SB2023120761 - TCP spoofing in FreeBSD pf
Published: December 7, 2023
Security Bulletin ID
SB2023120761
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) Input validation error (CVE-ID: CVE-2023-6534)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to missing validation of TCP sequence numbers on inbound packets in pf(4). A remote attacker can guess the connection's port numbers and inject packets into existing TCP streams, resulting in spoofing attack.
This could be used to implement a denial-of-service attack for hosts behind the firewall, for example by sending TCP RST packets to the host.
Remediation
Install update from vendor's website.