Symptom
A vulnerability in the Internet Key Exchange (IKE) version 1 (v1) code of Cisco Adaptive Security Appliance (ASA) Software could allow an
unauthenticated, remote attacker to cause an affected system to reload.
The vulnerability is due to improper handling of Internet Security Association and Key Management Protocol (ISAKMP) packets. An attacker could
exploit this vulnerability by sending crafted UDP packets to the affected system. A successful exploit could allow the attacker to cause an
affected system to reload.
Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in
routed firewall mode only and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic.
Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This
advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-asa-ike
Conditions
See Cisco Security Advisory
Workaround
See Cisco Security Advisory
Further Problem Description
PSIRT Evaluation:
The Cisco PSIRT has assigned this bug the following CVSS version 2 score. The Base and Temporal CVSS scores as of the time of evaluation are 7.8/6.4:
http://tools.cisco.com/security/center/cvssCalculator.x?vector=AV:N/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C&version=2.0
CVE ID CVE-2015-6327 has been assigned to document this issue.
Additional information on Cisco's security vulnerability policy can be found at the following URL:
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
