An updated ipsec-tools package that fixes a bug in parsing of ISAKMP headers is now available. This update has been rated as having moderate security impact by the Red Hat Security Response Team.
The ipsec-tools package is used in conjunction with the IPsec functionality in the linux kernel. The ipsec-tools package includes: - setkey, a program to directly manipulate policies and SAs - racoon, an IKEv1 keying daemon A bug was found in the way the racoon daemon handled incoming ISAKMP requests. It is possible that an attacker could crash the racoon daemon by sending a specially crafted ISAKMP packet. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0398 to this issue. Additionally, the following issues have been fixed: - racoon mishandled restarts in the presence of stale administration sockets. - on CentOS Linux 4, racoon and setkey did not properly set up forward policies, which prevented tunnels from working. Users of ipsec-tools should upgrade to this updated package, which contains backported patches, and is not vulnerable to these issues.