CVE-2024-2594
📋 TL;DR
CVE-2024-2594 is a Cross-Site Scripting (XSS) vulnerability in AMSS++ version 4.31 that allows remote attackers to inject malicious scripts via multiple parameters in the admin interface. This could enable session cookie theft when authenticated users visit specially crafted URLs. Organizations running AMSS++ 4.31 are affected.
💻 Affected Systems
- AMSS++
📦 What is this software?
Amss\+\+ by Amss\+\+ Project
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of admin accounts leading to unauthorized access, data theft, privilege escalation, and potential full system compromise if admin credentials are reused.
Likely Case
Session hijacking of authenticated admin users, allowing attackers to perform unauthorized actions within the AMSS++ application.
If Mitigated
Limited impact with proper input validation, output encoding, and security controls in place.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into visiting malicious URLs
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-amssplus-amss
Restart Required: No
Instructions:
1. Check vendor for updated version
2. Apply input validation and output encoding
3. Implement Content Security Policy headers
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation for all parameters in /amssplus/admin/index.php
# Add input sanitization in PHP code
$clean_input = htmlspecialchars($_GET['parameter'], ENT_QUOTES, 'UTF-8');
Content Security Policy
allImplement CSP headers to prevent script execution from untrusted sources
# Add to .htaccess or web server config
Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
# PHP implementation
header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Restrict access to /amssplus/admin/ to trusted IP addresses only
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Test by attempting to inject script payloads into parameters of /amssplus/admin/index.php and checking if they executeCheck Version:
# Check AMSS++ version in admin interface or configuration filesVerify Fix Applied:
Verify that script payloads are properly encoded and do not execute when submitted📡 Detection & Monitoring
Log Indicators:
- Unusual parameter values containing script tags or JavaScript in /amssplus/admin/index.php access logs
- Multiple failed login attempts followed by successful admin access
Network Indicators:
- HTTP requests to /amssplus/admin/index.php with suspicious parameter values
- Outbound connections to unknown domains from admin sessions
SIEM Query:
source="web_access_logs" AND uri="/amssplus/admin/index.php" AND (param="<script>" OR param="javascript:")