CVE-2021-28650

autoar-extractor.c in GNOME gnome-autoar before 0.3.1, as used by GNOME Shell, Nautilus, 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-2020-36241.

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/gnome-autoar/-/commit/8109c368c6cfdb593faaf698c2bf5da32bb1ace4
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BN5TVQ7OHZEGY6AGFLAZWCVCI53RYNHQ/
• https://security.gentoo.org/glsa/202105-10
• https://gitlab.gnome.org/GNOME/gnome-autoar/-/commit/8109c368c6cfdb593faaf698c2bf5da32bb1ace4
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BN5TVQ7OHZEGY6AGFLAZWCVCI53RYNHQ/
• https://security.gentoo.org/glsa/202105-10