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=========================================================== Ubuntu Security Notice USN-436-2 May 18, 2007 ktorrent vulnerability CVE-2007-1799 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 6.10 Ubuntu 7.04 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: ktorrent 1.2-0ubuntu5.2 Ubuntu 6.10: ktorrent 2.0.3+dfsg1-0ubuntu1.2 Ubuntu 7.04: ktorrent 2.1-0ubuntu2.1 After a standard system upgrade you need to restart KTorrent to effect the necessary changes. Details follow: USN-436-1 fixed a vulnerability in KTorrent. The original fix for path traversal was incomplete, allowing for alternate vectors of attack. This update solves the problem. Original advisory details: Bryan Burns of Juniper Networks discovered that KTorrent did not correctly validate the destination file paths nor the HAVE statements sent by torrent peers. A malicious remote peer could send specially crafted messages to overwrite files or execute arbitrary code with user privileges.