WSA: DOM XSS in AngularJS expression

Challenge
Summary

Challenge

You can check the lab out: here

Having to deal with AngularJS, we know that we should pay special attention to all elements with a ng-sth attribute, since that is linked to Angular.

There is a search functionality, a good starting place, and the text which we supply gets shown in the source code:

Figure 1: Sample Input

Vulnerable part

We can verify that the website uses angular:

NG-app

<body ng-app="" class="ng-scope">

<section class="search">
  <form action="/" method="GET" class="ng-pristine ng-valid">
    <input type="text" placeholder="Search the blog..." name="search">
    <button type="submit" class="button">Search</button>
  </form>
</section>

After playing around, testing {{alert(1)}} and similar naive payloads :P, then checking out the documentation for ways to effectively use {{}} to our advantage, the solution was given by PayloadsAllTheThings.

{{constructor.constructor('alert(1)')()}}

Note on Angular

For more info check out:

Summary

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WSA: DOM XSS in AngularJS expression

Table of Contents

Challenge

Vulnerable part

Solution

Note on Angular

Summary