Vulnerability Note VU#951982

Microsoft Windows UDP packet parsing vulnerability

Overview

A vulnerability in the Microsoft Windows TCP/IP stack could allow an attacker to run arbitrary code in kernel mode or cause a denial-of-service.

I. Description

Microsoft Windows contains a TCP/IP stack used to process network packets for the operating system. This component contains a vulnerability when processing a continuous flow of specially crafted UDP packets, which results in an integer overflow.

II. Impact

Microsoft Security Bulletin MS11-083 states:

An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

III. Solution

Apply an update

This issue is addressed in Microsoft Security Bulletin MS11-083.

Block unused UDP ports at the perimeter firewall

Microsoft is recommending states that blocking unused (closed) UDP ports at the perimeter firewall helps protect systems that are behind that firewall from attempts to exploit this vulnerability. Microsoft has additional information on tcp and udp port assignments their website.

Vendor Information

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Affected		2011-11-08

References

http://technet.microsoft.com/en-us/security/bulletin/ms11-083
http://blogs.technet.com/b/srd/archive/2011/11/08/assessing-the-exploitability-of-ms11-083.aspx

Credit

Thanks to Microsoft Security Response Center for reporting this vulnerability.

This document was written by Michael Orlando.

Other Information

Date Public:	2011-11-08
Date First Published:	2011-11-08
Date Last Updated:	2011-11-08
CERT Advisory:
CVE-ID(s):	CVE-2011-2013
NVD-ID(s):	CVE-2011-2013
US-CERT Technical Alerts:
Severity Metric:	20.66
Document Revision:	7