CVE-2017-7482

en el kernel de Linux en versiones anteriores a la 4.12, los tickets de Kerberos 5 descifrados al emplear las claves RXRPC de forma incorrecta asumen el tamaño de un campo. Esto podría conducir a un wrapping de la variable que mantiene el tamaño y en que el puntero de datos vaya más allá final del búfer. Esto podría conducir a una corrupción de memoria y a un posible escalado de privilegios.

Keberos 5 tickets being decoded when using the RXRPC keys incorrectly assumes the size of a field. This could lead to the size-remaining variable wrapping and the data pointer going over the end of the buffer. This could possibly lead to memory corruption and possible privilege escalation.

It was discovered that a use-after-free flaw existed in the filesystem encryption subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel could overflow reference counters on systems with more than 32GB of physical ram and with RLIMIT_MEMLOCK set to infinite. A local unprivileged attacker could use to create a use-after- free situation, causing a denial of service (system crash) or possibly gain administrative privileges. Various other issues were also addressed.