CVE-2009-2407

Desbordamiento de búfer basado en memoria dinámica en la función parse_tag_3_packet en fs/ecryptfs/keystore.c en el subsistema eCryptfs del kernel de Linux anteriores a v2.6.30.4 permite a usuarios locales provocar una denegación de servicio (finalización del sistema) o posiblemente obtener mayores privilegios mediante vectores que emplean un fichero eCryptfs modificado, relacionado con un tamaño de clave de cifrado larga en un paquete "Tag 3".

Michael Tokarev discovered that the RTL8169 network driver did not correctly validate buffer sizes. A remote attacker on the local network could send specially traffic traffic that would crash the system or potentially grant elevated privileges. Julien Tinnes and Tavis Ormandy discovered that when executing setuid processes the kernel did not clear certain personality flags. A local attacker could exploit this to map the NULL memory page, causing other vulnerabilities to become exploitable. Ubuntu 6.06 was not affected. Matt T. Yourst discovered that KVM did not correctly validate the page table root. A local attacker could exploit this to crash the system, leading to a denial of service. Ubuntu 6.06 was not affected. Ramon de Carvalho Valle discovered that eCryptfs did not correctly validate certain buffer sizes. A local attacker could create specially crafted eCryptfs files to crash the system or gain elevated privileges. Ubuntu 6.06 was not affected.