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.

• CWE-22

• https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790Third Party Advisory
• https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646Patch, Third Party Advisory
• https://github.com/plougher/squashfs-tools/issues/72Exploit, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/08/msg00030.htmlMailing List, Third Party Advisory
• 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://security.gentoo.org/glsa/202305-29
• https://www.debian.org/security/2021/dsa-4967Third Party Advisory
• https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790Third Party Advisory
• https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646Patch, Third Party Advisory
• https://github.com/plougher/squashfs-tools/issues/72Exploit, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/08/msg00030.htmlMailing List, Third Party Advisory
• 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://security.gentoo.org/glsa/202305-29
• https://www.debian.org/security/2021/dsa-4967Third Party Advisory

Published

Aug 27, 2021

Last Modified

Jun 17, 2026

Status

Modified

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