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=========================================================== Ubuntu Security Notice USN-418-1 February 05, 2007 bind9 vulnerabilities CVE-2007-0493, CVE-2007-0494 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.10 Ubuntu 6.06 LTS Ubuntu 6.10 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 5.10: libdns20 1:9.3.1-2ubuntu1.2 Ubuntu 6.06 LTS: libdns21 1:9.3.2-2ubuntu1.2 Ubuntu 6.10: libdns21 1:9.3.2-2ubuntu3.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: A flaw was discovered in Bind's DNSSEC validation code. Remote attackers could send a specially crafted DNS query which would cause the Bind server to crash, resulting in a denial of service. Only servers configured to use DNSSEC extensions were vulnerable.