module

Rconfig 3.x Chained Remote Code Execution

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Disclosed
2020-03-11
Created
2020-03-16

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 ;-)

Authors

Jean-Pascal Thomas
Orange Cyberdefense

Platform

Linux,Unix

Architectures

cmd

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
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