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Insecure Library Loading
Moderately critical

Microsoft Windows Enhanced/Windows Metafile Handling Vulnerability

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Release Date:  2004-02-25    Views:  27,068

Secunia Advisory SA10968

Where:

From remote

Impact:

Privilege escalation, DoS, System access

Solution Status:

Unpatched

CVE Reference(s):

No CVE references.

Description


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

The vulnerability is caused due to boundary errors (possibly in "shimgvw.dll") when processing Enhanced Metafiles (".emf"). The problem is that memory is allocated based on size information in the file's header.

This can be exploited to cause heap overflows by specifying a "Size" field, which is smaller (e.g. 1 byte) than the actual size of the file and header. The vulnerability will be triggered by either viewing a malicious file or by navigating to a directory, which contains a malicious file and displays it as a thumbnail.

Successful exploitation crashes "explorer.exe" but may reportedly also allow execution of arbitrary code.

NOTE: Windows Metafiles (".wmf") with malformed "Size" fields will also impact functionality somewhat by consuming 99% CPU resources.


Solution:
Grant only trusted users access to affected systems. Don't view untrusted ".emf" files. Don't display the contents of directories as thumbnails.

Provided and/or discovered by:
Jellytop

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 Enhanced/Windows Metafile Handling Vulnerability

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