Memory leak in the virtual private dial-up network (VPDN) component in Cisco IOS before 12.3 allows remote attackers to cause a denial of service (memory consumption) via a series of PPTP sessions, related to "dead memory" that remains allocated after process termination, aka bug ID CSCsj58566.
Fugas de memoria en la componente de red privada virtual dial-up (VPDN) en Cisco IOS versiones anteriores a 12.3 permite a atacantes remotos provocar una denegación de servicio (consumo de memoria) a través de una serie de sesiones PPTP, en relación a "dead memory" que permanece asignado después de la finalización del proceso, también conocido como bug ID CSCsj58566.
Two vulnerabilities exist in the virtual private dial-up network (VPDN) solution when Point-to-Point Tunneling Protocol (PPTP) is used in certain Cisco IOS releases prior to 12.3. PPTP is only one of the supported tunneling protocols used to tunnel PPP frames within the VPDN solution. The first vulnerability is a memory leak that occurs as a result of PPTP session termination. The second vulnerability may consume all interface descriptor blocks on the affected device because those devices will not reuse virtual access interfaces. If these vulnerabilities are repeatedly exploited, the memory and/or interface resources of the attacked device may be depleted.
