CVE-2021-40153

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 v3.1

8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

CVSS v2.0

5.8 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:P

EPSS

2.50% chance of exploitation in the next 30 days, 84th percentile

Published

2021-08-27

Updated

2024-08-04

Proof-of-concept exploits (1)

• plougher/squashfs-tools/issues/72

References

• CVE Record
• NVD entry

Related

• CVE-2021-41072
• CVE-2021-40150
• CVE-2021-40154
• CVE-2021-4015
• CVE-2021-4017
• CVE-2021-40149