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Files from Datacut

First Active2012-04-20
Last Active2012-04-20
TFTP Server for Windows 1.4 ST WRQ Buffer Overflow
Posted Apr 20, 2012
Authored by Mati Aharoni, Datacut | Site metasploit.com

This Metasploit module exploits a vulnerability found in TFTP Server 1.4 ST. The flaw is due to the way TFTP handles the filename parameter extracted from a WRQ request. The server will append the user-supplied filename to TFTP server binary's path without any bounds checking, and then attempt to open this with a fopen(). Since this isn't a valid file path, fopen() returns null, which allows the corrupted data to be used in a strcmp() function, causing an access violation. Since the offset is sensitive to how the TFTP server is launched, you must know in advance if your victim machine launched the TFTP as a 'Service' or 'Standalone' , and then manually select your target accordingly. A successful attempt will lead to remote code execution under the context of SYSTEM if run as a service, or the user if run as a standalone. A failed attempt will result a denial-of-service.

tags | exploit, remote, code execution
advisories | CVE-2008-1611, OSVDB-43785
SHA-256 | 97a2a64a4d7b26a5088cf3d73076bee782c41a2cccb84de4ec3d8a09cc34adad
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