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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0261 -- [OpenBSD] IPv6 Type 0 Route Header Design Flaw 27 April 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IPv6 Publisher: OpenBSD Operating System: Various IPv6 router platforms OpenBSD Impact: Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2007-2242 Original Bulletin: http://openbsd.org/errata40.html#012_route6 Comment: Detailed information on the security problems caused by type 0 routing headers in IPv6 and mitigation on various router platforms is provided in the following presentation: http://www.secdev.org/conf/IPv6_RH_security-csw07.pdf Attacks facilitated by this protocol feature include - Denial of service attack amplification - Denial of service attack concentration in time - Potential evasion of some firewalls and IDS - Defeating anycast routing Revision History: April 27 2007: Added CVE and link to further information April 24 2007: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- IPv6 type 0 route headers can be used to mount a DoS attack against hosts and networks. This is a design flaw in IPv6 and not a bug in OpenBSD. This problem has been fixed in the OpenBSD CVS repository in the - -current and -stable branches. The -current snapshots of OpenBSD contain these fixes as well. It is recommended that users of OpenBSD update their kernel asap using cvs or manually apply the source code patches listed below. A source code patch for OpenBSD 4.0-stable can be downloaded from ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/012_route6.patch. A source code patch for OpenBSD 3.9-stable can be downloaded from ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/022_route6.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. 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. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. 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 author's website 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/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 iQCVAwUBRjGJwih9+71yA2DNAQK/XgP/fSXHWKfV6Bs8uPUJMcbJHMVLSGw9cEIW v9vC63UoiUI6GTCoAaU/FLZZeotgoZHetIwAwv+TV2GKSWD7eFkMTPwNS7nIgjbn TC6PY4zoYJm+0swl88h8niv5emuBi2ml8VB7NMHQXKGOCyLYq4jbOO2z19MhKy58 omy8i/VNCsQ= =y/DJ -----END PGP SIGNATURE-----