How the CVE Works:
CVE-2025-25302 is a critical vulnerability in Rembg versions 2.0.57 and earlier. The issue stems from a misconfigured Cross-Origin Resource Sharing (CORS) middleware. The server incorrectly reflects all origins in the `Access-Control-Allow-Origin` header, allowing any website to send cross-site requests to the Rembg server. This misconfiguration enables unauthorized websites to query the Rembg API without restrictions. Additionally, the `allow_credentials` flag is set to True, which means authenticated cross-site requests can also be made if authentication is enabled. This vulnerability exposes the server to potential data exfiltration, unauthorized API access, and cross-site request forgery (CSRF) attacks.
DailyCVE Form:
Platform: Rembg
Version: 2.0.57 and earlier
Vulnerability: CORS Misconfiguration
Severity: Critical
Date: 03/03/2025
What Undercode Say:
Exploitation:
1. Exploit Code Example (Python):
import requests
target_url = "http://rembg-server/api/remove_background"
malicious_origin = "http://malicious-site.com"
headers = {
"Origin": malicious_origin,
"Content-Type": "application/json"
}
response = requests.post(target_url, headers=headers, json={"image": "base64_encoded_image"})
print(response.text)
2. Exploit Command:
Use a browser or script to send cross-origin requests to the Rembg server. The server will process requests from any origin due to the misconfigured CORS policy.
3. Impact:
- Unauthorized access to sensitive APIs.
- Potential data exfiltration.
- CSRF attacks leading to unauthorized actions.
Protection:
1. Patch the Vulnerability:
Upgrade to Rembg version 2.0.58 or later, where the CORS middleware is properly configured.
2. Manual Fix (Code Example):
Update the CORS configuration to restrict allowed origins:
from flask_cors import CORS app = Flask(<strong>name</strong>) CORS(app, origins=[bash], supports_credentials=False)
3. Mitigation Steps:
- Disable `allow_credentials` unless absolutely necessary.
- Validate and sanitize all incoming requests.
- Implement strict origin checks in the CORS policy.
4. Monitoring:
Use tools like `tcpdump` or `Wireshark` to monitor cross-origin requests:
sudo tcpdump -i eth0 port 80 -w cors_traffic.pcap
5. Testing:
Use tools like `OWASP ZAP` or `Burp Suite` to test for CORS misconfigurations:
zap-cli quick-scan --spider -r http://rembg-server
6. Logging:
Enable detailed logging to detect unauthorized cross-origin requests:
import logging logging.basicConfig(filename='cors_requests.log', level=logging.INFO)
7. Firewall Rules:
Restrict access to the Rembg server using firewall rules:
sudo ufw allow from 192.168.1.0/24 to any port 80
By following these steps, you can mitigate the risks associated with CVE-2025-25302 and secure your Rembg server against cross-origin attacks.
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-25302
Extra Source Hub:
Undercode
