Buffer Overflow If You Pass an Extremely Long File Name to the TFTP Client (314288)

The information in this article applies to:

Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Professional SP1
Microsoft Windows 2000 Professional SP2

This article was previously published under Q314288

SYMPTOMS

If you try to use the Trivial File Transfer Protocol (TFTP) program to transfer a file that has an extremely long file name, TFTP.exe may stop responding.

CAUSE

This behavior occurs because an extremely long file name (a file name that is made up of hundreds of characters) causes a buffer overflow in the TFTP client program (Tftp.exe). The following example of a TFTP command illustrates this behavior:

tftp -i 192.168.1.1 GET aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English-language version of this fix should have the following file attributes or later:

   Date         Time   Version        Size    File name
   ----------------------------------------------------
   07-Dec-2001  20:56  5.0.2195.4742  17,680  Tftp.exe

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.

MORE INFORMATION

This hotfix resolves this issue by checking string length before an extremely long string over-runs the buffers.

Modification Type:	Minor	Last Reviewed:	9/26/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbSecurity kbWin2000PreSP3Fix kbWin2000sp3fix KB314288