Cisco Security Advisory: Cisco ASA Software DHCPv6 Relay Denial of Service Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt@xxxxxxxxx>]

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Cisco Security Advisory: Cisco ASA Software DHCPv6 Relay Denial of Service 
Vulnerability

Advisory ID: cisco-sa-20151021-asa-dhcp1

Revision 1.0

For Public Release 2015 October 21 16:00  UTC (GMT)

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Summary
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A vulnerability in the DHCPv6 relay feature of Cisco Adaptive Security 
Appliance (ASA) software could allow an unauthenticated, remote attacker to 
cause an affected device to reload.

The vulnerability is due to insufficient validation of DHCPv6 packets. Cisco 
ASA Software is affected by this vulnerability only if the software is 
configured with the DHCPv6 relay feature. An attacker could exploit this 
vulnerability by sending crafted DHCPv6 packets to an affected device.


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-dhcp1



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