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Category:   Application (File Transfer/Sharing)  >   TFTP Server 2000 Vendors:   FutureSoft
FutureSoft TFTP Server 2000 Buffer Overflow Lets Remote Users Execute Arbitrary Code and Input Validation Hole Discloses Files to Remote Users
SecurityTracker Alert ID:  1014079
SecurityTracker URL:  http://securitytracker.com/id/1014079
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 31 2005
Impact:   Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Root access via network
Exploit Included:  Yes  
Version(s): 1.0.0.1
Description:   A vulnerability was reported in FutureSoft TFTP Server 2000. A remote user can view arbitrary files on the target system. A remote user can also execute arbitrary code on the target system.

A remote user can send a TFTP Read Request (RRQ) or Write Request (WRQ) packet with a specially crafted filename or transfer-mode string to trigger a buffer overflow and overwrite the SEH and EIP registers. Arbitrary code can be executed with Local System privileges.

A remote user can send a GET request with a specially crafted filename containing directory traversal characters to view files on the target system that are located outside of the TFTP directory.

Some demonstration exploit commands are provided:

tftp -i [target] GET ../../../../../boot.ini

tftp -i [target] GET ..\..\..\..\..\boot.ini

The vendor was notified on May 18, 2005, without response.

Tan Chew Keong of SIG^2 Vulnerability Research reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system with Local System privileges.

A remote user can view files on the target system that are located outside of the TFTP directory.

Solution:   No solution was available at the time of this entry.
Vendor URL:  www.futuresoft.com/products/lit-tftp2000.htm (Links to External Site)
Cause:   Access control error, Boundary error, Input validation error
Underlying OS:  Windows (NT), Windows (2000), Windows (XP)

Message History:   None.


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