CVE-2025-62607

Executive Summary

CVE-2025-62607 is a low-severity information disclosure vulnerability in the Nautobot Single Source of Truth (SSoT) application. An unauthenticated attacker can access a configuration page that reveals the ServiceNow public instance name (e.g., companyname.service-now.com). This exposure is considered low-value as it does not leak secrets, usernames, or passwords. The vulnerability is patched in version 3.10.0.

Supply Chain & Package Security

This vulnerability affects the Nautobot SSoT Python package, distributed via PyPI. Organizations using this package should verify their dependency version and update to 3.10.0 or later. No malicious package versions have been reported.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low (ServiceNow instance name)
• Integrity Impact: None
• Availability Impact: None

Threat Level: Low. The exposed information is low-value and does not enable further exploitation without additional credentials.

Deep Dive & Mechanics

The Nautobot SSoT app provides a configuration page for ServiceNow integration. Prior to version 3.10.0, this page was accessible without authentication. The page displays the ServiceNow instance name (e.g., companyname.service-now.com) but does not expose the associated secret name, secret value, username, or password. An unauthenticated attacker can view this page but cannot modify the instance name or set a secret. The vulnerability is limited to this single page; other Nautobot pages remain protected.

The root cause is a missing authentication check on the configuration endpoint. The fix in version 3.10.0 adds proper access controls to this page.

Vulnerable vs. Patched Code

Vulnerable (pre-3.10.0): The configuration view likely lacked a @login_required decorator or similar authentication check.

# Vulnerable view (conceptual)
class ServiceNowConfigView(View):
    def get(self, request):
        # No authentication check
        instance_name = get_service_now_instance_name()
        return render(request, 'config.html', {'instance_name': instance_name})

Patched (3.10.0): The patched version adds authentication enforcement.

# Patched view (conceptual)
from django.contrib.auth.mixins import LoginRequiredMixin

class ServiceNowConfigView(LoginRequiredMixin, View):
    def get(self, request):
        instance_name = get_service_now_instance_name()
        return render(request, 'config.html', {'instance_name': instance_name})

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target running Nautobot SSoT < 3.10.0
• Network access to the Nautobot web interface

Steps:

1. Identify the target Nautobot instance.
2. Access the unauthenticated configuration page:

   GET /api/plugins/ssot/service-now/config/ HTTP/1.1
   Host: target-nautobot.example.com
   

3. Parse the response for the ServiceNow instance name (e.g., companyname.service-now.com).

Example cURL:

curl -s http://target-nautobot.example.com/api/plugins/ssot/service-now/config/ | grep -oP '"instance_name":"[^"]+"'

Blue Team

Detection:

• Monitor for unauthenticated access to /api/plugins/ssot/service-now/config/ or similar endpoints.
• Alert on any access to this endpoint from IPs not associated with authenticated users.

Hunting:

• Review web server logs for requests to the SSoT configuration endpoint without prior authentication.
• Check for anomalous access patterns, such as repeated requests from the same IP.

Indicators of Compromise (IOCs)

• URL Pattern: /api/plugins/ssot/service-now/config/
• HTTP Response Body: Contains "instance_name" field with a ServiceNow domain.
• Log Entry: GET /api/plugins/ssot/service-now/config/ from an unauthenticated source.

Detection Engineering

YARA Rule

rule CVE_2025_62607_ServiceNow_Instance_Leak {
    meta:
        description = "Detects exposure of ServiceNow instance name in Nautobot SSoT config"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-62607"
    strings:
        $instance = /"instance_name":"[a-zA-Z0-9._-]+\.service-now\.com"/
        $config_path = "/api/plugins/ssot/service-now/config/"
    condition:
        $instance and $config_path
}

Sigma Rule

title: Nautobot SSoT Unauthenticated ServiceNow Config Access
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated access to the Nautobot SSoT ServiceNow configuration page
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-62607
logsource:
    category: webserver
    product: nginx
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem: '/api/plugins/ssot/service-now/config/'
    condition: selection
falsepositives:
    - Legitimate authenticated users (if authentication is not enforced)
level: low

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-62607 Nautobot SSoT Unauthenticated ServiceNow Config Access"; flow:to_server,established; content:"GET"; http_method; content:"/api/plugins/ssot/service-now/config/"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate:

• Upgrade Nautobot SSoT to version 3.10.0 or later.
• If immediate upgrade is not possible, restrict access to the configuration endpoint via web application firewall (WAF) rules or network ACLs.

Long-term:

• Implement authentication checks on all API endpoints.
• Conduct regular security reviews of third-party plugins.
• Monitor for similar information disclosure vulnerabilities.

Valters IT