FreeBSD Packet Filter Bypass

The vulnerability of the packet filter component in the FreeBSD operating system is related to errors that occur when the scrub fragment reassemble rule is used. Exploiting this vulnerability can allow a remote attacker to bypass existing firewall rules...

CVE-2023-4809

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...

CVE-2023-4809: Improper Handling of Additional Special Element

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...

CVE-2006-0381: Undefined Security Weakness

A logic error in the IP fragment cache functionality in pf in FreeBSD 5.3, 5.4, and 6.0, and OpenBSD, when a 'scrub fragment crop' or 'scrub fragment drop-ovl' rule is being used, allows remote attackers to cause a denial of service crash via crafted packets that cause a packet fragment to be...