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CVE-2023-36845

Status Candidate

Overview

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 remotely execute code. Using a crafted request which sets the variable PHPRC an attacker is able to modify the PHP execution environment allowing the injection und execution of code. This issue affects Juniper Networks Junos OS on EX Series and SRX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; * 22.4 versions prior to 22.4R2-S1, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.

Related Files

Juniper SRX Firewall / EX Switch Remote Code Execution
Posted Feb 2, 2024
Authored by whiteOwl | Site whiteowl-pub.github.io

This code serves as both a vulnerability detector and a proof of concept for CVE-2023-36845. It executes the phpinfo() function on the login page of the target device, allowing to inspect the PHP configuration. This script also has the option to save the phpinfo() output to a file for further analysis.

tags | exploit, php, proof of concept
advisories | CVE-2023-36845
SHA-256 | 56c0a0ad9dba5be91bcf88dbed7e2234e764bf5d6166e8250dfe5f1920543e02
Juniper SRX Firewall / EX Switch Remote Code Execution
Posted Oct 2, 2023
Authored by Ron Bowes, Jacob Baines, jheysel-r7 | Site metasploit.com

This Metasploit module exploits a PHP environment variable manipulation vulnerability affecting Juniper SRX firewalls and EX switches. The affected Juniper devices running FreeBSD and every FreeBSD process can access their stdin by opening /dev/fd/0. The exploit also makes use of two useful PHP features. The first being auto_prepend_file which causes the provided file to be added using the require function. The second PHP function is allow_url_include which allows the use of URL-aware fopen wrappers. By enabling allow_url_include, the exploit can use any protocol wrapper with auto_prepend_file. The module then uses data:// to provide a file inline which includes the base64 encoded PHP payload. By default this exploit returns a session confined to a FreeBSD jail with limited functionality. There is a datastore option JAIL_BREAK, that when set to true, will steal the necessary tokens from a user authenticated to the J-Web application, in order to overwrite the root password hash. If there is no user authenticated to the J-Web application this method will not work. The module then authenticates with the new root password over SSH and then rewrites the original root password hash to /etc/master.passwd.

tags | exploit, web, root, php, protocol
systems | freebsd, bsd, juniper
advisories | CVE-2023-36845
SHA-256 | 23552b23e1cc0e2022181944f8894c8f7203e6893e7d1127561c3ffd867b9517
Juniper JunOS SRX / EX Remote Code Execution
Posted Aug 30, 2023
Authored by watchTowr Labs Team | Site github.com

A proof of concept exploit for chaining four CVEs to achieve remote code execution in Juniper JunOS within SRX and EX Series products.

tags | exploit, remote, code execution, proof of concept
systems | juniper
advisories | CVE-2023-36844, CVE-2023-36845, CVE-2023-36846, CVE-2023-36847
SHA-256 | ab0b70a7cc6a4a947d8faceced29674fb6ad7bf45e8a329120e642cb825e3c05
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