Writeup: Redpwn 2019 - Crypt

(Updated: )
writeups
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Information

  • category: web
  • points: 50

Description

Store your most valuable secrets with this new encryption algorithm.

Link: https://web5.2019.redpwn.net/

Writeup

The web page just shows a string:

your safely encrypted flag is vdDby72W15O2qrnJtqep0cSnsd3HqZzbx7io27C7tZi7lanYx6jPyb2nsczHuMec

The index.html file is just some JSFuck code:

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<!doctype html>
your safely encrypted flag is Z3qFdWdAgT1gVGNzYFFTe25RW4dxU0aFcWJShVplX0JlP1OCcVJ5c2dRW3ZxYnFG
<script>
  setInterval(_=>console.clear(), 50)
  setInterval(_=>{debugger}, 50)
  // saving the code here for ultra secure encryption
  self.example_flag = 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]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])('example_flag{xyz}')
</script>

The eval content is just a function that performs a rot and a base64 encodigin on the input.

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f=>btoa(
    [...btoa(f)].map(s=>String.fromCharCode(s.charCodeAt(0)+(location.host.charCodeAt(0)%location.host.charCodeAt(3))))
.join(''))

To reverse the process and get the flag we can use two approach:

  • Bruteforce every char
  • Find the correct rot value and reverse the btoa function

Bruteforce

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var btoa = require('btoa');
challenge = f=>btoa([...btoa(f)].map(s=>String.fromCharCode(s.charCodeAt(0)+99)).join(''))


var encflag = "vdDby72W15O2qrnJtqep0cSnsd3HqZzbx7io27C7tZi7lanYx6jPyb2nsczHuMec";

for (var i=0; i<256; i++) {
    for (var k=0; k<256; k++) {
        flag = challenge("flag{tHe_H1gh3st_quA11ty_antI_d3buG}" + String.fromCharCode(i) + String.fromCharCode(k));
        console.log(flag);
        console.log(i, k);
    }
}

To find the flag we first inserted the string flag{ into the function challenge and then using rg and updating the code we code we got the final flag.

Correct solution

We first solved the location.host.charCodeAt equation so we know that the encoding function just add 99 to the input char. Next step is: split the input string, remove 99 and base64 it. To reuse the same code from the challenge we created the reverse script:

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var atob = require('atob');
d = f=>atob([...atob(f)].map(s=>String.fromCharCode(s.charCodeAt(0)-99)).join(''))

console.log(d("vdDby72W15O2qrnJtqep0cSnsd3HqZzbx7io27C7tZi7lanYx6jPyb2nsczHuMec"));

Alternately Python can be used:

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from base64 import b64decode

e = "vdDby72W15O2qrnJtqep0cSnsd3HqZzbx7io27C7tZi7lanYx6jPyb2nsczHuMec"

flag = "".join([chr(x - 99) for x in b64decode(e)])
print(b64decode(flag).decode())

Flag

flag{tHe_H1gh3st_quA11ty_antI_d3buG}