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>> Microsoft Windows NAT Helper Components DNS Denial of Service Vulnerability
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Title : Microsoft Windows NAT Helper Components DNS Denial of Service Vulnerability
VUPEN ID : VUPEN/ADV-2006-4248
CVE ID : CVE-2006-5614
Rated as : Low Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2006-10-30
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A vulnerability has been identified in Microsoft Windows, which could be exploited by malicious users to cause a denial of service. This flaw is due to a NULL pointer dereference error in the NAT Helper Components ("ipnathlp.dll") when processing requests via the "DnsProcessQueryMessage()" and "NatCreateRedirect()" functions, which could be exploited by attackers on the LAN to crash the Service Host Process by sending a specially crafted DNS request to a vulnerable system with Internet Connection Sharing enabled.
Note : A proof of concept exploit has been published.
Affected Products
Microsoft Windows XP Service Pack 2
Microsoft Windows XP Service Pack 1
Solution
VUPEN Security is not aware of any vendor-supplied patch.
References
http://www.vupen.com/english/advisories/2006/4248
Credits
Vulnerability reported by h07
ChangeLog
2006-10-30 : Initial release
Vulnerability Management
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