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Category:   Application (File Transfer/Sharing)  >   vxTftpSrv Vendors:   Cambridge Computer Corp.
vxTftpSrv Filename Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1014912
SecurityTracker URL:
CVE Reference:   CVE-2005-3032   (Links to External Site)
Updated:  Jun 8 2008
Original Entry Date:  Sep 15 2005
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Exploit Included:  Yes  
Version(s): 1.7.0
Description:   A vulnerability was reported in vxTftpSrv. A remote user can execute arbitrary code on the target system.

A remote user can connect to the TFTP service and send a long filename to the server to cause the TFTP service to crash or execute arbitrary code. A filename longer than 512 bytes can trigger the overflow.

Seth Fogie of Airscanner Mobile Security reported this vulnerability.

The original advisory is available at:

Impact:   A remote user can cause the TFTP service to crash or execute arbitrary code.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (CE)

Message History:   None.

 Source Message Contents

Subject:  Airscanner Mobile Security Advisory #05081203: vxTftpSrv 1.7.0 Remote

Airscanner Mobile Security Advisory #05081203:
vxTftpSrv 1.7.0 Remote Code Execution Buffer Overflow Vulnerability 

vxTftpSrv 1.7.0

Tested on Windows Mobile Pocket PC 2003

Mobile device running Windows Mobile Pocket PC with vxTFTPSrv installed and running.

Seth Fogie
Airscanner Mobile Security
Mobile Antivirus Researchers Association
August 12 2005

Risk Level:
High. Remote attacker can execute code.

vxTftpSrv is a simple, easy to use, Trivial File Transfer Protocol Server (TFTP) program which can be used to transfer files to and
 from routers, switches, hubs and other network devices. vxTftpSrv is typically used by Network Administrators to configure such equipment.
 Due to a improperly checked strcat call, it is possible to injection and execute code remotely via a buffer overflow.

When a long file name (>512 bytes) is sent to the tftp server, a strcat function overflows the stack. When the subroutine is complete,
 the Program Counter is loaded from the stack, which results in a crash or remote code execution depending on the contents of the
 injected file name. 


Vendor Response:
Waiting response.

Copyright (c) 2005 Airscanner Corp.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written
 consent of Airscanner Corp. If you wish to reprint the whole or any part of this alert in any other medium other than electronically,
 please contact Airscanner Corp. for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information.
 Use of the information constitutes acceptance for use on an AS IS condition. There are no warranties with regard to this information.
 Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from
 use of, or reliance on, this information.


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