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AUSCERT External Security Bulletin Redistribution
ESB-2015.1527
Cisco IOS XR Software Crafted IPv6 Packet Denial of Service Vulnerability
12 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XR Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0769
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150611-iosxr
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Cisco Security Advisory: Cisco IOS XR Software Crafted IPv6 Packet Denial of Service Vulnerability
Advisory ID: cisco-sa-20150611-iosxr
Revision 1.0
For Public Release 2015 June 11 16:00 UTC (GMT)
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Summary
=======
A vulnerability in the IP version 6 (IPv6) processing code of Cisco IOS XR Software for Cisco CRS-3 Carrier Routing System could allow an unauthenticated, remote attacker to trigger an ASIC scan of the Network Processor Unit (NPU) and a reload of the line card processing an IPv6 packet.
The vulnerability is due to incorrect processing of an IPv6 packet carrying IPv6 extension headers that are valid but unlikely to be seen during normal operation. An attacker could exploit this vulnerability by sending such an IPv6 packet to an affected device that is configured to process IPv6 traffic. An exploit could allow the attacker to cause a reload of the line card, resulting in a DoS condition.
Cisco has released free software updates that address this vulnerability. There is no workaround that mitigates this vulnerability.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150611-iosxr
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