CVE-2016-0746

Vulnerabilidad de uso de memoria previamente liberada en la resolución en nginx, de la versión 0.6.18 hasta la 1.8.0 y versiones 1.9.x anteriores a la 1.9.10, permite que atacantes remotos provoquen una denegación de servicio (cierre inesperado del proceso worker) o que tengan otro tipo de impacto sin especificar mediante una respuesta DNS relacionada con el procesamiento de respuestas CNAME.

A use-after-free flaw was found in the way nginx resolved certain CNAME DNS records. An attacker able to manipulate DNS responses received by nginx could use this flaw to cause a worker process to crash or, possibly, execute arbitrary code if nginx enabled the resolver in its configuration.

It was discovered that nginx incorrectly handled certain DNS server responses when the resolver is enabled. A remote attacker could possibly use this issue to cause nginx to crash, resulting in a denial of service. It was discovered that nginx incorrectly handled CNAME response processing when the resolver is enabled. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.