How the CVE Works:
The vulnerability in Rembg 2.0.57 and earlier stems from a misconfigured Cross-Origin Resource Sharing (CORS) policy. The CORS middleware in Rembg incorrectly reflects all origins, allowing any external website to send cross-site requests to the Rembg server. This misconfiguration enables unauthorized websites to query the Rembg API, potentially accessing sensitive data or functionality. Additionally, the `allow_credentials` flag is set to True, which means authenticated cross-site requests can also be made, further escalating the risk. This flaw could lead to data breaches, unauthorized API access, and potential exploitation of other server-side vulnerabilities.
DailyCVE Form:
Platform: Rembg
Version: 2.0.57 and earlier
Vulnerability: CORS Misconfiguration
Severity: High
Date: Mar 11, 2025
What Undercode Say:
Exploitation:
1. Exploit Code Example:
fetch('https://rembg-server/api', {
method: 'GET',
credentials: 'include'
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));
This script demonstrates how an attacker can exploit the misconfigured CORS policy to access the Rembg API from any origin.
2. Exploit Command:
Use a browser or script to send cross-origin requests to the Rembg server. No special tools are required due to the open CORS policy.
Protection:
1. Fix Code Example:
Update the CORS middleware configuration to restrict origins:
from flask_cors import CORS app = Flask(<strong>name</strong>) CORS(app, origins=[bash], supports_credentials=False)
This ensures only trusted domains can access the API and disables credential sharing.
2. Mitigation Steps:
- Upgrade to Rembg version 2.0.58 or later, where the CORS misconfiguration is fixed.
- Regularly audit CORS policies in your applications.
- Disable `allow_credentials` unless explicitly required.
3. Testing Command:
Use tools like `curl` or browser developer tools to verify CORS headers:
curl -I -X OPTIONS -H "Origin: https://malicious-site.com" https://rembg-server/api
Ensure the response does not include `Access-Control-Allow-Origin: `.
4. Monitoring:
Implement logging for cross-origin requests to detect unauthorized access attempts.
5. Additional Security Measures:
- Use API gateways to enforce strict CORS policies.
- Implement rate limiting to prevent abuse of the API.
- Regularly update dependencies to avoid similar vulnerabilities.
By following these steps, you can mitigate the risks associated with CVE-2025-XXXX and secure your Rembg deployment.
References:
Reported By: https://github.com/advisories/GHSA-59qh-fmm7-3g9q
Extra Source Hub:
Undercode
