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=========================================================== Ubuntu Security Notice USN-775-1 May 12, 2009 quagga vulnerability CVE-2009-1572 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 8.04 LTS Ubuntu 8.10 Ubuntu 9.04 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: quagga 0.99.2-1ubuntu3.5 Ubuntu 8.04 LTS: quagga 0.99.9-2ubuntu1.2 Ubuntu 8.10: quagga 0.99.9-6ubuntu0.1 Ubuntu 9.04: quagga 0.99.11-1ubuntu0.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: It was discovered that the BGP service in Quagga did not correctly handle certain AS paths containing 4-byte ASNs. An authenticated remote attacker could exploit this flaw to cause bgpd to abort, leading to a denial of service.