CVE-2024-3661 – DHCP routing options can manipulate interface-based VPN traffic

https://notcve.org/view.php?id=CVE-2024-3661

DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN. Por diseño, el protocolo DHCP no autentica mensajes, incluida, por ejemplo, la opción de ruta estática sin clases (121). Un atacante con la capacidad de enviar mensajes DHCP puede manipular rutas para redirigir el tráfico VPN, lo que le permite leer, interrumpir o posiblemente modificar el tráfico de red que se esperaba que estuviera protegido por la VPN. • https://github.com/a1xbit/DecloakingVPN https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose https://bst.cisco.com/quickview/bug/CSCwk05814 https://datatracker.ietf.org/doc/html/rfc2131#section-7 https://datatracker.ietf.org/doc/html/rfc3442#section-7 https://fortiguard.fortinet.com/psirt/FG-IR-24-170 https://issuetracker.google.com/issues/263721377 https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-c • CWE-306: Missing Authentication for Critical Function CWE-501: Trust Boundary Violation •