The Internet Key Exchange version 1 (IKEv1) implementation (isakmpagg.c) in racoon in ipsec-tools before 0.6.3, when running in aggressive mode, allows remote attackers to cause a denial of service (null dereference and crash) via crafted IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1.

The KAME racoon daemon in ipsec-tools before 0.5 allows remote attackers to cause a denial of service (crash) via malformed ISAKMP packets.

Multiple memory leaks in Ipsec-tools before 0.7.2 allow remote attackers to cause a denial of service (memory consumption) via vectors involving (1) signature verification during user authentication with X.509 certificates, related to the eaycheckx509sign function in src/racoon/cryptoopenssl.c; and (2) the NAT-Traversal (aka NAT-T) keepalive implementation, related to src/racoon/nattraversal.c.

ipsec-tools upstream version 0.7.2 announcement mentions following security fix:

o Fix a remote crash in fragmentation code

http://sourceforge.net/project/shownotes.php?groupid=74601&releaseid=677611

Upstream CVS commit provides further details:

From Neil Kettle: Fix a possible null pointer dereference in fragmentation code.

http://cvsweb.netbsd.org/bsdweb.cgi/src/crypto/dist/ipsec-tools/src/racoon/isakmpfrag.c?f=h#rev1.4.6.1 http://cvsweb.netbsd.org/bsdweb.cgi/src/crypto/dist/ipsec-tools/src/racoon/isakmpfrag.c.diff?r1=1.4&r2=1.4.6.1&f=h