Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

While performing a black-box assessment you run an Nmap version and NSE script scan against a target and receive the following excerpt:

PORT   STATE SERVICE VERSION
80/tcp open  http    Microsoft IIS httpd 7.5
| http-methods:
|   Supported Methods: GET HEAD POST OPTIONS PROPFIND SEARCH LOCK UNLOCK COPY MOVE DELETE
|_  Potentially risky methods: PROPFIND SEARCH LOCK UNLOCK COPY MOVE DELETE

Based on the extra HTTP verbs that are accepted, which built-in IIS feature is most likely enabled, and what is the primary risk if it is left unrestricted?

  • WebDAV publishing extension; it can let an attacker upload, move, or delete files on the web root if access controls are weak.

  • ISAPI filters; they could enable kernel-level buffer overflow exploits against custom DLLs.

  • Application Request Routing (ARR) proxy; it could leak internal host information through reverse-proxy misconfiguration.

  • The CGI module; it exposes the server to arbitrary code execution through poorly written scripts.

Certified Ethical Hacker (CEH)
Web Application Hacking
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