Cisco fixes OSPF flaw affecting multiple products

Cisco has shipped a patch for a buggy Open Shortest Path First (OSPF) routing implementation it says offers exploits that include traffic blackholing or interception. As the advisory notes, the vulnerability “could allow an unauthenticated attacker to take full control of the OSPF Autonomous System (AS) domain routing table, blackhole traffic, and intercept traffic”. Crafted OSPF packets can be sent to devices running the faulty code, and those packets would make the targeted router flush its routing table. A crafted OSPF Link State Advertisement (LSA) type 1 update can then be propagated through a targeted domain. <more>