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Microsoft Windows Active Directory fails to properly validate client sent LDAP requests

Vulnerability Note VU#348953

Original Release Date: 2007-07-11 | Last Revised: 2007-07-11


Microsoft Windows Active Directory fails to properly validate client-sent LDAP requests and may result in a denial of service condition.


Microsoft Windows Active Directory contains a vulnerability in the way that the LDAP service validates the number of convertible attributes in the client-sent request. By sending a specially crafted LDAP request to a server running Active Directory, an attacker may be able to cause the server to stop responding.


A remote attacker may be able to cause a denial of service condition.


Apply an Update

Microsoft has released updates in Microsoft Security Bulletin MS07-039 to address this issue.


Microsoft suggests blocking port 389/tcp and port 3268/tcp at the firewall to prevent exploitation of this vulnerability. Please see Microsoft Security Bulletin MS07-039 for further information.

Vendor Information


Microsoft Corporation Affected

Updated:  July 10, 2007



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Microsoft has published Microsoft Security Bulletin MS07-039 in response to this issue. Users are encouraged to review this bulletin and apply the referenced patches.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector



This vulnerability was reported in Microsoft Security Bulletin MS07-039. Microsoft credits Peter Winter-Smith of NGSSoftware for reporting the vulnerability to them.

This document was written by Katie Steiner.

Other Information

CVE IDs: CVE-2007-3028
Severity Metric: 0.39
Date Public: 2007-07-10
Date First Published: 2007-07-11
Date Last Updated: 2007-07-11 20:13 UTC
Document Revision: 8

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