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=========================================================== Ubuntu Security Notice USN-450-1 April 09, 2007 ipsec-tools vulnerability CVE-2007-1841 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.10 Ubuntu 6.06 LTS Ubuntu 6.10 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 5.10: racoon 1:0.6-1ubuntu1.2 Ubuntu 6.06 LTS: racoon 1:0.6.5-4ubuntu1.1 Ubuntu 6.10: racoon 1:0.6.6-1ubuntu1.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: A flaw was discovered in the IPSec key exchange server "racoon". Remote attackers could send a specially crafted packet and disrupt established IPSec tunnels, leading to a denial of service.