SB2023120761 - TCP spoofing in FreeBSD pf

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Main Vulnerability Database SB2023120761

SB2023120761 - TCP spoofing in FreeBSD pf

Published: December 7, 2023

Security Bulletin ID SB2023120761
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Input validation error (CVE-ID: CVE-2023-6534)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green


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.

References