Vulnerability CVE-2021-40153
Published: 2021-08-27

Description:
squashfs_opendir in unsquash-1.c in Squashfs-Tools 4.5 stores the filename in the directory entry; this is then used by unsquashfs to create the new file during the unsquash. The filename is not validated for traversal outside of the destination directory, and thus allows writing to locations outside of the destination.

Type:

CWE-22

 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Squashfs-tools project -> Squashfs-tools 
Fedoraproject -> Fedora 
Debian -> Debian linux 

 References:
https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790
https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646
https://github.com/plougher/squashfs-tools/issues/72
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html
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