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Microsoft Windows Internet Connection Sharing Denial of Service
Secunia Advisory: SA22592
Release Date: 2006-10-30
Last Update: 2006-11-02
Popularity: 19,436 views

Critical:
Less critical
Impact: DoS
Where: From local network
Solution Status: Unpatched

OS:Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

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CVE reference:CVE-2006-5614


Description:
h07 has discovered a vulnerability in Microsoft Windows, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a NULL pointer dereference error in Windows NAT Helper Components (ipnathlp.dll). This can be exploited to crash the service via a specially crafted DNS query.

Successful exploitation requires that Internet Connection Sharing is enabled and the query is received from a client on the shared network interface.

The vulnerability is confirmed in a fully patched Windows XP SP2 system. Other versions may also be affected.

Solution:
Use another way of sharing the Internet connection.

Provided and/or discovered by:
h07

Changelog:
2006-11-02: Added CVE reference.

Original Advisory:
http://milw0rm.com/exploits/2672


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