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Insecure Library Loading
Not critical

Microsoft Windows Active Directory Logon Hours User Enumeration Weakness

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Release Date:  2007-05-31    Last Update:  2008-11-27    Views:  15,826

Secunia Advisory SA25457

Where:

From local network

Impact:

Exposure of system information

Solution Status:

Unpatched

CVE Reference(s):

Description


Sumit Siddharth has reported a weakness in Microsoft Windows, which can be exploited by malicious people to identify valid user accounts.

Active Directory allows "Logon Hours" to be set for a user, which results in a different error message being returned when attempting to log on during a period that is set as "Logon Denied".

The weakness is reported in Microsoft Windows Server 2003 Standard Edition. Other versions may also be affected.


Solution:
A security fix will reportedly not be issued, but will be considered in the next version or service pack.

Provided and/or discovered by:
Sumit Siddharth

Original Advisory:
http://www.notsosecure.com/folder2/2007/05/27/logon-time-restrictions-in-a-domain-in-windows-server-2003-allows-username-enumeration/

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Windows Active Directory Logon Hours User Enumeration Weakness

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