Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    863569367

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: LibreNMS 1.46 - 'search' SQL Injection
# Google Dork:unknown
# Date: 2019-09-01
# Exploit Author: Punt
# Vendor Homepage: https://www.librenms.org
# Software Link: https://www.librenms.org 
# Version:1.46 and less
# Tested on:Linux and Windows
# CVE: N/A 

#Affected Device: more than 4k found on Shodan and Censys. 

#Description about the bug
Vunlerable script /html/ajax_serarch.php

if (isset($_REQUEST['search'])) {
    $search = mres($_REQUEST['search']);
    header('Content-type: application/json');
    if (strlen($search) > 0) {
        $found = 0;

        if ($_REQUEST['type'] == 'group') {
            include_once '../includes/device-groups.inc.php';
            foreach (dbFetchRows("SELECT id,name FROM device_groups WHERE name LIKE '%".$search."%'") as $group) {
                if ($_REQUEST['map']) {
                    $results[] = array(
                        'name'     => 'g:'.$group['name'],
                        'group_id' => $group['id'],


as you can there is a search parameter $search = mres($_REQUEST['search']); which accepts a user input using $_REQUEST['']

dbFetchRows() used to exectute sql query

now lets check the mres() function 

the mres() fuction is located under /includes/common.php

function mres($string)
{
    return $string; // 
    global $database_link;
    return mysqli_real_escape_string($database_link, $string);

as you can see the mres() function call's the mysqli_real_escape_string() which can be bypassed by '%'                    


#POC:
1st lgoin to your LibreNMS
2nd go to this /ajax_search.php?search=%27&type=group or /ajax_search.php?search=%27&type=alert-rules 
3rd you will see an sql syntax error 

The Librenms team have applyed a patch .
Thanks
Punt (From Ethiopia)