GoSSTI

GoSSTI is a SSTI scanner for web application. Developed in Go.

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GoSSTI is a SSTI scanner for web application. Developed in Go. GoSSTI allow you to detect template engine of language running behind an existing application.

USAGE: gossti detect -u <URL>

Actually, gossti doesn't provide dynamic parameters analysis. You have to replace the variables with the string "SSTI" as value.

OPTIONS:

-h, --help help for detect command -u, --url string The target IP or domain to scan -C, --cookies strings Cookies to use (e.g. -C 'cookie1=value1; cookie2=value2') -X, --method string The HTTP method to use (default "GET") --user-agent string Custom user-agent to use (default "gossti 1.0.0") --timeout duration Timeout for HTTP requests (e.g. 10s)

NOTE: For the first usage, you need to download the gossti database with the following command:

gossti plugins update

Advanced Usage with forms

USAGE: gossti detect -u <URL> -X POST --form 'field1=value1,field2=value2'

OPTIONS: --form strings Form fields to use (e.g. --form 'field1=value1,field2=value2') --form-item stringToString Form field to use (e.g. --form 'field1=value1' --form 'field2=value2') --form-type string Form type to use (e.g. urlencoded, multipart) (default "urlencoded")

Some examples

Using GET method:

gossti -u http://example.com/something?name=SSTI

Using POST method and multipart form:

gossti -u http://example.com/something -X POST --form 'field1=SSTI,field2=value2' --form-type multipart

Using PUT method and custom user-agent:

gossti -u http://example.com/something?name=SSTI -X PUT --user-agent "custom-agent 1.0"

Using custom payloads

Document format

Each plugins concern a single language, all plugins can be found in the plugins folder named like this: <language>.yml.

The document format is the following:

version: 1.0.0
name: Python
engines:
  - name: Mako
    payloads:
      - id: python_mako_ecA9Ba9885
        payload: ${21389+219839}
        response:
          expected: 241228
          invalidate: ${241228}
          error: false

• version: The version of the plugin
• name: The name of the language
• engines: The template engines of the language
  • name: The name of the template engine
  • payloads: The payloads to use
    • id: The ID of the payload
    • payload: The payload to use
    • response: The response to expect
      • expected: The expected response
      • invalidate: The payload to use to invalidate the cache
      • error: If the response is an error

To add a new payload, you can add a new payload in the payloads section of the plugin.

Define the payload ID like this: <language>_<template_engine>_<random_string>

You can generate a random string with the following command:

python3 -c "import random; import string; print(''.join(random.choice(string.hexdigits) for i in range(10)))"

Installation

Binary Releases

We are now shipping binaries for each of the releases so that you don't even have to build them yourself! How wonderful is that!

If you're stupid enough to trust binaries that I've put together, you can download them from the releases page.

Using go install

If you have a Go environment ready to go (at least go 1.19), it's as easy as:

go install github.com/LeoFVO/gossti@latest

PS: You need at least go 1.19 to compile gossti.

Using Docker

docker pull ghcr.io/leofvo/gossti:latest
docker run gossti:latest

Building From Source

Prerequisites

Since this tool is written in Go you need to install the Go language/compiler/etc. Full details of installation and set up can be found on the Go language website. Once installed you have two options. You need at least go 1.19 to compile gossti.

Clone the repository

git clone git@github.com:LeoFVO/gossti.git

Compiling

gossti has external dependencies, and so they need to be pulled in first:

go get && go build

This will create a gossti binary for you. If you want to install it in the $GOPATH/bin folder you can run:

go install

Setup

Documentation

The documentation is available at https://leofvo.github.io/gossti/.

In order to deploy documentation for your project, you need to allow github actions to deploy github pages. To do so, go to your repository settings > Pages, and in the Build and deployment section, select Github Actions as the source.

License

See the LICENSE file.