The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities.

The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload.

Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable.

There are workarounds that address these vulnerabilities.

El protocolo SNMP (SimpleNetwork Management Protocol) de Cisco iOS 12.0 hasta la 12.4, 15.0 hasta la 15.6 e iOS XE 2.2 hasta la 3.17 contiene múltiples vulnerabilidades que pueden permitir una autenticación a un atacante remoto para ejecutar código remotamente en el sistema afectado o causar una recarga. Un atacante podría explotar estas vulnerabilidades enviando un paquete SNMP manipulado al sistema afectado mediante IPv4 o IPv6. Solo el tráfico directo al sistema afectado puede usarse para explotar estar vulnerabilidades. Esta vulnerabilidades son debidas a un buffer overflow en el subsistema SNMP del software afectado. Esta vulnerabilidad afecta a todas las versiones de SNMP: Versiones 1, 2c y 3. Para explotarlas en versiones 2c o anteriores, el atacante debe saber sobre la cadena comunitaria de solo lectura del SNMP del sistema afectado. Pra explotarlas en las versión 3, el atacante tiene que tener credenciales de usuario del sistema. Todos los dispositivos que tienen habilitado el SNMP y no tienen una exclusión explicita del MIB u OID afectado debe ser considerado vulnerable. Cisco Bug IDs: CSCve66601.