Greatest Common Divisor

def gcd(m, n):
    if m < n:
        m,n = n, m
    if n == 0:
        return m
    if m % n == 0:
        return n
    else:
        return gcd(n, m%n)

def main():
    print(gcd(66528, 52920))   
    
if __name__ == "__main__":
	main()
def gcd(m,n):
    while n != 0:
       r = m%n
       (m,n) = (n,r)
    return abs(m)

def main():
    print(gcd(66528, 52920))   
    
if __name__ == "__main__":
	main()
더보기

1512

 

 

MODULAR ARITHMETIC

def extended_gcd(a, b):
    if b > a:
        a, b = b, a
    if b == 0:
        return 0, 1  
    r = a % b
    print("a:{}, b:{}, r:{}".format(a, b, r))      
    v, u = extended_gcd(r, b)
    print("exit - a:{}, b:{}, v:{}, u:{}, r:{}".format(a, b, v, u, r))  
    return u - (a//b) * v, v


def main():  
    u, v = extended_gcd(26513, 32321)
    print("{}, {}".format(u, v))
    
if __name__ == "__main__":
	main()
더보기

-8404

 

'Challenge > CRYPTOHACK' 카테고리의 다른 글

[CRYPTOHACK] INTRODUCTION TO CRYPTOHACK  (0) 2022.03.31

Finding Flags

더보기

crypto{y0ur_f1rst_fl4g}

 

 

Great Snakes

#!/usr/bin/env python3

import sys
# import this

if sys.version_info.major == 2:
    print("You are running Python 2, which is no longer supported. Please update to Python 3.")

ords = [81, 64, 75, 66, 70, 93, 73, 72, 1, 92, 109, 2, 84, 109, 66, 75, 70, 90, 2, 92, 79]

print("Here is your flag:")
print("".join(chr(o ^ 0x32) for o in ords))
더보기

crypto{z3n_0f_pyth0n}

 

 

ASCII

a = [99, 114, 121, 112, 116, 111, 123, 65, 83, 67, 73, 73, 95, 112, 114, 49, 110, 116, 52, 98, 108, 51, 125]
result = ''
for i in range(0, len(a)):
    result += chr(a[i])    
print(result)​
더보기
crypto{ASCII_pr1nt4bl3}

 

Hex

a ='63727970746f7b596f755f77696c6c5f62655f776f726b696e675f776974685f6865785f737472696e67735f615f6c6f747d'
a = bytes.fromhex(a)
print(a)​
더보기

crypto{You_will_be_working_with_hex_strings_a_lot}

 

 

Base64

import base64

a = '72bca9b68fc16ac7beeb8f849dca1d8a783e8acf9679bf9269f7bf'
a = base64.b64encode(bytes.fromhex(a))
print(a)
더보기

crypto/Base+64+Encoding+is+Web+Safe

 

 

Bytes and Big Integers

from Crypto.Util.number import *

a = 11515195063862318899931685488813747395775516287289682636499965282714637259206269
a = long_to_bytes(a)
print(a)
더보기

crypto{3nc0d1n6_4ll_7h3_w4y_d0wn}

 

 

XOR Starter

a = "label"
result = ''

for c in a:
    result += chr(ord(c) ^ 13)

print(result)
더보기

cypto{aloha}

 

 

XOR Properties

from Crypto.Util.number import *
import binascii

k1 = "a6c8b6733c9b22de7bc0253266a3867df55acde8635e19c73313"
k2_k1 = "37dcb292030faa90d07eec17e3b1c6d8daf94c35d4c9191a5e1e"
k2_k3 = "c1545756687e7573db23aa1c3452a098b71a7fbf0fddddde5fc1"
flag_k1_k3_k2 = "04ee9855208a2cd59091d04767ae47963170d1660df7f56f5faf"

result = long_to_bytes(bytes_to_long(binascii.unhexlify(flag_k1_k3_k2)) ^ bytes_to_long(binascii.unhexlify(k1)) ^ bytes_to_long(binascii.unhexlify(k2_k3)))

print(result)
더보기

crypto{x0r_i5_ass0c1at1v3}

 

 

Favourite byte

import binascii

a = '73626960647f6b206821204f21254f7d694f7624662065622127234f726927756d'
result=''

a = binascii.unhexlify(a)
for c in a:
    result += chr(c^(a[0]^ord('c')))
    
print(result)
더보기

crypto{0x10_15_my_f4v0ur173_by7e}

 

 

You either know, XOR you don't

import binascii
from Crypto.Util.strxor import *
a = '0e0b213f26041e480b26217f27342e175d0e070a3c5b103e2526217f27342e175d0e077e263451150104'
key=''
result =''
# key 획득 및 유추
a = binascii.unhexlify(a)
key = strxor((a[:7]), b'crypto{')

# xor 연산
key = list('myXORkey')
for i in range(len(a)):
    result += chr(a[i] ^ ord(key[i%8]))

print(result)
더보기

crypto{1f_y0u_Kn0w_En0uGH_y0u_Kn0w_1t_4ll}

 

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[CRYPTOHACK] MODULAR ARITHMETIC  (0) 2022.03.31

[Enkryptteed]

Enkryptteed

゚ω゚ノ= /`m´)ノ ~┻━┻   //*´∇`*/ ['_']; o=(゚ー゚)  =_=3; c=(゚Θ゚) =(゚ー゚)-(゚ー゚); (゚Д゚) =(゚Θ゚)= (o^_^o)/ (o^_^o);(゚Д゚)={゚Θ゚: '_' ,゚ω゚ノ : ((゚ω゚ノ==3) +'_') [゚Θ゚] ,゚ー゚ノ :(゚ω゚ノ+ '_')[o^_^o -(゚Θ゚)] ,゚Д゚ノ:((゚ー゚==3) +'_')[゚ー゚] }; (゚Д゚) [゚Θ゚] =((゚ω゚ノ==3) +'_') [c^_^o];(゚Д゚) ['c'] = ((゚Д゚)+'_') [ (゚ー゚)+(゚ー゚)-(゚Θ゚) ];(゚Д゚) ['o'] = ((゚Д゚)+'_') [゚Θ゚];(゚o゚)=(゚Д゚) ['c']+(゚Д゚) ['o']+(゚ω゚ノ +'_')[゚Θ゚]+ ((゚ω゚ノ==3) +'_') [゚ー゚] + ((゚Д゚) +'_') [(゚ー゚)+(゚ー゚)]+ ((゚ー゚==3) +'_') [゚Θ゚]+((゚ー゚==3) +'_') [(゚ー゚) - (゚Θ゚)]+(゚Д゚) ['c']+((゚Д゚)+'_') [(゚ー゚)+(゚ー゚)]+ (゚Д゚) ['o']+((゚ー゚==3) +'_') [゚Θ゚];(゚Д゚) ['_'] =(o^_^o) [゚o゚] [゚o゚];(゚ε゚)=((゚ー゚==3) +'_') [゚Θ゚]+ (゚Д゚) .゚Д゚ノ+((゚Д゚)+'_') [(゚ー゚) + (゚ー゚)]+((゚ー゚==3) +'_') [o^_^o -゚Θ゚]+((゚ー゚==3) +'_') [゚Θ゚]+ (゚ω゚ノ +'_') [゚Θ゚]; (゚ー゚)+=(゚Θ゚); (゚Д゚)[゚ε゚]='\\'; (゚Д゚).゚Θ゚ノ=(゚Д゚+ ゚ー゚)[o^_^o -(゚Θ゚)];(o゚ー゚o)=(゚ω゚ノ +'_')[c^_^o];(゚Д゚) [゚o゚]='\"';(゚Д゚) ['_'] ( (゚Д゚) ['_'] (゚ε゚+(゚Д゚)[゚o゚]+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (o^_^o)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚Θ゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚Θ゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (o^_^o))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚Θ゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ ((o^_^o) - 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(゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (c^_^o)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (c^_^o)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (c^_^o)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+((o^_^o) +(o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚ー゚)+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (o^_^o)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) - (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (o^_^o))+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚o゚]) (゚Θ゚)) ('_');

웹페이지에 접속해서 소스를 보았더니 위와같은 코드가 나왔습니다.

이를 전용 converter를 사용해서 변환하였습니다.

 

<!DOCTYPE html>
<html>
    <head>
        <title>What ??</title>
    </head>
    <body>
        <style>
            body {background-color: lightyellow;}
        </style>
        <script>

var enco='';
var enco2=126;
var enco3=33;
var link=document.URL.substr(document.URL.indexOf('/'));
for(i=1;i<122;i++){
  enco=enco+String.fromCharCode(i,0);
}
function enco(x){
  return enco.charCodeAt(x);
}
if(link=="/"+String.fromCharCode(enco(236))+
String.fromCharCode(enco(206))+
String.fromCharCode(enco(192))+
String.fromCharCode(enco(230))+
String.fromCharCode(enco(202))+
String.fromCharCode(enco(214))+
String.fromCharCode(enco(192))+
String.fromCharCode(enco_(204))+
"!!"+String.fromCharCode(enco2)+
String.fromCharCode(enco3))
{
  location.href="./"+link+".html";
}
</script>
    <h1>Click Link</h1>

    <font size="5em">
    <a href="https://www.youtube.com/watch?v=kJQP7kiw5Fk%22%3EWhat is it??</a>
</font>
    </body>
</html>

해당 코드의 조건에 부합하게 코드를 작성하였습니다.

 

let enco=''
for(i=1;i<122;i++){
  enco=enco+String.fromCharCode(i,0);
}
enco= enco.charCodeAt(204);
enco = String.fromCharCode(33)
document.getElementById("demo").innerHTML = enco;

flag directory를 획득할 수 있었습니다.

 

더보기

BCTF{I_HAte_obfuscation!!}

 

[sns]

sns

sns에는 여러 종류가 있습니다 Format에 맞는 주소를 찾으세요

 

여러 sns를 뒤지던중 discord infomation -> github로 들어가 url을 확인하였습니다.

 

 

[BabyEquation]

BabyEquation

ida로 확인하였습니다.

 

code

위와 같은 코드를 확인하였고 이를 풀기 위해 코드를 작성하였습니다.

from z3 import *

a1 = [BitVec('a%i'%i, 8) for i in range(0, 44)]

s = Solver()


s.add ( ((a1[0] + a1[22] - a1[5]) ^ (a1[36] - a1[11]) ^ (a1[34] - a1[37] - a1[25])) ==-189 )
s.add ( (a1[39] ^ (a1[40] + a1[42] - a1[21] - a1[15] - a1[38]) ^ (a1[18] + a1[15] + a1[12] + a1[39] - a1[7])) ==-337 )
s.add ( ((a1[17] - a1[34] - a1[28] - a1[42] - a1[32] - a1[30]) ^ a1[19] ^ (a1[9] + a1[20] + a1[27] + a1[21])) ==-17 )
s.add ( a1[7] + a1[19] + a1[8] - a1[7] - a1[31] - a1[41] ==-22 )
s.add ( ((a1[18] + a1[32] + a1[16] - a1[31]) ^ a1[16] ^ (a1[37] + a1[38] + a1[22])) ==108 )
s.add ( ((a1[31] - a1[24]) ^ (a1[0] + a1[27] + a1[26] - a1[8]) ^ a1[43]) ==-165 )
s.add ( a1[36] + a1[16] + a1[13] + a1[22] + a1[24] + a1[19] + a1[43] - a1[3] - a1[31] - a1[39] - a1[37] ==186 )
s.add ( ((a1[22] + a1[42]) ^ (a1[28] + a1[7] + a1[12] - a1[13] - a1[36]) ^ (a1[5] - a1[15])) ==60 )
s.add ( (a1[2] ^ (a1[0] + a1[32] + a1[13] - a1[35] - a1[17])) ==23 )
s.add ( a1[16] + a1[38] - a1[3] - a1[37] - a1[37] - a1[1] == -186 )
s.add( ((a1[32] + a1[42] + a1[37] - a1[9]) ^ (a1[27] - a1[0] - a1[38]) ^ (a1[27] + a1[16])) == -165 )
s.add( ((a1[8] + a1[29] - a1[38]) ^ a1[1] ^ a1[7] ^ (a1[30] + a1[33] + a1[22])) == 345 )
s.add( a1[39] + a1[9] + a1[36] + a1[9] + a1[13] - a1[32] == 319 )
s.add( a1[41] + a1[34] - a1[15] - a1[18] - a1[18] - a1[2] == -120 )
s.add( a1[23] + a1[43] + -a1[12] - a1[2] - a1[10] - a1[5] - a1[6] == -456 )
s.add( ((a1[25] - a1[15]) ^ (a1[34] + a1[23] - a1[22] - a1[32])) == 5 )
s.add( ((a1[0] + a1[33]) ^ (a1[17] + a1[17] + a1[40] + a1[36] + a1[42]) ^ (a1[39] - a1[13])) == -364 )
s.add( ((a1[25] + a1[29]) ^ (a1[9] + a1[2] - a1[28])) == 215 )
s.add( ((a1[32] + a1[14] + a1[4] - a1[15] - a1[16] - a1[28]) ^ a1[36]) == -23 )
s.add( ((a1[0] + a1[27] + a1[22] - a1[12] - a1[15]) ^ a1[25]) == -75 )
s.add( a1[13] + a1[39] + a1[8] + a1[15] + a1[42] - a1[27] - a1[4] - a1[27] == 221)
s.add( a1[20] + a1[9] + a1[2] + a1[8] - a1[0] - a1[17] - a1[32] == 85)
s.add( ((a1[19] + a1[42] - a1[28]) ^ (a1[14] + a1[5] + a1[10] + a1[43] + a1[31] + a1[5] - a1[11])) == 320)
s.add( ((a1[3] + a1[8] + a1[40] + a1[8] - a1[34]) ^ a1[21] ^ (a1[34] - a1[26])) == -355)
s.add( a1[13] + a1[20] + a1[10] + a1[10] + a1[3] + a1[20] - a1[2] == 498)
s.add( ((a1[0] + a1[24] - a1[42] - a1[42] - a1[33]) ^ a1[2] ^ (a1[7] + a1[5] + a1[20] + a1[13] - a1[10])) == -331)
s.add( ((a1[8] + a1[32] + a1[29] + a1[7] + a1[15]) ^ (a1[37] + a1[18] + a1[37] + a1[5] - a1[28] - a1[32])) == 279)
s.add( a1[42] + a1[7] + a1[14] + a1[17] + a1[43] + a1[26] + a1[38] - a1[5] - a1[40] - a1[2] == 105)
s.add( ((a1[41] + a1[30] - a1[13]) ^ (a1[4] + a1[39] + a1[38] - a1[11])) == 240)
s.add( a1[34] + a1[5] + a1[26] + a1[8] + a1[42] + a1[1] - a1[36] - a1[22] == 316 )
s.add( (a1[28] ^ (a1[33] + a1[35] + a1[41] + a1[38] - a1[31] - a1[23]) ^ a1[2]) == 260)
s.add( ((a1[0] + 2 * a1[13] - a1[7] - a1[1]) ^ (a1[36] - a1[33])) == -183)
s.add( ((a1[20] + a1[8] + a1[39] + a1[4] - a1[5] - a1[13] - a1[15]) ^ a1[1]) == -37)
s.add( ((a1[29] + a1[10] + a1[11] - a1[25] - a1[33] - a1[41] - a1[0] - a1[42]) ^ a1[21]) == -129)
s.add( a1[29] + a1[2] + a1[20] + a1[23] - a1[8] - a1[13] - a1[36] == 148)
s.add( ((a1[8] - a1[10] - a1[39]) ^ (a1[34] + a1[9] + a1[2] + a1[30] + a1[35] + a1[27] - a1[38])) == -410)
s.add( ((a1[8] + a1[16] - a1[23] - a1[1] - a1[31]) ^ (a1[9] - a1[38])) == -28)
s.add( a1[30] + a1[13] + a1[40] + a1[32] + a1[43] + a1[3] + a1[25] - a1[43] - a1[18] == 561)
s.add( (a1[10] ^ (a1[27] + a1[10] + a1[17] - a1[4] - a1[13] - a1[8] - a1[31] - a1[8] - a1[5]) ^ a1[1]) == -171)
s.add( a1[4] + a1[42] + a1[26] - a1[19] - a1[27] - a1[21] - a1[43] == 34)
s.add( a1[20] + a1[37] - a1[18] - a1[36] - a1[20] - a1[41] - a1[11] == -232 )
s.add ( (a1[15] ^ a1[33] ^ (a1[27] - a1[23]) ^ (a1[40] + a1[6] + a1[42] - a1[31])) == -218 )
s.add ( ((a1[34] - a1[20]) ^ (a1[21] + a1[43] + a1[29] + a1[32] - a1[42] - a1[7] - a1[11])) == -128 )
s.add ( ((a1[42] - a1[40] - a1[6]) ^ (a1[24] + a1[41] - a1[12] - a1[2] - a1[39]) ^ (a1[21] + a1[20]) ^ a1[13]) == 49 )
s.add ( a1[34] + a1[18] + a1[30] + a1[2] + a1[7] + a1[22] + a1[15] + a1[40] - a1[11] - a1[14] - a1[41] == 388 )
s.add ( a1[28] + a1[4] + a1[28] + a1[37] + a1[38] + a1[41] - a1[39] - a1[22] == 488 )
s.add ( a1[32] + a1[38] + a1[43] + a1[30] + a1[11] + a1[21] - a1[17] - a1[1] == 327 )
s.add ( a1[11] + a1[0] + a1[7] + a1[38] - a1[17] - a1[4] - a1[12] == 57 )
s.add ( a1[31] + a1[24] + a1[16] + a1[18] + a1[21] - a1[7] - a1[34] - a1[10] == 120 )
s.add ( (a1[40] ^ (a1[7] + a1[29] + a1[0] + a1[10] + a1[16] + a1[31] - a1[12] - a1[19] - a1[18] - a1[24])) == 149 )

#for i in range(0, len(a1)):
#    s.add(a1[i] >= 33)
#    s.add(a1[i] <= 126)





#s.add(a1[42] == ord("!"))


while s.check() == sat:
    m = s.model()
    x = [0] * len(a1)
    for key in m:
        idx = int(str(key)[1:])
        x[idx] = chr(m[key].as_long())
    print("".join(x))

 

더보기

BCTF{c4n_Bru7E_fOrc3_pO5SiB1e?_i'd_r4thEr_uS3_z3}

 

[an old book]

an old book

제공된 파일을 다운받아 hxd에 넣어 string 형태로 flag가 존재하는지 확인하였다.

 

더보기

BCTF{th1S_prO9ram_cAN_B_ruN_IN_DOSmOdE}

 

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ICMP

ICMP 패킷을 다루는 문제입니다.

 

ICMP 패킷을 던져주고 분석하라는 문제로 보입니다.

 

 

문제 분석

icmp.pcap

와이어 샤크를 이용하여 패킷을 확인하였습니다.

기존의 많은 문제들이 그러했듯 데이터 영역에 암호화된 문자열이 들어있을 것으로 생각되어 데이터들을 모두 뽑아 보았습니다만 맨 마지막 줄에 '사실 여기에는 플래그가 없어'라는 문장을 확인할 수 있었습니다.

때문에 다른곳을 뒤지던중 id=0x005a 라고 적힌 문자열을 발견했습니다.

 

icmp.pcap id

source를 오름차순으로 나열하여 id를 확인하였습니다.

 

 

문제 풀이

id의 16진수 값을 ascii로 치환 한후 여러 복호화 툴을 사용하여 확인한 결과 base64로 디코딩된 것을 확인하였습니다.

 

base64 decoding

flag를 획득할수 있었습니다.​

더보기

dvCTF{h1dden_1n_the_1d}

 

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Websockets?

UTCTF Web 문제입니다.

 

Description :

Can you hack my website?

 

본인의 웹사이트를 해킹해 달라는 문제입니다.

 

문제 분석

웹 사이트를 해킹하는 문제인데 제목이 Webscokets 이여서 이 둘의 연관성을 생각하며 진행하겠습니다.

 

index page

최하단에 Employee login 기능을 제외하면 특별한 기능이 없는 page입니다.

해당 페이지의 코드부터 확인하였습니다.

 

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		
		<link rel="stylesheet" href="/static/style.css">
		<title>Fake Corp</title>
		
	</head>
	<body>
		
<div class="content backdrop">

			
<center>
	<h1 class=fancy>Fake Company</h1>
	<span class=fancy>We are dedicated to empowering our customers to 10x their development lifecycle synergies.</span>
	<span class=fancy>Want to learn about our solutions?</span>
	<!-- TODO: this button is set to the wrong URL and for some reason only the 'admin' account can change it. Tom is the only one who knows the passcode and he's out until Wednesday. I'm not paid enough to deal with this so it's just going to be broken for now. It's not like we get traffic anyway 😠 -->
	<a class="fancy button" href="/contact-us">Contact Us</a>
</center>

		</div>
		<div id="footer">
			
			<a href="/internal/login">Employee login</a>
			
		</div>
	</body>
</html>

주석으로 처리된 부분에 'admin' 계정 만이 해당 버튼을 활성화 할수 있습니다라며 admin 계정의 존재 여부에 대해 알려주고 있습니다.

 

employee login

직원 로그인 페이지입니다.

 

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		
		<link rel="stylesheet" href="/static/style.css">
		<title>Fake Corp</title>
		
	</head>
	<body>
		
		<div class="content">
		
			
<div class="topbox">
	<h1>Login</h1>
	<span class="error"></span>
	<form method="post">
		<input name="username" type="text" placeholder="Username" required> 
		<!-- what is this garbage, you ask? Well, most of our pins are now 16 digits, but we still have some old 3-digit pins left because tom is a moron and can't remember jack -->
		<input name="password" type="password" placeholder="PIN" required pattern="(\d{3}|\d{16})">
		<input type="submit">
	</form>
	<script src="/static/login.js"></script>
</div>

		</div>
		<div id="footer">
			
			<a href="/internal/login">Employee login</a>
			
		</div>
	</body>
</html>

employee login 페이지로 넘어와서 코드를 확인해 보았습니다.

Tom이 멍청해서 아직도 3자리 pin 코드를 사용한다고 알려줍니다.

 

이를 통해 브루트 포스 공격을 이용하여야 된다고 생각하였습니다.

※ 추후 문제를 풀다 알게되었는데 이때 주의할 점은 Username값과 Pin 값이 Webscokets을 통해 통신이 이루어진다는 점이었습니다.

 

 

문제 풀이

employee login

id는 admin으로 설정하고 bruteforce를 진행합니다.

 

from websocket import create_connection

for i in range(900, 1000):
	ws = create_connection("ws://web1.utctf.live:8651/internal/ws")

	print(ws.recv())
	ws.send("begin")
	ws.send("user admin")
	print(i)
	ws.send("pass "+str(i))
	print(ws.recv())

해당과정은 사전에 burp suite를 사용하여 websocket이 어떤내용을 수신하는지 확인하고 제작하였습니다.

 

 

brute force

curl에서 사용하여 접근하거나 획득한 PIN 907을 사용하여 로그인 하면 flag를 획득할 수 있습니다.

 

더보기

utflag{w3bsock3ts}

 

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CyberStreak v1.0

dvCTF Web 문제입니다.

 

Description :

Thank you for your report !

You can now create your own challenges, delete them, deactivate / activate them.

xXx-michel-xXx

http://challs.dvc.tf:5002

Brute force is strictly forbidden and useless.Hello,

I am a student and I would like to improve my web development skills. To practice, I am creating my first web application. This application is a kind of cybercoach. Example: you want to do sports. A sport goal could be to do 100 push-ups per day for 1 month. The application will allow you to create this "challenge" and each day, you will have to do the number of push-ups you have set and note it in the application. If you don't do the push-ups for 3 days, it's a failure and you lose your streak.

This first version of the application gives you the possibility to create an account and to do the challenge of the example.

Can you test the security of my application ?

xXx-michel-xXx

http://challs.dvc.tf:5001

Brute force is strictly forbidden and useless.

 

푸시업 챌린지가 있습니다. 취약점을 찾아서 신고해주시기 바랍니다.

웹페이지 테스트를 통해 취약점을 찾아내는 문제입니다.

 

 

문제 분석

index page

정보가 없기 때문에 페이지 소스코드,  네트워크 패킷, 쿠키 순으로 살펴보았습니다.

페이지 소스코드는 hidden과 disable 처리된 구문들이 있었지만 문제와는 크게 상관 없었습니다.

네트워크 패킷 또한 눈에 보이는게 없었습니다.

 

cookie

그러던 중 cookie에서 익숙한 형태의 값을 발견하였습니다.

JWT로 추정되며 이를 확인하기 위해 base64로 디코딩 해보았습니다.

 

decoding

JWT인 것이 확실합니다.

 

 

문제 풀이

인코딩하여 제출해보았으나 로그아웃이 이루어질 뿐 flag는 확인할수 없었습니다.

때문에 secret 키가 존재하는지 확인해 보았습니다.

 

username : xXx-michel-xXx
secret : s3cr3t

확인 결과 secret 값이 존재하였으며 username은 해당 서버 소유자인 xXx-michel-xXx로 추정하여 진행하였습니다.

 

encoding

인코딩된 세션값을 획득할 수 있었습니다.

 

flag

해당 값으로 cookie값을 바꿔주게 되면 flag가 나오게 됩니다.

 

더보기

dvCTF{80b8d1A92G6a13a98Dc7b546a7a7Y35}

 

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