SB2016081803 - Remote code execution in Cisco ASA Appliances

Description

This security bulletin contains information about 1 security vulnerability.

1) SNMP remote code execution (CVE-ID: CVE-2016-6366)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling SNMP packets. A remote attacker with knowledge of SNMP community string can cause buffer overflow and cause the target device to reload or execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in full compromise of affected system.

The following models of CISCO ASA appliances are affected:

• Cisco ASA 5500 Series Adaptive Security Appliances
• Cisco ASA 5500-X Series Next-Generation Firewalls
• Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
• Cisco ASA 1000V Cloud Firewall
• Cisco Adaptive Security Virtual Appliance (ASAv)
• Cisco Firepower 9300 ASA Security Module
• Cisco PIX Firewalls
• Cisco Firewall Services Module (FWSM)

Note: this is a zero-day vulnerability, discovered after security breach of The Equation Group. The exploit code for this vulnerability was publicly exposed and is referred as EXTRABACON Exploit.

Remediation

Install update from vendor's website.

References

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp
• https://blogs.cisco.com/security/shadow-brokers