Reachable Assertion in frr - CVE-2022-36440
Published: August 18, 2023
Vulnerability identifier: #VU79710
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-36440
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion within the peek_for_as4_capability() function. A remote attacker can send specially crafted traffic to the application and perform a denial of service (DoS) attack.
Affected software
frr
Oracle Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
frr (Red Hat package)
frr
Oracle Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
frr (Red Hat package)
frr
How to mitigate CVE-2022-36440
Install updates from vendor's website.
frr - update to 8.4
frr (Red Hat package) - update to 8.3.1-11.el9_3
frr - addressed in versions 8.5-1.fc36, 8.5-1.fc37, 8.5-1.fc38
frr (Red Hat package) - update to 8.3.1-11.el9_3
frr - addressed in versions 8.5-1.fc36, 8.5-1.fc37, 8.5-1.fc38
External References
- https://github.com/spwpun/pocs/blob/main/frr-bgpd.md
- https://github.com/spwpun/pocs
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GM66PNHGCXZU66LQCTP2FSJLFF6CVMSI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3HU4PKLUVB5CTMOVQ2GV33TNUNMJCBGD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BBXEXL2ZQBWCBLNUP6P67FHECXQWSK3L/