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OSPF: corrupting the routing database
Synthesis of the vulnerability
An attacker can spoof OSPF messages, in order to corrupt the routing database.
Impacted products: CheckPoint IP Appliance, IPSO, CheckPoint Security Gateway, Cisco ASR, ASA, Cisco Catalyst, IOS Cisco, IOS XE Cisco, Cisco Nexus, NX-OS, Cisco Router xx00 Series, ProCurve Switch, HP Switch, Juniper E-Series, Juniper J-Series, JUNOS, JUNOSe, NetScreen Firewall, ScreenOS, SUSE Linux Enterprise Desktop, SLES.
Creation date: 02/08/2013.
Revision date: 01/08/2014.
Identifiers: BID-61566, c03880910, CERTA-2013-AVI-458, CERTA-2013-AVI-487, CERTA-2013-AVI-508, cisco-sa-20130801-lsaospf, CQ95773, CSCug34469, CSCug34485, CSCug39762, CSCug39795, CSCug63304, CVE-2013-0149, HPSBHF02912, JSA10575, JSA10580, JSA10582, PR 878639, PR 895456, sk94490, SUSE-SU-2014:0879-1, VIGILANCE-VUL-13192, VU#229804.
Description of the vulnerability
The RFC 2328 defines the OSPF protocol (Open Shortest Path First) which established IP routes, using LSA (Link State Advertisement) messages.
The LSA Type 1 Update (LSU, Link-State Update) message is used to update the routing database. However, the RFC does not request to check the "Link State ID" and "Advertising Router" fields of LSU messages. Several implementations (Cisco, Juniper, etc.) therefore do not perform this check.
An attacker can thus spoof a LSU message if he knows:
- the IP address of the target router
- LSA DB sequence numbers
- the router ID of the OSPF Designated Router
An attacker can therefore spoof OSPF messages, in order to corrupt the routing database.
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