CVE-2023-53883
📋 TL;DR
CVE-2023-53883 is a remote code execution vulnerability in Webedition CMS v2.9.8.8 that allows authenticated attackers to execute arbitrary system commands by injecting malicious code into PHP page descriptions. This affects all organizations running vulnerable versions of Webedition CMS with authenticated user access.
💻 Affected Systems
- Webedition CMS
📦 What is this software?
Webedition Cms by Webedition
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attackers to install malware, steal data, pivot to internal networks, or establish persistent backdoors.
Likely Case
Data exfiltration, website defacement, or cryptocurrency mining through command execution.
If Mitigated
Limited impact if proper authentication controls, input validation, and network segmentation are implemented.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB (ID: 51661), making exploitation straightforward for attackers with valid credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references
Vendor Advisory: https://www.webedition.org/
Restart Required: No
Instructions:
1. Check Webedition.org for security updates. 2. If no patch is available, implement workarounds immediately. 3. Consider upgrading to a newer, supported version if available.
🔧 Temporary Workarounds
Disable PHP Page Creation
allRemove or restrict permissions for creating PHP pages in the CMS admin interface.
Input Validation Filter
allImplement server-side input validation to block system command injection in description fields.
Modify PHP code to sanitize inputs using functions like escapeshellarg() and htmlspecialchars()
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for CMS admin accounts.
- Deploy web application firewall (WAF) rules to detect and block command injection attempts.
🔍 How to Verify
Check if Vulnerable:
Check if running Webedition CMS v2.9.8.8 by reviewing the CMS version in admin panel or configuration files.Check Version:
Check CMS admin dashboard or config files for version information.Verify Fix Applied:
Test if PHP page creation with system commands in description field is blocked after implementing workarounds.📡 Detection & Monitoring
Log Indicators:
- Unusual PHP file creation events
- System command execution in web server logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Outbound connections to suspicious IPs from web server
- Unusual POST requests to page creation endpoints
SIEM Query:
source="web_server.log" AND ("system(" OR "exec(" OR "shell_exec(") AND "POST /admin/create_page.php"