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Insecure Library Loading
Moderately critical

Microsoft Windows Environment Variable Expansion Library Loading Vulnerability

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Release Date:  2010-10-28    Last Update:  2012-03-30    Views:  9,272

Secunia Advisory SA41984

Where:

From remote

Impact:

System access

Solution Status:

Unpatched

CVE Reference(s):

Description


A vulnerability has been discovered in Microsoft Windows, which can be exploited by malicious people to potentially compromise a user's system.

The vulnerability is caused due to Windows not properly expanding certain values in environment variables (e.g. "%APPDATA%" in the "PATH" environment variable), leading to the unexpanded value being used as relative search path when loading resources. This can be exploited to load arbitrary resources by tricking a user into opening a file located on a remote WebDAV or SMB share with certain applications.

Successful exploitation allows execution of arbitrary code. Currently, known applications presenting valid attack vectors are e.g. Apple iTunes and Safari.

The vulnerability is confirmed in a fully patched Windows XP Professional SP3 and is also reported in Windows Vista Business, and Windows 7 Professional. Other versions may also be affected.


Solution:
Do not open untrusted files.

Provided and/or discovered by:
Known, documented bug in Windows.

Security impact reported by ACROS Security.

Original Advisory:
Windows KB32908:
http://support.microsoft.com/kb/329308

ACROS Security:
http://blog.acrossecurity.com/2010/10/breaking-setdlldirectory-protection.html

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 Environment Variable Expansion Library Loading Vulnerability

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