CVE-2024-3652

Se notificó a Libreswan Project sobre un problema que provocaba que libreswan se reiniciara al usar IKEv1 sin especificar una línea esp=. Cuando el par solicita AES-GMAC, el controlador de propuestas predeterminado de libreswan provoca un error de aserción, falla y se reinicia. Las conexiones IKEv2 no se ven afectadas.

A flaw was found in Libreswan, where it was identified to contain an assertion failure issue in the compute_proto_keymat() function. The vulnerability can be exploited when an IKEv1 connection is loaded with an AH/ESP default setting when no esp= line is present in the connection. This flaw allows an authenticated attacker to send the bogus AES-GMAC proposal request, triggering the issue and causing Libreswan to crash and restart. When this connection is automatically added on startup using the auto= keyword, it can cause repeated crashes, leading to a denial of service. No remote code execution is possible.

An update for libreswan is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service.