Headline

GHSA-xx95-62h6-h7v3: lgsl Stored Cross-Site Scripting vulnerability

Summary

A stored cross-site scripting (XSS) vulnerability was identified in lgsl. The issue arises from improper sanitation of user input. Everyone who accesses this page will be affected by this attack.

Details

The function lgsl_query_40 in lgsl_protocol.php has implemented an HTTP crawler. This function makes a request to the registered game server, and upon crawling the malicious /info endpoint with our payload, will render our javascript on the info page. This information is being displayed via lgsl_details.php

Affected Code:

      foreach ($server['e'] as $field => $value) {
        $value = preg_replace('/((https*:\/\/|https*:\/\/www\.|www\.)[\w\d\.\-\/=$?]*)/i', "<a href='$1' target='_blank'>$1</a>", html_entity_decode($value));
        $output .= "
        <tr><td> {$field} </td><td> {$value} </td></tr>";
      }

PoC

Create a game server with type eco and set the target host and port accordingly to your ttack server. I have crafted this json payload that is being parsed according to the schema and being served on /info
Serve the following JSON payload at /info on your handler

{
  "Animals": "1",
  "EconomyDesc": "<img src=x onerror=prompt(1)>"
}

Access the corresponding server info page at /s?=. Upon refreshing & crawling our server, it should execute our javascript.

23 hours ago

ghsa

Open in Source

#xss #vulnerability #js #git #java #php

GitHub Advisory Database
GitHub Reviewed
CVE-2024-56361

lgsl Stored Cross-Site Scripting vulnerability

High severity GitHub Reviewed Published Dec 25, 2024 in tltneon/lgsl • Updated Dec 27, 2024

Package

Affected versions

< 7.0.0

Summary

A stored cross-site scripting (XSS) vulnerability was identified in lgsl. The issue arises from improper sanitation of user input. Everyone who accesses this page will be affected by this attack.

Details

The function lgsl_query_40 in lgsl_protocol.php has implemented an HTTP crawler. This function makes a request to the registered game server, and upon crawling the malicious /info endpoint with our payload, will render our javascript on the info page. This information is being displayed via lgsl_details.php

Affected Code:

  foreach ($server\['e'\] as $field => $value) {
    $value = preg\_replace('/((https\*:\\/\\/|https\*:\\/\\/www\\.|www\\.)\[\\w\\d\\.\\-\\/=$?\]\*)/i', "<a href='$1' target='\_blank'>$1</a>", html\_entity\_decode($value));
    $output .= "
    <tr><td> {$field} </td><td> {$value} </td></tr>";
  }

PoC

Create a game server with type eco and set the target host and port accordingly to your ttack server. I have crafted this json payload that is being parsed according to the schema and being served on /info
Serve the following JSON payload at /info on your handler

{ "Animals": "1", "EconomyDesc": “<img src=x onerror=prompt(1)>” }