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=========================================================== Ubuntu Security Notice USN-500-1 August 20, 2007 rsync vulnerability CVE-2007-4091 =========================================================== 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: rsync 2.6.6-1ubuntu2.1 Ubuntu 6.10: rsync 2.6.8-2ubuntu3.1 Ubuntu 7.04: rsync 2.6.9-3ubuntu1.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: Sebastian Krahmer discovered that rsync contained an off-by-one miscalculation when handling certain file paths. By creating a specially crafted tree of files and tricking an rsync server into processing them, a remote attacker could write a single NULL to stack memory, possibly leading to arbitrary code execution.