=========================================================== Ubuntu Security Notice USN-888-1 January 20, 2010 bind9 vulnerabilities CVE-2009-4022, CVE-2010-0097, CVE-2010-0290 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 8.04 LTS Ubuntu 8.10 Ubuntu 9.04 Ubuntu 9.10 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: libdns23 1:9.3.2-2ubuntu1.11 Ubuntu 8.04 LTS: libdns36 1:9.4.2.dfsg.P2-2ubuntu0.5 Ubuntu 8.10: libdns44 1:9.5.0.dfsg.P2-1ubuntu3.5 Ubuntu 9.04: libdns46 1:9.5.1.dfsg.P2-1ubuntu0.4 Ubuntu 9.10: libdns53 1:9.6.1.dfsg.P1-3ubuntu0.3 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: It was discovered that Bind would incorrectly cache bogus NXDOMAIN responses. When DNSSEC validation is in use, a remote attacker could exploit this to cause a denial of service, and possibly poison DNS caches. (CVE-2010-0097) USN-865-1 provided updated Bind packages to fix a security vulnerability. The upstream security patch to fix CVE-2009-4022 was incomplete and CVE-2010-0290 was assigned to the issue. This update corrects the problem. Original advisory details: Michael Sinatra discovered that Bind did not correctly validate certain records added to its cache. When DNSSEC validation is in use, a remote attacker could exploit this to spoof DNS entries and poison DNS caches. Among other things, this could lead to misdirected email and web traffic.