This issue requires manual confirmation.

Internal IP Address Disclosure occurs when web applications or server responses reveal internal network addresses, hostnames, or private infrastructure details. This information can be exposed through HTTP headers (e.g., X-Forwarded-For, Via), error messages, comments, or configuration files. Attackers can leverage internal IPs to map network topology, identify private services, or plan targeted attacks such as lateral movement, SSRF (Server-Side Request Forgery), or internal network exploitation.

Common patterns leading to internal IP disclosure:

• Inclusion of internal IPs in HTTP headers or response bodies.
• Verbose error messages displaying server IPs or network configurations.
• Comments in HTML, JavaScript, or configuration files containing internal addresses.
• Misconfigured proxies or reverse proxies revealing internal infrastructure.

Impacts:

• Network Reconnaissance: Attackers can map internal networks and identify reachable hosts.
• Facilitates Targeted Attacks: Knowledge of internal IPs may aid SSRF, RCE, or other network-based attacks.
• Increased Attack Surface: Exposed infrastructure details allow attackers to focus on vulnerable internal services.
• Compliance Risks: Disclosure of internal network details may violate organizational security policies.

Detection indicators:

• HTTP responses containing internal IP addresses or hostnames.
• Security scanners flagging private IPs returned in server responses.
• Publicly accessible documentation or files revealing internal network information.

Mitigation focuses on masking internal network details and secure server configuration:

1. Remove Internal IPs from Responses
   Do not expose internal addresses in HTTP headers, error messages, or HTML content.

2. Configure Proxies Properly
   Ensure reverse proxies or load balancers do not leak internal IPs in headers like X-Forwarded-For.

3. Sanitize Error Messages and Logs
   Display generic messages to users and log detailed network information internally.

4. Review and Remove Comments
   Avoid including network or IP information in HTML, JavaScript, or configuration comments.

5. Monitor and Audit Network Exposure
   Regularly scan for any inadvertent internal IP disclosures.

6. Security Testing
   Include internal IP discovery and SSRF testing during penetration tests.

7. Educate Developers and Administrators
   Raise awareness about risks of exposing internal infrastructure and network addresses.

CWE-200: Exposure of Sensitive Information