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Category:   Application (File Transfer/Sharing)  >   FTP (Microsoft) Vendors:   Microsoft
Microsoft Windows FTP Client Input Validation Hole Lets Remote Servers Create/Overwrite Files on the Target User's System
SecurityTracker Alert ID:  1015036
SecurityTracker URL:  http://securitytracker.com/id/1015036
CVE Reference:   CVE-2005-2126   (Links to External Site)
Updated:  Jan 24 2008
Original Entry Date:  Oct 11 2005
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Microsoft Windows FTP Client. A remote FTP server can overwrite files on the target user's system during an FTP transfer initiated by the target user.

The Windows FTP Client does not properly validate filenames supplied by remote FTP servers. When the user of a FTP client choses to transfer a file, the server can supply a specially crafted filename to cause the requested file to be written to an arbitrary location on the target user's system.

Impact:   A remote FTP server can create or overwrite files on the target user's system during an FTP transfer initiated by the target user.
Solution:   The vendor has issued the following fixes:

Microsoft Windows XP Service Pack 1:

http://www.microsoft.com/downloads/details.aspx?FamilyId=351C63A3-AB62-418D-8678-3AF791D73A29

Microsoft Windows Server 2003:

http://www.microsoft.com/downloads/details.aspx?FamilyId=4940CF64-E1FD-4E88-8980-3106BE03BF12

Microsoft Windows Server 2003 for Itanium-based Systems:

http://www.microsoft.com/downloads/details.aspx?FamilyId=B715147B-DE2D-4F14-9548-AFF18641D0F3

Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4:

http://www.microsoft.com/downloads/details.aspx?FamilyId=FCEA60E5-9EA8-4216-BA4D-C85054892DBB

A restart is required in most cases.

Vendor URL:  www.microsoft.com/technet/security/Bulletin/MS05-044.mspx (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (2000), Windows (2003), Windows (XP)

Message History:   None.


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