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CVE-2021-41072

squashfs-tools: possible Directory Traversal via symbolic link

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.

CVSS 3.1 · 8.1 High EPSS 2.3% KEV · Not listed
Vendors
Debian Redhat Squashfs-tools Project
Products
Debian Linux Enterprise Linux Squashfs-tools
CVE-2021-40153

squashfs-tools: unvalidated filepaths allow writing outside of destination

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 3.1 · 8.1 High EPSS 2.5% KEV · Not listed
Vendors
Debian Fedoraproject Redhat and 1 more
Products
Debian Linux Fedora Enterprise Linux and 1 more