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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
(OpenBSD Issues Fix) ISC DHCP Can Be Crashed By Remote Users with a Specially Crafted DHCPOFFER Packet
SecurityTracker Alert ID:  1016758
SecurityTracker URL:  http://securitytracker.com/id/1016758
CVE Reference:   CVE-2006-3122   (Links to External Site)
Date:  Aug 25 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.0pl5
Description:   A vulnerability was reported in ISC's DHCP. A remote user can cause denial of service conditions.

A remote user can send a specially crafted DHCPOFFER packet that is exactly 32 bytes long to cause the target DHCP service to crash.

The flaw resides in the supersede_lease() function in memory.c.

DHCP version 3 servers are not affected.

Andrew Steets reported this vulnerability on July 28, 2006.

Impact:   A remote user can cause the DHCP service to crash.
Solution:   OpenBSD has issued the following fixes:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/011_dhcpd.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/006_dhcpd.patch

Vendor URL:  www.isc.org/sw/dhcp/ (Links to External Site)
Cause:   Exception handling error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.8, 3.9

Message History:   This archive entry is a follow-up to the message listed below.
Aug 25 2006 ISC DHCP Can Be Crashed By Remote Users with a Specially Crafted DHCPOFFER Packet



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