Cisco Security Advisory: OSPF LSA Manipulation Vulnerability in Multiple Cisco Products

[Cisco Systems Product Security Incident Response Team <psirt () cisco com>]

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Cisco Security Advisory: OSPF LSA Manipulation Vulnerability in Multiple Cisco Products

Advisory ID: cisco-sa-20130801-lsaospf

Revision 1.0

For Public Release 2013 August 1 16:00  UTC (GMT)

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Summary
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Multiple Cisco products are affected by a vulnerability involving the Open Shortest Path First (OSPF) Routing Protocol 
Link State Advertisement (LSA) database. This vulnerability could allow an unauthenticated attacker to take full 
control of the OSPF Autonomous System (AS) domain routing table, blackhole traffic, and intercept traffic.

The attacker could trigger this vulnerability by injecting crafted OSPF packets. Successful exploitation could cause 
flushing of the routing table on a targeted router, as well as propagation of the crafted OSPF LSA type 1 update 
throughout the OSPF AS domain.

To exploit this vulnerability, an attacker must accurately determine certain parameters within the LSA database on the 
target router. This vulnerability can only be triggered by sending crafted unicast or multicast LSA type 1 packets. No 
other LSA type packets can trigger this vulnerability.

OSPFv3 is not affected by this vulnerability. Fabric Shortest Path First (FSPF) protocol is not affected by this 
vulnerability.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability 
are available. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130801-lsaospf
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