CVE-2022-42917

State: Published
Severity: 6.7 Medium
Published: Sep 13, 2026
Updated: Sep 14, 2026
Reserved: Oct 13, 2022

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.

Scores

CVSS	Score	Vector	Source
3.1	6.7 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H	mitre

Weaknesses

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Affected Products

Product	Versions
FRRoutingFRRouting	before 4.5Affected

References

https://bugzilla.suse.com/show_bug.cgi?id=1204124
https://frrouting.org/security/cve-2022-42917/
https://github.com/FRRouting/frr/commit/972cdc560e339d70c0ee5fb70ec636ab78f00bca
https://github.com/FRRouting/frr/compare/frr-8.4...frr-8.5

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