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Rconfig 3.x Chained Remote Code Execution

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Rconfig 3.x Chained Remote Code Execution

Disclosed
03/11/2020
Created
03/16/2020

Description

This module exploits multiple vulnerabilities in rConfig version 3.9 in order to execute arbitrary commands. This module takes advantage of a command injection vulnerability in the `path` parameter of the ajax archive file functionality within the rConfig web interface in order to execute the payload. Valid credentials for a user with administrative privileges are required. However, this module can bypass authentication via SQLI. This module has been successfully tested on Rconfig 3.9.3 and 3.9.4. The steps are: 1. SQLi on /commands.inc.php allows us to add an administrative user. 2. An authenticated session is established with the newly added user 3. Command Injection on /lib/ajaxHandlers/ajaxArchiveFiles.php allows us to execute the payload. 4. Remove the added admin user. Tips : once you get a shell, look at the CVE-2019-19585. You will probably get root because rConfig install script add Apache user to sudoers with nopasswd ;-)

Author(s)

  • Jean-Pascal Thomas
  • Orange Cyberdefense

Platform

Linux,Unix

Architectures

cmd

Development

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/linux/http/rconfig_ajaxarchivefiles_rce
msf exploit(rconfig_ajaxarchivefiles_rce) > show targets
    ...targets...
msf exploit(rconfig_ajaxarchivefiles_rce) > set TARGET < target-id >
msf exploit(rconfig_ajaxarchivefiles_rce) > show options
    ...show and set options...
msf exploit(rconfig_ajaxarchivefiles_rce) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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