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Insecure Library Loading
Moderately critical

OpenBSD dhcpd Buffer Overflow Vulnerability

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Release Date:  2007-10-10    Last Update:  2007-10-11    Views:  14,052

Secunia Advisory SA27160

Where:

From local network

Impact:

DoS, System access

Solution Status:

Vendor Patch

CVE Reference(s):

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.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Nahuel Riva and Gerardo Richarte, CORE IMPACT Exploit Writers Team

Original Advisory:
Core Security Technologies:
http://www.coresecurity.com/index.php5?module=ContentMod&action=item&id=1962

OpenBSD:
http://www.openbsd.org/errata40.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: OpenBSD dhcpd Buffer Overflow Vulnerability

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