CVE-2021-40153
HIGH8.1EPSS 0.54%squashfs-tools - security update
Published: 8/27/2021Modified: 12/3/2025
Also known as:ALPINE-CVE-2021-40153
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.
Affected packages (4)
- Alpine/squashfs-toolsfrom 0, < 4.5-r0
- Debian/squashfs-toolsfrom 0, < 1:4.4-2+deb11u1
- Debian/squashfs-toolsfrom 0, < 1:4.3-3+deb9u2
- Debian/squashfs-toolsfrom 0, < 1:4.3-12+deb10u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |