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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.310 -- OpenBSD Security Advisory buffer overflow in the DNS resolver 27 June 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: dns resolver Vendor: OpenBSD Operating System: OpenBSD 2.8 OpenBSD 2.9 OpenBSD 3.0 OpenBSD 3.1 Impact: Execute Arbitrary Code/Commands Access Required: Remote Ref: ESB-2002.309 - --------------------------BEGIN INCLUDED TEXT-------------------- Description: A buffer overflow has been found in the BSD DNS resolver. Impact: It may be possible for an attacker with control over a DNS zone to cause a buffer overflow in applications doing standard DNS calls (gethostbyname(), gethostbyaddr(), etc). It is not known at this time whether or not such an overflow could be used to escalate privileges. We suggest users assume the worst and patch their systems. Credit: The bug was found and fix a proposed by Joost Pol. The patches used were written by Jun-ichiro "itojun" Hagino. The following patches are available: OpenBSD 3.1: ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.1/common/007_resolver.patch OpenBSD 3.0: ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.0/common/025_resolver.patch OpenBSD 2.9: ftp://ftp.openbsd.org/pub/OpenBSD/patches/2.9/common/027_resolver.patch The OpenBSD 2.9 patch also applies cleanly to OpenBSD 2.8. The OpenBSD 3.1, 3.0 and 2.9 patch branches (aka OpenBSD-stable) also contain the patch. - --------------------------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. 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 use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). 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. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPRtAqSh9+71yA2DNAQECqwP+O8eLv/JahfoXrITuDP91xN006fKVc1Mq 4aqO92t8YxFUgnFFcyimvoNVjDstkNDo/SIa4VjAm/Y2quNDCkUTFf+yWxMrlRMg O7ZT5LvG46Via2/ytUGwgERKV/RcXQawLpoMeeux354lEknmVHzF8O4iMwiYItrl xoI+W8MgfPk= =lLT9 -----END PGP SIGNATURE-----