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=========================================================== Ubuntu Security Notice USN-565-1 January 09, 2008 squid vulnerability CVE-2007-6239 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 6.10 Ubuntu 7.04 Ubuntu 7.10 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 6.06 LTS: squid 2.5.12-4ubuntu2.3 Ubuntu 6.10: squid 2.6.1-3ubuntu1.5 Ubuntu 7.04: squid 2.6.5-4ubuntu2.1 Ubuntu 7.10: squid 2.6.14-1ubuntu2.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: It was discovered that Squid did not always clean up cache memory correctly. A remote attacker could manipulate cache update replies and cause Squid to use all available memory, leading to a denial of service.