Vulnerability Note VU#122076

Microsoft Windows fails to properly create entries in the Local Descriptor Table (LDT)

Overview

Microsoft Windows NT4.0 and Windows 2000 contain a vulnerability that could permit a local user to gain elevated privileges on the system.

I. Description

Microsoft Windows NT4.0 and Windows 2000 provide an API to the kernel to create Local Descriptor Tables (LDT) for applications. A failure to filter content in the programming interface could permit an attacker to access and modify protected memory space. This could result in the attacker gaining elevated privileges. The vulnerable function in the API is NtSetLdtEntries. For more details, please see Microsoft Security Bulletin MS04-011 and eEye Digital Security Advisory [AD20040413D].

II. Impact

A local user may be able to gain elevated privileges on the system.

III. Solution

Apply a patch from the vendor

Microsoft Security Bulletin MS04-011 contains patch information to resolve this issue.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	14-Apr-2004

References

http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx
http://www.eeye.com/html/Research/Advisories/AD20040413D.html

Credit

Thanks to Microsoft and eEye Digital Security for reporting this vulnerability.

This document was written by Jason A Rafail.

Other Information

Date Public:	2004-04-13
Date First Published:	2004-04-14
Date Last Updated:	2004-04-14
CERT Advisory:
CVE-ID(s):	CAN-2003-0910
NVD-ID(s):	CAN-2003-0910
US-CERT Technical Alerts:
Metric:	9.06
Document Revision:	3

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