CVE-2022-42917

Published: Sep 14, 2026Modified: Sep 14, 2026

6.7

Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Exploitability: 0.8 / Impact: 5.9

Source: MITRE (Secondary)

Description

In FRRouting FRR before 8.5, the service user (usually frr) can escalate its privileges to root by monitoring the configuration directory (/etc/frr) and replacing config files upon creation with, for example, symlinks to change the ownership of arbitrary files. This is a TOCTOU Race Condition caused by a combination of touch and chown.

Related CWEs

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

References (4)

https://bugzilla.suse.com/show_bug.cgi?id=1204124

Source: cve@mitre.org

https://frrouting.org/security/cve-2022-42917/

Source: cve@mitre.org

https://github.com/FRRouting/frr/commit/972cdc560e339d70c0ee5fb70ec636ab78f00bca

Source: cve@mitre.org

https://github.com/FRRouting/frr/compare/frr-8.4...frr-8.5

Source: cve@mitre.org

Timeline

No history available yet.