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OpenVPN Host Header Injection

ID: openvpn-hhi

Severity: info

Author: twitter.com/Dheerajmadhukar

Tags: openvpn,hostheader-injection

Description

Section titled “Description”

A vulnerability in OpenVPN Access Server allows remote attackers to inject arbitrary redirection URLs by using the ‘Host’ HTTP header field.

YAML Source

Section titled “YAML Source”
id: openvpn-hhi


info:
  name: OpenVPN Host Header Injection
  author: twitter.com/Dheerajmadhukar
  severity: info
  description: A vulnerability in OpenVPN Access Server allows remote attackers to inject arbitrary redirection URLs by using the 'Host' HTTP header field.
  metadata:
    max-request: 1
  tags: openvpn,hostheader-injection


http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{randstr}}.tld


    matchers-condition: and
    matchers:
      - type: word
        words:
          - "https://{{randstr}}.tld/__session_start__/"
          - "openvpn_sess"
        part: header
        condition: and


      - type: status
        status:
          - 302
# digest: 490a0046304402202aa4bdf6acd9b0dda315a4734cfcafbe504a8078187a553fba71bc5d570e59c402203c8427d37adbfef957a10d49eb025772b021a7ab0195d1419526116004814604:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/vulnerabilities/other/openvpn-hhi.yaml"

View on Github