CVE-2016-5361

programs/pluto/ikev1.c en libreswan en versiones anteriores a 3.17 retransmite en estados inicial-respuesta, lo que permite a atacantes remotos provocar una denegación de servicio (amplificación de tráfico) a través de un paquete UDP suplantado. NOTA: el comportamiento original cumple con el protocolo IKEv1, pero tiene una actualización de seguridad requerida por el vendedor de libreswan; a partir de 2016-06-10, se espera que otras varias implementaciones IKEv1 tengan actualizaciones de seguridad requeridas por el vendedor, con separadas CVEs IDs asignadas a cada una.

A traffic amplification flaw was found in the Internet Key Exchange version 1 (IKEv1) protocol. A remote attacker could use a libreswan server with IKEv1 enabled in a network traffic amplification denial of service attack against other hosts on the network by sending UDP packets with a spoofed source address to that server.

Libreswan is an implementation of IPsec & IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network. Security Fix: A traffic amplification flaw was found in the Internet Key Exchange version 1 protocol. A remote attacker could use a libreswan server with IKEv1 enabled in a network traffic amplification denial of service attack against other hosts on the network by sending UDP packets with a spoofed source address to that server.