CVE-2024-53259

Name of the Vulnerable Software and Affected Versions: quic-go versions prior to 0.48.2

Description: An off-path attacker can inject an ICMP Packet Too Large packet, disrupting a QUIC connection by setting the MTU value to smaller than 1200 bytes. This can be done after the handshake completion, circumventing any TCP fallback. The attacker needs to know the client's IP and port tuple to mount an attack.

Recommendations: For versions prior to 0.48.2, upgrade to version 0.48.2 to fix the vulnerability. As a temporary workaround, consider using IP PMTUDISC PROBE instead of IP PMTUDISC DO to disable the kernel's MTU tracking. Alternatively, use iptables to drop ICMP Unreachable packets to minimize the risk of exploitation.