CVE-2018-1064

libvirt, en versiones anteriores a la 4.2.0-rc1 es vulnerable a un agotamiento de recursos como resultado de una solución incompleta para CVE-2018-5748 que afecta al monitor QEMU, pero que ahora también puede desencadenarse mediante el agente invitado de QEMU.

An incomplete fix for CVE-2018-5748 that affects QEMU monitor leading to a resource exhaustion but now also triggered via QEMU guest agent.

Ken Johnson and Jann Horn independently discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via sidechannel attacks. An attacker in the guest could use this to expose sensitive guest information, including kernel memory. This update allows libvirt to expose new CPU features added by microcode updates to guests. Daniel P. Berrange discovered that libvirt incorrectly handled the QEMU guest agent. An attacker could possibly use this issue to consume resources, leading to a denial of service. Various other issues were also addressed.