Exposed Help Files occur when application help documentation, manuals, or instructional files are publicly accessible without proper access control. While help files are intended to assist users, they may inadvertently contain sensitive information such as internal URLs, system architecture details, sample credentials, or configuration instructions. Attackers can use this information to map the application, identify potential vulnerabilities, and facilitate targeted attacks such as file inclusion, misconfiguration exploitation, or privilege escalation.

Common patterns leading to help file exposure:

• Deploying documentation, guides, or PDF/HTML help files to web-accessible directories.
• Including internal URLs, system paths, or sample configuration data in help content.
• Lack of authentication or access control for help resources intended for internal use.
• Backup copies of help files accessible in web root or development directories.

Impacts:

• Information Disclosure: Sensitive system, configuration, or application details can be exposed.
• Facilitates Reconnaissance: Attackers gain insight into application structure and functionality.
• Increased Attack Surface: Knowledge from help files can be used to identify vulnerable endpoints or misconfigurations.
• Compliance Violations: Exposure of internal information may breach regulatory requirements.

Detection indicators:

• Help files (e.g., .html, .pdf, .chm) accessible from public URLs.
• Documentation containing sensitive URLs, file paths, or credentials.
• Security scanners flagging help files in publicly accessible directories.

Mitigation focuses on restricting access and sanitizing content:

1. Restrict Access to Help Files
   Place internal help files behind authentication and authorization controls.

2. Sanitize Help Content
   Remove sensitive information, internal URLs, credentials, or configuration examples from publicly accessible files.

3. Move Documentation Out of Web Root
   Keep help files in directories not served publicly or restrict via web server rules.

4. Monitor and Audit Access
   Log access to help resources to detect unauthorized access attempts.

5. Use Encrypted Channels
   Serve documentation over HTTPS to prevent interception.

6. Review Deployment Pipelines
   Ensure that help files deployed to production are verified for sensitive content.

7. Security Testing
   Include checks for exposed documentation and help files during penetration tests.

• Exposed Help Files
• CWE 200: Exposure of Sensitive Information
• CAPEC 152: Malicious File Discovery
• WASC 33: File Inclusion / Disclosure
• CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N