CVE-2017-12319
CVE-2017-12319
En resumen
Un fallo en la implementación BGP EVPN de Cisco IOS XE permite que un atacante envíe un paquete de red especialmente diseñado que puede bloquear el dispositivo o corromper su tabla de enrutamiento, interrumpiendo el tráfico de la red.
Detalle técnico
La vulnerabilidad resulta del cálculo incorrecto del campo de longitud de dirección IP en el procesamiento de paquetes BGP Inclusive Multicast Ethernet Tag Route y BGP EVPN MAC/IP Advertisement Route. Un atacante remoto no autenticado con una sesión BGP establecida puede enviar un paquete malformado para provocar recarga del dispositivo o corrupción de la tabla de enrutamiento BGP, resultando en denegación de servicio. Afecta versiones de Cisco IOS XE anteriores a la 16.3 con BGP EVPN habilitado.
Resumen generado y traducido por IA a partir de la descripción oficial.
A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability. The vulnerability exists due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft between IOS XE software releases. When the BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet is received, it could be possible that the IP address length field is miscalculated. An attacker could exploit this vulnerability by sending a crafted BGP packet to an affected device after the BGP session was established. An exploit could allow the attacker to cause the affected device to reload or corrupt the BGP routing table; either outcome would result in a DoS. The vulnerability may be triggered when the router receives a crafted BGP message from a peer on an existing BGP session. This vulnerability affects all releases of Cisco IOS XE Software prior to software release 16.3 that support BGP EVPN configurations. If the device is not configured for EVPN, it is not vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H