CVE-2020-24654

In KDE Ark before 20.08.1, a crafted TAR archive with symlinks can install files outside the extraction directory, as demonstrated by a write operation to a users home directory.

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

• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00001.html
• https://bugzilla.suse.com/show_bug.cgi?id=1175857
• https://github.com/KDE/ark/commit/8bf8c5ef07b0ac5e914d752681e470dea403a5bd
• https://kde.org/info/security/advisory-20200827-1.txt
• https://lists.debian.org/debian-lts-announce/2022/05/msg00026.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LXMMXNJDYOCJRZTESIUGHG6CS4RJKECX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJOZ6YRNPZX5MJGVBMOCOA7N6Z4EU2OK/
• https://security.gentoo.org/glsa/202010-06
• https://security.gentoo.org/glsa/202101-06
• https://usn.ubuntu.com/4482-1/
• https://www.debian.org/security/2020/dsa-4759