CVEvulnerability
CVE-2021-40153
8.1 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-08-27
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
- CVSS 2.0 ([email protected])
- 5.8 MEDIUM — AV:N/AC:M/Au:N/C:N/I:P/A:P
- Weaknesses
- CWE-22
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 configurations
• squashfs-tools project squashfs-tools 4.5
• fedoraproject fedora 34
• debian debian linux 9.0
• debian debian linux 10.0
• redhat enterprise linux 7.0
• redhat enterprise linux 8.0
• fedoraproject fedora 33
Related
Weakness · CWE (1)
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness
References
- https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790 Third Party Advisory
- https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646 Patch, Third Party Advisory
- https://github.com/plougher/squashfs-tools/issues/72 Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/ lists.fedoraproject.org
- https://security.gentoo.org/glsa/202305-29 security.gentoo.org
- https://www.debian.org/security/2021/dsa-4967 Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790 Third Party Advisory
- https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646 Patch, Third Party Advisory
- https://github.com/plougher/squashfs-tools/issues/72 Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/ lists.fedoraproject.org
- https://security.gentoo.org/glsa/202305-29 security.gentoo.org
- https://www.debian.org/security/2021/dsa-4967 Third Party Advisory