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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0767 -- [OpenBSD] Buffer Overflow in OpenBSD dhcpd server 12 October 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: dhcpd Operating System: OpenBSD Impact: Execute Arbitrary Code/Commands Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2007-5365 Original Bulletin: http://www.openbsd.org/errata42.html http://marc.info/?l=openbsd-security-announce&m=119196568123812&w=2 Comment: This vulnerability appears to only exist in the OpenBSD version of dhcpd. The ISC sourse code, as well as FreeBSD and NetBSD, do not appear to be vulnerable. Revision History: October 12 2007: Added CVE October 10 2007: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Summary: Malicious DHCP clients on the local network could cause dhcpd(8) to corrupt its stack. Impact: A DHCP client with a carefully chosen maximum message size that is less than the minimum IP MTU could lead to a buffer overflow in dhcpd(8). This could cause dhcpd(8) to crash or could potentially result in remote code execution. Workaround: Disable dhcpd if it is enabled. Note that OpenBSD does not ship with dhcpd(8) enabled by default. Fix: A fix has been committed to OpenBSD-current. Patches are available for OpenBSD 4.2, 4.1 and 4.0. ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/001_dhcpd.patch ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.1/common/010_dhcpd.patch ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/016_dhcpd.patch Credits: The bug was found by Nahuel Riva and Gerardo Richarte of Core Security Technologies - --------------------------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 iQCVAwUBRw60TCh9+71yA2DNAQKynwQAjptTiHwJGDli9qeLK1CbJQ3xwZ17Vlya v5Lvz/64VBzk1+r4oJmu6pOC+afScVxxoPb5OmJn57nOSrtsXxcm7zTCyUUOSa5x MRJyLfPujBt7anAwyQ4AxtkCwzEmeiUiAeObohzIB5Cm7kN/z0UV3xsac6SuOJiN i3CdhOepNOw= =m+oZ -----END PGP SIGNATURE-----