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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT Security Bulletin ASB-2010.0244 A number of vulnerabilities have been identified in BIND 3 December 2010 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND prior to 9.7.2-P3 BIND prior to 9.6.2-P3 BIND prior to 9.6-ESV-R3 BIND prior to 9.4-ESV-R4 Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Unauthorised Access -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2010-3615 CVE-2010-3614 CVE-2010-3613 Member content until: Sunday, January 2 2011 OVERVIEW A number of vulnerabilities have been identified in BIND prior to versions 9.7.2-P3, 9.6.2-P3, 9.6-ESV-R3, 9.4-ESV-R4. IMPACT The vendor has provided the following description of these vulnerabilities: CVE-2010-3613: "Adding certain types of signed negative responses to cache doesn't clear any matching RRSIG records already in cache. A subsequent lookup of the cached data can cause named to crash (INSIST)." [1] CVE-2010-3614: "named, acting as a DNSSEC validator, was determining if an NS RRset is insecure based on a value that could mean either that the RRset is actually insecure or that there wasn't a matching key for the RRSIG in the DNSKEY RRset when resuming from validating the DNSKEY RRset. This can happen when in the middle of a DNSKEY algorithm rollover, when two different algorithms were used to sign a zone but only the new set of keys are in the zone DNSKEY RRset." [2] CVE-2010-3615: "When named is running as an authoritative server for a zone and receives a query for that zone data, it first checks for allow-query acls in the zone statement, then in that view, then in global options. If none of these exist, it defaults to allowing any query (allow-query {"any"};). With this bug, if the allow-query is not set in the zone statement, it failed to check in view or global options and fell back to the default of allowing any query. This means that queries that the zone owner did not wish to allow were incorrectly allowed. This bug doesn't affect allow-recursion or allow-query-cache acls, since they are not relevant to a zone for which the server is authoritative." [3] MITIGATION The vendor recommends upgrading to the latest version of BIND to correct these vulnerabilities. REFERENCES [1] BIND: cache incorrectly allows a ncache entry and a rrsig for the same type https://www.isc.org/software/bind/advisories/cve-2010-3613 [2] BIND: Key algorithm rollover bug in bind9 https://www.isc.org/software/bind/advisories/cve-2010-3614 [3] BIND: allow-query processed incorrectly https://www.isc.org/software/bind/advisories/cve-2010-3615 AusCERT has made every effort to ensure that the information contained in this document is accurate. However, the decision to use the information described is the responsibility of each user or organisation. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iD8DBQFM+Ggw/iFOrG6YcBERAqpaAJ9kIXcjV2w9czB7GNVcVa8QvgHGEQCaAk+u W+2QbTDMIRi1ZaNRRkoOtxw= =xkVr -----END PGP SIGNATURE-----