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=========================================================== Ubuntu Security Notice USN-566-1 January 09, 2008 openssh vulnerability CVE-2007-4752 =========================================================== 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: openssh-client 1:4.2p1-7ubuntu3.2 Ubuntu 6.10: openssh-client 1:4.3p2-5ubuntu1.1 Ubuntu 7.04: openssh-client 1:4.3p2-8ubuntu1.1 Ubuntu 7.10: openssh-client 1:4.6p1-5ubuntu0.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: Jan Pechanec discovered that ssh would forward trusted X11 cookies when untrusted cookie generation failed. This could lead to unintended privileges being forwarded to a remote host.