CVE-2021-41072

squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

• CWE-22
• CWE-59

• https://github.com/plougher/squashfs-tools/commit/e0485802ec72996c20026da320650d8362f555bdPatch, Third Party Advisory
• https://github.com/plougher/squashfs-tools/issues/72#issuecomment-913833405Exploit, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/10/msg00017.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202305-29
• https://www.debian.org/security/2021/dsa-4987Third Party Advisory
• https://github.com/plougher/squashfs-tools/commit/e0485802ec72996c20026da320650d8362f555bdPatch, Third Party Advisory
• https://github.com/plougher/squashfs-tools/issues/72#issuecomment-913833405Exploit, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/10/msg00017.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202305-29
• https://www.debian.org/security/2021/dsa-4987Third Party Advisory

Published

Sep 14, 2021

Last Modified

Jun 17, 2026

Status

Modified

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