CVE-2021-40153
Published: August 31, 2023Last modified: August 31, 2023
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | squashfs-tools | Not affected (4.5.1-r2) |
| Stream | squashfs-tools | Not affected (4.6.1-r1) |
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.debian.org/debian-lts-announce/2021/08/msg00030.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
- https://security.gentoo.org/glsa/202305-29
- https://www.debian.org/security/2021/dsa-4967