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Fencer Intel
medium 6.7

CVE-2022-42917 json

In FRRouting FRR before 8.5, the service user (usually frr) can escalate its privileges to root by monitoring the configuration directory (…

published last mo. modified last mo. also EUVD-2022-56059

cvss
6.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • FRRouting FRRouting 4.5
  • frr Debian 14, Debian 13, Debian 12 8.4.1-1

debian advisories DEBIAN-CVE-2022-42917

  • frr SLE Module for Server Applications 15 SP4, SLE Module for Server Applications 15 SP3, openSUSE Leap 15.4 +1 more 7.4-150300.4.10.1

suse advisories SUSE-SU-2022:4130-1

  • frr openSUSE Tumbleweed 8.4-1.1

opensuse advisories openSUSE-SU-2024:12516-1

Is CVE-2022-42917 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-42917 updated cvss 6.7

frr: FRRouting FRR: Privilege escalation via TOCTOU race condition

  • Red Hat Enterprise Linux 8 frr, frr-contrib, frr-selinux Red Hat Enterprise Linux 9 frr, frr-selinux
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fast Datapath for RHEL 10 frr, frr-selinux Red Hat Enterprise Linux 9 frr10, frr10-selinux Red Hat Enterprise Linux 10 frr
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

  • FRRouting FRRouting

Classification

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

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.