703dd95cbde672592e475
Debian Security Advisory 4987-1
Posted Oct 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4987-1 - 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.

tags | advisory, arbitrary
systems | linux, debian
advisories | CVE-2021-41072
SHA-256 | 5bdedd741ddca312ddaa409fd8416bc522c6f837900bc51f74100ec3ea343990
Ubuntu Security Notice USN-5078-3
Posted Oct 13, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5078-3 - USN-5078-1 fixed a vulnerability in Squashfs-Tools. That update was incomplete and could still result in Squashfs-Tools mishandling certain malformed SQUASHFS files. This update fixes the problem. Richard Weinberger discovered that Squashfs-Tools mishandled certain malformed SQUASHFS files. An attacker could use this vulnerability to write arbitrary files to the filesystem. Various other issues were also addressed.

tags | advisory, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-41072
SHA-256 | 7a38fac3a6c70cba474a9afe981c571a1b55956f49b48f20169c2a6ad02eda40
Ubuntu Security Notice USN-5078-2
Posted Sep 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5078-2 - USN-5078-1 fixed several vulnerabilities in Squashfs-Tools. This update provides the corresponding update for Ubuntu 16.04 ESM. Etienne Stalmans discovered that Squashfs-Tools mishandled certain malformed SQUASHFS files. An attacker could use this vulnerability to write arbitrary files to the filesystem. Various other issues were also addressed.

tags | advisory, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-40153, CVE-2021-41072
SHA-256 | a52baf7e1b98fc9a9e68e2c58c2ce1b009b09c3956c00ae061c209948fce2a18
Ubuntu Security Notice USN-5078-1
Posted Sep 15, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5078-1 - Richard Weinberger discovered that Squashfs-Tools mishandled certain malformed SQUASHFS files. An attacker could use this vulnerability to write arbitrary files to the filesystem.

tags | advisory, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-41072
SHA-256 | 29045801f6c03dcd7332efc0bb67025d0097e29be1019ac6339d9f4bf614eaed
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