Bug 2532800 (CVE-2022-42917)

Summary: CVE-2022-42917 frr: FRRouting FRR: Privilege escalation via TOCTOU race condition
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: echaudro, fleitner, ktraynor, rhel-process-autobot, rkhan, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FRRouting FRR. A local service user can exploit a Time-of-check to time-of-use (TOCTOU) race condition by monitoring the configuration directory and replacing configuration files with symbolic links during their creation. This manipulation allows the user to change the ownership of arbitrary files. This can lead to privilege escalation, allowing the service user to gain root privileges.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2532944    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-13 23:31:16 UTC 
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.