Updated ipsec-tools packages that fix a denial of service flaw in racoon are now available for CentOS Linux 5. 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 and includes racoon, an IKEv1 keying daemon. A denial of service flaw was found in the ipsec-tools racoon daemon. It was possible for a remote attacker, with knowledge of an existing ipsec tunnel, to terminate the ipsec connection between two machines. (CVE-2007-1841) Users of ipsec-tools should upgrade to these updated packages, which contain a backported patch that resolves this issue.
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