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Windows 2000/XP PostMessage Password Disclosure

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Release Date:  2003-03-18    Views:  16,636

Secunia Advisory SA8329

Where:

Local system

Impact:

Exposure of sensitive information

Solution Status:

Unpatched

CVE Reference(s):

No CVE references.

Description


An information disclosure vulnerability has been identified in Windows 2000 and Windows XP, which can be exploited by a malicious, local user to gain knowledge of sensitive information.

The vulnerability is caused by an access control error in the Windows API, which allows a program using the PostMessage function to send EM_SETPASSWORDCHAR messages to the message queue of dialog boxes owned by other processes. This can be exploited to disclose masked passwords by constructing a password revealing program.

This kind of programs have previously been known for other versions of Windows, but have not existed for Windows 2000/XP, since the SendMessage function exploited in these programs was secured in Windows 2000/XP.


Solution:
Allow only trusted users access to computers and do not download and install programs from untrusted sources. Futhermore, do not rely on programs masking passwords.

Provided and/or discovered by:
Palan

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: Windows 2000/XP PostMessage Password Disclosure

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