CVE-2023-6534

En las versiones de FreeBSD 14.0-RELEASE anteriores a 14-RELEASE-p2, FreeBSD 13.2-RELEASE anteriores a 13.2-RELEASE-p7 y FreeBSD 12.4-RELEASE anteriores a 12.4-RELEASE-p9, el filtro de paquetes pf(4) valida incorrectamente los números de secuencia TCP. Esto podría permitir que un actor malintencionado ejecute un ataque de denegación de servicio contra hosts detrás del firewall.

As part of its stateful TCP connection tracking implementation, pf performs sequence number validation on inbound packets. This makes it difficult for a would-be attacker to spoof the sender and inject packets into a TCP stream, since crafted packets must contain sequence numbers which match the current connection state to avoid being rejected by the firewall. A bug in the implementation of sequence number validation means that the sequence number is not in fact validated, allowing an attacker who is able to impersonate the remote host and guess the connection's port numbers to inject packets into the TCP stream. An attacker can, with relatively little effort, inject packets into a TCP stream destined to a host behind a pf firewall. 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.