picoCTF2018 – Web – Client side is still bad

picoCTF2018 – Web – Client side is still bad

Objective:

I forgot my password again, but this time there doesn't seem to be a reset, can you help me? http://2018shell.picoctf.com:8249 (link [1] )

Solution:

Looked at the HTML code and found this interesting bit

function verify() {
	checkpass = document.getElementById("pass").value;
	split = 4;
	if (checkpass.substring(split7, split8) == '}') {
	if (checkpass.substring(split6, split7) == '17e9') {
	if (checkpass.substring(split5, split6) == 'd_91') {
	if (checkpass.substring(split4, split5) == 's_ba') {
	if (checkpass.substring(split3, split4) == 'nt_i') {
	if (checkpass.substring(split2, split3) == 'clie') {
	if (checkpass.substring(split, split*2) == 'CTF{') {
	if (checkpass.substring(0,split) == 'pico') {
	alert("You got the flag!")

It looks like this splits out what you input as the password and compares it against this hard coded password

So I just worked from the bottom up and recreated the flag

picoCTF{client_is_bad_9117e9}

Comments

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