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To improve our services to our customers, we have made a number of
additions to the Secunia Advisories and have started translating the
advisories to German.

The improvements will help our customers to get a better
understanding of how we reached our conclusions, how it was rated,
our thoughts on exploitation, attack vectors, and scenarios.

This includes:
* Reason for rating
* Extended description
* Extended solution
* Exploit code or links to exploit code
* Deep links

Read the full description:
http://corporate.secunia.com/products/48/?r=l

Contact Secunia Sales for more information:
http://corporate.secunia.com/how_to_buy/15/?r=l

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TITLE:
Microsoft Windows Internet Connection Sharing Denial of Service

SECUNIA ADVISORY ID:
SA22592

VERIFY ADVISORY:
http://secunia.com/advisories/22592/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

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

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/2672

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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