SB2023090707 - Improper handling of IPv6 fragment headers in FreeBSD pf
Published: September 7, 2023
Security Bulletin ID
SB2023090707
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Security features bypass (CVE-ID: CVE-2023-4809)
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.
Remediation
Install update from vendor's website.