Rapid7’s 2026 Global Cybersecurity Summit is now available on-demand.Watch sessions.
Rapid7

module

Klog Server authenticate.php user Unauthenticated Command Injection

Try Surface Command
Back to search
Disclosed
Dec 27, 2020
Created
Feb 13, 2021

Description

This module exploits an unauthenticated command injection vulnerability
in Klog Server versions 2.4.1 and prior.

The `authenticate.php` file uses the `user` HTTP POST parameter in a call
to the `shell_exec()` PHP function without appropriate input validation,
allowing arbitrary command execution as the apache user.

The sudo configuration permits the apache user to execute any command
as root without providing a password, resulting in privileged command
execution as root.

This module has been successfully tested on Klog Server version 2.4.1
virtual appliance.

Authors

b3kc4t
Metin Yunus Kandemir
bcoles [email protected]

Platform

Linux,Unix

Architectures

x86, x64, 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/klog_server_authenticate_user_unauth_command_injection
    msf exploit(klog_server_authenticate_user_unauth_command_injection) > show targets
        ...targets...
    msf exploit(klog_server_authenticate_user_unauth_command_injection) > set TARGET < target-id >
    msf exploit(klog_server_authenticate_user_unauth_command_injection) > show options
        ...show and set options...
    msf exploit(klog_server_authenticate_user_unauth_command_injection) > exploit
Title
Rapid7 Labs

2026 Global Threat Landscape Report

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.

Get report