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[Full-disclosure] Cisco Security Advisory: OSPF LSA Manipulation Vulnerability in Multiple Cisco Products

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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
=======

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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