Directory Traversal Affecting squashfs-tools package, versions <0:4.3-0.21.gitaae0aff4.amzn2.0.2


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.46% (76th percentile)

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  • Snyk IDSNYK-AMZN2-SQUASHFSTOOLS-5789345
  • published20 Jul 2023
  • disclosed27 Aug 2021

Introduced: 27 Aug 2021

CVE-2021-40153  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 squashfs-tools to version 0:4.3-0.21.gitaae0aff4.amzn2.0.2 or higher.
This issue was patched in ALAS2-2023-2152.

NVD Description

Note: Versions mentioned in the description apply only to the upstream squashfs-tools package and not the squashfs-tools package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.

CVSS Scores

version 3.1