CVE-2020-36314

fr-archive-libarchive.c in GNOME file-roller through 3.38.0, as used by GNOME Shell and other software, allows Directory Traversal during extraction because it lacks a check of whether a files parent is a symlink in certain complex situations. NOTE: this issue exists because of an incomplete fix for CVE-2020-11736.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• https://gitlab.gnome.org/GNOME/file-roller/-/commit/e970f4966bf388f6e7c277357c8b186c645683ae
• https://gitlab.gnome.org/GNOME/file-roller/-/issues/108
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6KJBZVCHQ4SSX2JAJZVJ5J4P3GEMXJ75/