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Category:   OS (Microsoft)  >   Windows Kernel Vendors:   Microsoft
Microsoft Windows ANI File Parsing Errors Let Remote Users Deny Service
SecurityTracker Alert ID:  1012683
SecurityTracker URL:  http://securitytracker.com/id/1012683
CVE Reference:   CAN-2004-1305   (Links to External Site)
Updated:  Mar 6 2005
Original Entry Date:  Dec 24 2004
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): XP SP2 is not affected
Description:   A denial of service vulnerability was reported in the Microsoft Windows kernel in the parsing of ANI files. A remote user can cause the target user's system to hang or crash.

A remote user can create a specially crafted Windows animated cursor file (ANI file) that, when loaded by the target user, will cause the target system to crash. The malicious file can be loaded via HTML, for example.

The software does not properly validate user-supplied frame numbers and rate numbers in the ANI file header.

A demonstration exploit is available at:

http://www.xfocus.net/flashsky/icoExp/index.html

Sylvain Bruyere and Flashsky (fangxing at venustech.com.cn) separately and independently discovered this vulnerability.

Impact:   A remote user can cause the target user's system to crash.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.microsoft.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 11 2005 (Vendor Issues Fix) Microsoft Windows ANI File Parsing Errors Let Remote Users Deny Service
Microsoft has issued a fix.



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