CVE-2024-55556
📋 TL;DR
CVE-2024-55556 is a critical remote command execution vulnerability in Crater Invoice that allows unauthenticated attackers to execute arbitrary code on the server by manipulating Laravel session cookies when they have obtained the APP_KEY. This affects all Crater Invoice installations where the APP_KEY is exposed or compromised. Attackers can achieve full server compromise through arbitrary deserialization of manipulated session data.
💻 Affected Systems
- Crater Invoice
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover with administrative access, data theft, ransomware deployment, and lateral movement to other systems.
Likely Case
Server compromise leading to data exfiltration, cryptocurrency mining, or backdoor installation for persistent access.
If Mitigated
Limited impact if APP_KEY is properly secured and not exposed, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Exploitation requires APP_KEY knowledge; once obtained, exploitation is straightforward using Laravel's session manipulation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://github.com/crater-invoice/crater
Restart Required: Yes
Instructions:
1. Update to latest Crater Invoice version. 2. Regenerate APP_KEY using 'php artisan key:generate'. 3. Restart web server and queue workers. 4. Invalidate all existing sessions.
🔧 Temporary Workarounds
APP_KEY Protection
allSecure APP_KEY by ensuring it's not exposed in logs, environment files, or version control. Rotate APP_KEY immediately if suspected exposure.
php artisan key:generate
Session Validation
allImplement additional session validation middleware to detect tampered session cookies.
🧯 If You Can't Patch
- Immediately rotate APP_KEY using 'php artisan key:generate' and invalidate all sessions
- Implement WAF rules to block requests with malformed laravel_session cookies and monitor for APP_KEY exposure attempts
🔍 How to Verify
Check if Vulnerable:
Check if APP_KEY is exposed in .env files, logs, or public repositories. Review Laravel session handling configuration.Check Version:
Check Crater Invoice version in admin panel or via composer show crater-invoice/craterVerify Fix Applied:
Verify APP_KEY has been rotated and test that manipulated session cookies are rejected. Check application logs for deserialization errors.📡 Detection & Monitoring
Log Indicators:
- Laravel deserialization errors
- Unexpected session data manipulation
- Failed session validation attempts
- APP_KEY exposure in logs
Network Indicators:
- Multiple failed session validation requests
- Unusual cookie manipulation patterns
- Requests with specially crafted laravel_session cookies
SIEM Query:
source="web_logs" AND ("Deserialization error" OR "Invalid session data" OR "APP_KEY")