Basic HTTP

Learn about using Basic HTTP with Nuclei

Nuclei offers extensive support for various features related to HTTP protocol. Raw and Model based HTTP requests are supported, along with options Non-RFC client requests support too. Payloads can also be specified and raw requests can be transformed based on payload values along with many more capabilities that are shown later on this Page.

HTTP Requests start with a request block which specifies the start of the requests for the template.

# Start the requests for the template right here
http:

Method

Request method can be GET, POST, PUT, DELETE, etc. depending on the needs.

# Method is the method for the request
method: GET

Redirects

Redirection conditions can be specified per each template. By default, redirects are not followed. However, if desired, they can be enabled with redirects: true in request details. 10 redirects are followed at maximum by default which should be good enough for most use cases. More fine grained control can be exercised over number of redirects followed by using max-redirects field.

An example of the usage:

http:
  - method: GET
    path:
      - "{{BaseURL}}/login.php"
    redirects: true
    max-redirects: 3

Currently redirects are defined per template, not per request.

Path

The next part of the requests is the path of the request path. Dynamic variables can be placed in the path to modify its behavior on runtime.

Variables start with {{ and end with }} and are case-sensitive.

{{BaseURL}} - This will replace on runtime in the request by the input URL as specified in the target file.

{{RootURL}} - This will replace on runtime in the request by the root URL as specified in the target file.

{{Hostname}} - Hostname variable is replaced by the hostname including port of the target on runtime.

{{Host}} - This will replace on runtime in the request by the input host as specified in the target file.

{{Port}} - This will replace on runtime in the request by the input port as specified in the target file.

{{Path}} - This will replace on runtime in the request by the input path as specified in the target file.

{{File}} - This will replace on runtime in the request by the input filename as specified in the target file.

{{Scheme}} - This will replace on runtime in the request by protocol scheme as specified in the target file.

An example is provided below - https://example.com:443/foo/bar.php

Variable	Value
{{BaseURL}}	https://example.com:443/foo/bar.php
{{RootURL}}	https://example.com:443
{{Hostname}}	example.com:443
{{Host}}	example.com
{{Port}}	443
{{Path}}	/foo
{{File}}	bar.php
{{Scheme}}	https

Some sample dynamic variable replacement examples:

path: "{{BaseURL}}/.git/config"
# This path will be replaced on execution with BaseURL
# If BaseURL is set to  https://abc.com then the
# path will get replaced to the following: https://abc.com/.git/config

Multiple paths can also be specified in one request which will be requested for the target.

Headers

Headers can also be specified to be sent along with the requests. Headers are placed in form of key/value pairs. An example header configuration looks like this:

# headers contain the headers for the request
headers:
  # Custom user-agent header
  User-Agent: Some-Random-User-Agent
  # Custom request origin
  Origin: https://google.com

Body

Body specifies a body to be sent along with the request. For instance:

# Body is a string sent along with the request
body: "{\"some random JSON\"}"

# Body is a string sent along with the request
body: "admin=test"

Session

To maintain a cookie-based browser-like session between multiple requests, cookies are reused by default. This is beneficial when you want to maintain a session between a series of requests to complete the exploit chain or to perform authenticated scans. If you need to disable this behavior, you can use the disable-cookie field.

# disable-cookie accepts boolean input and false as default
disable-cookie: true

Request Condition

Request condition allows checking for the condition between multiple requests for writing complex checks and exploits involving various HTTP requests to complete the exploit chain.

The functionality will be automatically enabled if DSL matchers/extractors contain numbers as a suffix with respective attributes.

For example, the attribute status_code will point to the effective status code of the current request/response pair in elaboration. Previous responses status codes are accessible by suffixing the attribute name with _n, where n is the n-th ordered request 1-based. So if the template has four requests and we are currently at number 3:

• status_code: will refer to the response code of request number 3
• status_code_1 and status_code_2 will refer to the response codes of the sequential responses number one and two

For example with status_code_1, status_code_3, andbody_2:

    matchers:
      - type: dsl
        dsl:
          - "status_code_1 == 404 && status_code_2 == 200 && contains((body_2), 'secret_string')"

Request conditions might require more memory as all attributes of previous responses are kept in memory

Example HTTP Template

The final template file for the .git/config file mentioned above is as follows:

id: git-config

info:
  name: Git Config File
  author: Ice3man
  severity: medium
  description: Searches for the pattern /.git/config on passed URLs.

http:
  - method: GET
    path:
      - "{{BaseURL}}/.git/config"
    matchers:
      - type: word
        words:
          - "[core]"

More complete examples are provided here