Cisco IOS and IOS XE Software IPv6 First Hop Security Denial of Service Vulnerabilities

2015-09-23T16:00:00
ID CISCO-SA-20150923-FHS
Type cisco
Reporter Cisco
Modified 2016-12-08T15:19:38

Description

A vulnerability in the IPv6 snooping feature from the first-hop security features in Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload.

The vulnerability is due to insufficient Control Plane Protection (CPPr) against specific IPv6 ND packets. An attacker could exploit this vulnerability by sending a flood of traffic consisting of specific IPv6 ND packets to an affected device where the IPv6 snooping feature is configured.

A vulnerability in the IPv6 snooping feature from the first-hop security features in Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload.

The vulnerability is due to insufficient validation of IPv6 ND packets that use the Cryptographically Generated Address (CGA) option. An attacker could exploit this vulnerability by sending a malformed packet to an affected device where the IPv6 Snooping feature is enabled.

Two vulnerabilities in the IPv6 first hop security feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload.

Cisco has released software updates that address these vulnerabilities. There are no workarounds to mitigate these vulnerabilities. This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150923-fhs["http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150923-fhs"]

Note: The September 23, 2015, release of the Cisco IOS and IOS XE Software Security Advisory bundled publication includes three Cisco Security Advisories. All the advisories address vulnerabilities in Cisco IOS Software and Cisco IOS XE Software. Individual publication links are in Cisco Event Response: September 2015 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep15.html["http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep15.html"]