Security features bypass in FreeBSD - CVE-2023-4809
Published: September 7, 2023
Vulnerability identifier: #VU80514
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-4809
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass implemented firewall rules.
The vulnerability exists due to improper handling of multiple IPv6 fragment headers in pf implementation with "scrub fragment reassemble" rule. A remote attacker can send specially crafted IPv6 packets to the system and bypass implemented filtration rules.
Affected software
FreeBSD
How to mitigate CVE-2023-4809
Install updates from vendor's website.