CVE-2020-23264
📋 TL;DR
This CSRF vulnerability in Fork-CMS allows attackers to trick logged-in administrators into performing unintended actions by crafting malicious requests. Any Fork-CMS installation with administrator users is affected, potentially leading to unauthorized administrative operations.
💻 Affected Systems
- Fork-CMS
📦 What is this software?
Fork Cms by Fork Cms
⚠️ Risk & Real-World Impact
Worst Case
Complete administrative takeover allowing attackers to modify content, install backdoors, change user permissions, or delete critical data.
Likely Case
Unauthorized content modification, user privilege escalation, or configuration changes by tricking administrators into clicking malicious links.
If Mitigated
No impact if proper CSRF tokens are implemented and validated for all state-changing requests.
🎯 Exploit Status
CSRF attacks are well-understood and easy to craft. Requires administrator authentication but no special privileges for attacker.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.8.2
Vendor Advisory: https://github.com/forkcms/forkcms/pull/3123
Restart Required: No
Instructions:
1. Backup your Fork-CMS installation and database. 2. Update to Fork-CMS version 5.8.2 or later. 3. Verify CSRF protection is enabled in configuration.
🔧 Temporary Workarounds
Implement CSRF tokens manually
allAdd CSRF token validation to all state-changing endpoints if unable to patch immediately
Use SameSite cookie attribute
allConfigure session cookies with SameSite=Strict attribute to limit cross-site requests
Set-Cookie: session=value; SameSite=Strict; Secure; HttpOnly
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block CSRF patterns
- Require re-authentication for sensitive administrative actions and implement double-submit cookie pattern
🔍 How to Verify
Check if Vulnerable:
Check Fork-CMS version in admin panel or via composer show forkcms/forkcmsCheck Version:
composer show forkcms/forkcms | grep versionsVerify Fix Applied:
Verify version is 5.8.2 or later and test CSRF protection by attempting to submit forms without valid tokens📡 Detection & Monitoring
Log Indicators:
- Multiple failed CSRF token validations
- Administrative actions from unexpected IPs or user agents
Network Indicators:
- HTTP POST requests to admin endpoints without Referer header or with external Referer
SIEM Query:
web.logs | where url contains "/backend/" and csrf_token = null and method = "POST"