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OpenBSD dhcpd Buffer Overflow Vulnerability
Secunia Advisory:	SA27160	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2007-10-10
Last Update:	2007-10-11
Popularity:	7,801 views

Critical:	Moderately critical
Impact:	DoS System access
Where:	From local network
Solution Status:	Vendor Patch

OS:	OpenBSD 3.x OpenBSD 4.0 OpenBSD 4.1 OpenBSD 4.2

Binary Analysis:	BA255 :: Available for Credits

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2007-0063 CVE-2007-5365

Description: A vulnerability has been reported in OpenBSD, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise a vulnerable system. The vulnerability is caused due to the improper handling of DHCP requests within dhcpd in the "cons_options()" function in options.c. This can be exploited to cause a stack-based buffer overflow by sending a specially crafted DHCP request specifying a maximum message size between DHCP_FIXED_LEN and DHCP_FIXED_LEN + 3. Successful exploitation may allow the execution of arbitrary code. Solution: Apply vendor patches. OpenBSD 4.0: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/016_dhcpd.patch OpenBSD 4.1: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.1/common/010_dhcpd.patch OpenBSD 4.2: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/001_dhcpd.patch Provided and/or discovered by: Nahuel Riva and Gerardo Richarte, CORE IMPACT Exploit Writers Team Changelog: 2007-10-11: Updated the "Description" section and the credits. Added CVE reference. 2007-10-11: Added CVE reference. Original Advisory: Core Security Technologies: http://www.coresecurity.com/index.php...ontentMod&action=item&id=1962 OpenBSD: http://www.openbsd.org/errata40.html Extended Solution: The "Extended Solution" section is available for Secunia customers only. Request a trial and get access to the Secunia Customer Area and Extended Secunia advisories.

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