CVE-2024-12842
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts via the 'keyword' parameter in Emlog Pro's /admin/user.php file, leading to cross-site scripting (XSS). It affects Emlog Pro users up to version 2.4.1. Attackers can exploit this remotely to potentially steal session cookies or perform actions on behalf of authenticated users.
💻 Affected Systems
- Emlog Pro
📦 What is this software?
Emlog by Emlog
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain administrative access, deface websites, or redirect users to malicious sites.
Likely Case
Session hijacking, credential theft, or defacement of vulnerable pages.
If Mitigated
Limited impact if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploit details are publicly disclosed in GitHub issues, making exploitation straightforward for attackers with basic web skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.2 or later
Vendor Advisory: https://github.com/emlog/emlog/issues/305
Restart Required: No
Instructions:
1. Backup your Emlog Pro installation and database. 2. Download the latest version from the official Emlog repository. 3. Replace the affected files, particularly /admin/user.php. 4. Verify the fix by checking the version in the admin panel.
🔧 Temporary Workarounds
Input Sanitization
allManually sanitize the 'keyword' parameter in /admin/user.php to prevent script injection.
Edit /admin/user.php and add input validation for the keyword parameter using htmlspecialchars() or similar functions.
Web Application Firewall (WAF)
allDeploy a WAF to block XSS payloads targeting the /admin/user.php endpoint.
Configure WAF rules to filter malicious scripts in the keyword parameter.
🧯 If You Can't Patch
- Restrict access to /admin/user.php using IP whitelisting or authentication hardening.
- Implement Content Security Policy (CSP) headers to mitigate XSS impact.
🔍 How to Verify
Check if Vulnerable:
Check if your Emlog Pro version is 2.4.1 or earlier by logging into the admin panel and viewing the version info.Check Version:
Check the admin dashboard or view the version in the Emlog Pro configuration files.Verify Fix Applied:
After patching, confirm the version is 2.4.2 or later and test the /admin/user.php endpoint with XSS payloads to ensure they are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /admin/user.php with script tags or JavaScript in the keyword parameter.
- Multiple failed login attempts followed by XSS payloads.
Network Indicators:
- HTTP requests containing malicious scripts in the keyword parameter to the admin endpoint.
SIEM Query:
source="web_logs" AND url="/admin/user.php" AND (keyword CONTAINS "<script>" OR keyword CONTAINS "javascript:")