CVE-2021-44122
📋 TL;DR
SPIP 4.0.0 has a CSRF vulnerability in multiple PHP files that allows authenticated attackers to execute malicious actions without user consent. Attackers can exploit this by tricking users into visiting malicious websites or combining it with XSS vulnerabilities. This affects SPIP 4.0.0 installations with authenticated user access.
💻 Affected Systems
- SPIP
📦 What is this software?
Spip by Spip
⚠️ Risk & Real-World Impact
Worst Case
Authenticated attackers could execute arbitrary code, modify content, change configurations, or perform administrative actions leading to complete system compromise.
Likely Case
Attackers could modify website content, create backdoors, steal session cookies, or perform unauthorized administrative actions.
If Mitigated
With proper CSRF tokens and same-site cookie policies, exploitation becomes significantly more difficult but not impossible if XSS vulnerabilities exist.
🎯 Exploit Status
Exploitation requires authenticated user sessions and either malicious website redirection or XSS combination.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 1b8e4f404c2441c15ca6540b9a6d8e50cff219db
Vendor Advisory: https://git.spip.net/spip/spip/commit/1b8e4f404c2441c15ca6540b9a6d8e50cff219db
Restart Required: No
Instructions:
1. Update SPIP to latest version. 2. Apply the specific patch from the git commit. 3. Verify CSRF protection is enabled in all forms.
🔧 Temporary Workarounds
Implement CSRF Tokens
allAdd CSRF tokens to all forms and validate them server-side
SameSite Cookie Policy
allSet SameSite=Strict or Lax on session cookies
session.cookie_samesite = Strict
🧯 If You Can't Patch
- Implement web application firewall rules to detect CSRF patterns
- Restrict authenticated user permissions to minimum necessary
🔍 How to Verify
Check if Vulnerable:
Check if running SPIP 4.0.0 and examine affected files for CSRF protectionCheck Version:
Check SPIP configuration files or admin panel for version informationVerify Fix Applied:
Verify SPIP version is updated and test forms for CSRF token implementation📡 Detection & Monitoring
Log Indicators:
- Multiple form submissions without referrer headers
- Unexpected administrative actions from user sessions
Network Indicators:
- Requests from unexpected origins with authenticated session cookies
SIEM Query:
source_ip NOT IN trusted_ips AND (uri CONTAINS 'aiguiller.php' OR uri CONTAINS 'balises.php') AND status=200