From af143a26ef96ba9be7b9c0b151b7605e1c2c74cd Mon Sep 17 00:00:00 2001 From: CROSS Date: Mon, 26 Sep 2011 13:17:21 +0400 Subject: ospfd: CVE-2011-3326 (uknown LSA type segfault) This vulnerability (CERT-FI #514837) was reported by CROSS project. They have also suggested a fix to the problem, which was found acceptable. Quagga ospfd does not seem to handle unknown LSA types in a Link State Update message correctly. If LSA type is something else than one supported by Quagga, the default handling of unknown types leads to an error. * ospf_flood.c * ospf_flood(): check return value of ospf_lsa_install() --- ospfd/ospf_flood.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'ospfd/ospf_flood.c') diff --git a/ospfd/ospf_flood.c b/ospfd/ospf_flood.c index 41661da2..fc0bbf12 100644 --- a/ospfd/ospf_flood.c +++ b/ospfd/ospf_flood.c @@ -319,7 +319,8 @@ ospf_flood (struct ospf *ospf, struct ospf_neighbor *nbr, procedure cannot overwrite the newly installed LSA until MinLSArrival seconds have elapsed. */ - new = ospf_lsa_install (ospf, nbr->oi, new); + if (! (new = ospf_lsa_install (ospf, nbr->oi, new))) + return 0; /* unknown LSA type */ /* Acknowledge the receipt of the LSA by sending a Link State Acknowledgment packet back out the receiving interface. */ -- cgit v1.2.1