CVE-2010-4160

Múltiples desbordamientos de entero en las funciones (1) pppol2tp_sendmsg de net/l2tp/l2tp_ppp.c, y (2) l2tp_ip_sendmsg de net/l2tp/l2tp_ip.c, en las implementaciones PPPoL2TP y IPoL2TP en el kernel de Linux anterior a v2.6.36.2, permiten a usuarios locales provocar una denegación de servicio (corrupción en el montón de la memoria y pánico) o puede que aumentar privilegios a través de una llamada sendto.

Tavis Ormandy discovered that the Linux kernel did not properly implement exception fixup. A local attacker could exploit this to crash the kernel, leading to a denial of service. Dan Rosenberg discovered that the Linux kernel TIPC implementation contained multiple integer signedness errors. A local attacker could exploit this to gain root privileges. Dan Rosenberg discovered that the Linux kernel X.25 implementation incorrectly parsed facilities. A remote attacker could exploit this to crash the kernel, leading to a denial of service. Vasiliy Kulikov discovered that the Linux kernel X.25 implementation did not correctly clear kernel memory. A local attacker could exploit this to read kernel stack memory, leading to a loss of privacy. Vasiliy Kulikov discovered that the Linux kernel sockets implementation did not properly initialize certain structures. A local attacker could exploit this to read kernel stack memory, leading to a loss of privacy. Nelson Elhage discovered that the Linux kernel IPv4 implementation did not properly audit certain bytecodes in netlink messages. A local attacker could exploit this to cause the kernel to hang, leading to a denial of service. Various other issues were also addressed.