🍪CookieMonster is a command-line tool and API for decoding and modifying vulnerable session cookies from several different frameworks.

Overview

🍪 CookieMonster

CookieMonster is a command-line tool and API for decoding and modifying vulnerable session cookies from several different frameworks. It is designed to run in automation pipelines which must be able to efficiently process a large amount of these cookies to quickly discover vulnerabilities. Additionally, CookieMonster is extensible and can easily support new cookie formats.

It's worth emphasizing that CookieMonster finds vulnerabilities in users of frameworks, usually not in the frameworks themselves. These users can resolve vulnerabilities found via CookieMonster by configuring the framework to use a strong secret key.

Features

  • Decodes and unsigns session cookies from Laravel, Django, Flask, Rack, and Express, and also handles raw JWTs.
  • Rapidly evaluates cookies; ignores invalid and unsupported cookies, and quickly tests those that it can.
  • Takes full advantage of Go's fast, native implementations for hash functions.
  • Intelligently decodes URL-encoded and Base64-encoded cookies (i.e. the Base64 of a JWT) when the initial decoding fails.
  • Supports many algorithms for HMAC-based decoders, even if the framework typically only uses one.
  • Flexible base64-encoded wordlist format allows any sequence of bytes key to be added as an entry; ships with a reasonable default list.
Framework Supported Notes
JSON Web Tokens HS256, HS384, HS512
Django Common algorithms
Flask Common algorithms
Rack Common algorithms
Express (cookie-signer) Common algorithms
Laravel AES-CBC-128/256 (GCM not yet supported)
Others Not yet!

Getting Started

To install CookieMonster, install Go and then install the CLI:

go install github.com/iangcarroll/cookiemonster/cmd/[email protected]

CookieMonster only needs two essentials: a cookie to try and unsign, and a wordlist to use. If you don't have a wordlist, CookieMonster ships with a default wordlist from the Flask-Unsign project. CookieMonster wordlists are a bit different; each line must be encoded with base64. This is because Python projects are especially liberal with inserting garbage bytes into these keys, and we need to be able to properly handle them.

An example of using the CLI:

% ./cookiemonster -cookie "gAJ9cQFYCgAAAHRlc3Rjb29raWVxAlgGAAAAd29ya2VkcQNzLg:1mgnkC:z5yDxzI06qYVAU3bkLaWYpADT4I"

🍪 CookieMonster 1.0.0
ℹ️ CookieMonster loaded the default wordlist; it has 38921 entries.
✅ Success! I discovered the key for this cookie; it is: changeme

Express support

CookieMonster is capable of supporting cookies signed with cookie-session, which is common with Express. However, it does several strange things that require care in order to use this tool. A common response from a cookie-session application looks like this:

set-cookie: session=eyJhbmltYWxzIjoibGlvbiJ9
set-cookie: session.sig=Vf2INocdJIqKWVfYGhXwPhQZNFI

In order to pass this into CookieMonster, you must include both the cookie name and the signature cookie. In this example, you would call CookieMonster like this: cookiemonster -cookie session=eyJhbmltYWxzIjoibGlvbiJ9^Vf2INocdJIqKWVfYGhXwPhQZNFI (note the delimiting ^ and the prefixed cookie name). The API accepts this same format in monster.NewCookie.

Resigning support

CookieMonster has limited support for resigning a cookie once it has been unsigned, with the -resign flag. This involves modifying the body of the cookie to match your input, and then re-computing the signature with the key we discovered. Currently, you can do this for Django-decoded cookies; ensure you pass the original cookie to -cookie, and pass -resign an unencoded string of text you'd like to be inside the cookie. CookieMonster will correctly encode your input and then resign the cookie.

API usage

CookieMonster exposes pkg/monster, which allows other applications to easily take advantage of it. This is much more performant than booting the CLI if you are testing many cookies. An example usage of it is below.

import (
    "github.com/iangcarroll/cookiemonster/pkg/monster"
)

var (
	//go:embed wordlists/my-wordlist.txt
	monsterWordlist string

	wl = monster.NewWordlist()
)

func init() {
	if err := wl.LoadFromString(monsterWordlist); err != nil {
        panic(err)
    }
}

func MonsterRun(cookie string) (success bool, err error) {
	c := monster.NewCookie(cookie)

	if !c.Decode() {
		return false, errors.New("could not decode")
	}

	if _, success := c.Unsign(wl, 100); !success {
		return false, errors.New("could not unsign")
	}

	return true, nil
}

Credits

CookieMonster is built with inspiration from several sources, and ships with the excellent Flask-Unsign wordlists.

Issues
  • malformed module path

    malformed module path "embed" missing dot in first path element

    When using go install github.com/iangcarroll/cookiemonster/cmd/[email protected]

    we get can't load package: package github.com/iangcarroll/cookiemonster/cmd/[email protected]: can only use [email protected] syntax with 'go get'

    And when using go get github.com/iangcarroll/cookiemonster/cmd/[email protected]

    we get build github.com/iangcarroll/cookiemonster/cmd/cookiemonster: cannot load embed: malformed module path "embed": missing dot in first path element

    • Is this something I'm doing wrong on my end or this has to do with cookiemonster?
    • How can I fix this and start using cookiemonster?
    opened by infosec-us-team 2
  • runtime/internal/sys

    runtime/internal/sys

    go version go1.17.1 linux/amd64

    go install github.com/iangcarroll/cookiemonster/cmd/[email protected]

    runtime/internal/sys

    /usr/local/go/src/runtime/internal/sys/stubs.go:9:7: PtrSize redeclared in this block /usr/local/go/src/runtime/internal/sys/arch.go:24:38: previous declaration /usr/local/go/src/runtime/internal/sys/stubs.go:10:24: undefined: Uintreg /usr/local/go/src/runtime/internal/sys/stubs.go:16:7: StackGuardMultiplier redeclared in this block /usr/local/go/src/runtime/internal/sys/arch.go:27:74: previous declaration

    opened by alfonsocaponi 1
  • DOCSs / Implement URL parsing by cookiemonster itself

    DOCSs / Implement URL parsing by cookiemonster itself

    Hello, iangcarroll, big thanks for your project and contribution!

    As far as i understand now your project requries a specific cookie or url with cookie in it.

    So first of all we need to get http body, parse it, parse cookies and their values and then for each cookie run the cookiemonster.

    You can't just pass URL into cookiemonster to parse all the cookies and try to decode them, right?

    My idea is : For example i've got 500 subdomains from amass then i pass them to httpx to get alive applications with their schemes and then pass those URLs to ffuf, gau and cookiemonster

    As I see now its not possible to make it that way and I need to implement body parsing and pass each cookie I've found from body, right? Because now cookiemonster -url "url" says: Sorry, I did not receive any cookies from that URL.

    Hope to hear your answer soon and thanks for your hard work!

    opened by wellencamass 0
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