OpenZiti, Server-Side Request Forgery (SSRF), CVE-2025-27501 (Critical)

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How the Mentioned CVE Works:

CVE-2025-27501 is a critical Server-Side Request Forgery (SSRF) vulnerability in OpenZiti, a zero-trust application framework. The vulnerability exists in the admin panel’s endpoint, which lacks authentication and accepts user-supplied URL parameters. Attackers can exploit this by sending crafted requests to the OpenZiti Controller, forcing the server to perform unauthorized internal or external requests. This can lead to sensitive data exposure, internal network reconnaissance, or further exploitation of internal systems. The issue arises because the server-side request is made with the node’s identity, potentially granting additional permissions. The vulnerability is fixed in version 3.7.1 by moving the request handling to the client side, removing the server’s role in the process.

DailyCVE Form:

Platform: OpenZiti
Version: < 3.7.1
Vulnerability: SSRF
Severity: Critical
Date: 03/03/2025

(End of form)

What Undercode Say:

Exploitation:

  1. Craft Malicious URL: Attackers can craft a URL pointing to internal or external resources.
  2. Send Request: Use the vulnerable endpoint to send the crafted URL.
  3. Exploit Internal Systems: Gain access to internal services or sensitive data.

Protection:

  1. Update to 3.7.1: Upgrade OpenZiti to the fixed version.

2. Input Validation: Sanitize and validate user-supplied URLs.

  1. Authentication: Ensure all admin endpoints require proper authentication.

Commands:

1. Check Version:

ziti --version

2. Upgrade OpenZiti:

sudo apt-get update && sudo apt-get install ziti

Code Snippet (Input Validation):

import re
def validate_url(url):
if not re.match(r'^https?://(?:[-\w.]|(?:%[\da-fA-F]{2}))+', url):
raise ValueError("Invalid URL")
return url

References:

  1. OpenZiti GitHub Repository
  2. CVE-2025-27501 Details
  3. SSRF Prevention Cheat Sheet

Analytics:

  • CVSS Score: 9.8 (Critical)
  • Attack Vector: Network
  • Exploitability: High
  • Impact: Confidentiality, Integrity, Availability

Tools:

1. Burp Suite: Test for SSRF vulnerabilities.

2. Nmap: Scan internal networks post-exploitation.

3. Metasploit: Exploit SSRF vulnerabilities.

Mitigation Steps:

1. Network Segmentation: Limit internal network access.

  1. Web Application Firewall (WAF): Deploy WAF to block malicious requests.

3. Log Monitoring: Monitor logs for unusual requests.

By following these steps, organizations can mitigate the risks associated with CVE-2025-27501 and protect their systems from SSRF attacks.

References:

Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-27501
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