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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0050 -- [Win][UNIX/Linux] Vulnerabilities in BIND 9 may allow remote Denial of Service 19 February 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIND 9 Publisher: ISC Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact: Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2007-0493 CVE-2007-0494 Original Bulletin: http://www.isc.org/sw/bind/bind-security.php Comment: Note that there are two ISC bulletins in this advisory. Revision History: February 19 2007: Added CVEs. January 25 2007: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Internet Systems Consortium Security Advisory. BIND 9: DNSSEC Validation 10 January 2007 Versions affected: BIND 9.0.x (all versions of BIND 9.0) (at end-of-life) BIND 9.1.x (all versions of BIND 9.1) (at end-of-life) BIND 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7 BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3 BIND 9.4.0a1, 9.4.0a2, 9.4.0a3, 9.4.0a4, 9.4.0a5, 9.4.0a6, 9.4.0b1 9.4.0b2, 9.4.0b3, 9.4.0b4, 9.4.0rc1 BIND 9.5.0a1 (Bind Forum only) Severity: Low Exploitable: Remotely Description: When validating responses to type * (ANY) queries that return multiple RRsets in the answer section it is possible to trigger assertions checks. To be vulnerable you need to have enabled dnssec validation in named.conf by specifying trusted-keys. Workaround: Disable / restrict recursion (to limit exposure). Disable DNSSEC validation (remove all trusted-keys from named.conf). Fix: Upgrade to BIND 9.2.8, BIND 9.3.4 or BIND 9.4.0rc2. Additionally this will be fixed in the upcoming BIND 9.5.0a2. Note: It is recommended that anyone using DNSSEC upgrade to BIND 9.3 as the DNSSEC implementation in BIND 9.2 has been obsoleted. Revision History: - --------------------------------------------------------------------------- Internet Systems Consortium Security Advisory. BIND 9: dereferencing freed fetch context 12 January 2007 Versions affected: BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3 BIND 9.4.0a1, 9.4.0a2, 9.4.0a3, 9.4.0a4, 9.4.0a5, 9.4.0a6, 9.4.0b1 9.4.0b2, 9.4.0b3, 9.4.0b4, 9.4.0rc1 BIND 9.5.0a1 (Bind Forum only) Severity: Low Exploitable: Remotely Description: It is possible for the named to dereference (read) a freed fetch context. This can cause named to exit unintentionally. Workaround: Disable / restrict recursion (to limit exposure). Fix: Upgrade to BIND 9.2.8, BIND 9.3.4 or BIND 9.4.0rc2. Additionally this will be fixed in the upcoming BIND 9.5.0a2. Revision History: - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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 iQCVAwUBRdkrISh9+71yA2DNAQJRwAP/YC3lOeCHWDFI4+NyoO4VxczJ3BQbzFPh tvZO9rSnkSa+Go+qGxZSK/jgR/+sQWSzk9lc6MqgCe4HU/RF2hj8sxH2vw5gDtFC OhTpeFwTngJVV2rKCdJ+Zg3SaDJ5KZrp4o6W9uuWUvkCvfeVuDFBadvIQHIleign hsFAMbbUBGI= =XUDh -----END PGP SIGNATURE-----