CVE-2023-4809 (GCVE-0-2023-4809)
Vulnerability from cvelistv5
Published
2023-09-06 19:26
Modified
2025-02-13 17:18
Severity ?
CWE
  • CWE-167 - Improper Handling of Additional Special Element
Summary
In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed. That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is. As a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.
References
Impacted products
Vendor Product Version
FreeBSD FreeBSD Version: 13.2-RELEASE
Version: 12.4-RELEASE
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  }
}


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