[Webhacking.kr] 6번

2017. 9. 3. 23:41

   HINT : base64  

index.phps

ID : guest
PW : 123qwe


index.phps의 내용을 보자


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<?php 
if(!$_COOKIE[user]) 
{ 
    $val_id="guest"; 
    $val_pw="123qwe"; 
 
    for($i=0;$i<20;$i++) 
    { 
        $val_id=base64_encode($val_id); 
        $val_pw=base64_encode($val_pw); 
 
    } 
 
    $val_id=str_replace("1","!",$val_id); 
    $val_id=str_replace("2","@",$val_id); 
    $val_id=str_replace("3","$",$val_id); 
    $val_id=str_replace("4","^",$val_id); 
    $val_id=str_replace("5","&",$val_id); 
    $val_id=str_replace("6","*",$val_id); 
    $val_id=str_replace("7","(",$val_id); 
    $val_id=str_replace("8",")",$val_id); 
 
    $val_pw=str_replace("1","!",$val_pw); 
    $val_pw=str_replace("2","@",$val_pw); 
    $val_pw=str_replace("3","$",$val_pw); 
    $val_pw=str_replace("4","^",$val_pw); 
    $val_pw=str_replace("5","&",$val_pw); 
    $val_pw=str_replace("6","*",$val_pw); 
    $val_pw=str_replace("7","(",$val_pw); 
    $val_pw=str_replace("8",")",$val_pw); 
 
    Setcookie("user",$val_id); 
    Setcookie("password",$val_pw); 
 
    echo("<meta http-equiv=refresh content=0>"); 
} 
?> 
 
<html> 
<head> 
<title>Challenge 6</title> 
<style type="text/css"> 
body { background:black; color:white; font-size:10pt; } 
</style> 
</head> 
<body> 
 
<? 
 
$decode_id=$_COOKIE[user]; 
$decode_pw=$_COOKIE[password]; 
 
$decode_id=str_replace("!","1",$decode_id); 
$decode_id=str_replace("@","2",$decode_id); 
$decode_id=str_replace("$","3",$decode_id); 
$decode_id=str_replace("^","4",$decode_id); 
$decode_id=str_replace("&","5",$decode_id); 
$decode_id=str_replace("*","6",$decode_id); 
$decode_id=str_replace("(","7",$decode_id); 
$decode_id=str_replace(")","8",$decode_id); 
 
$decode_pw=str_replace("!","1",$decode_pw); 
$decode_pw=str_replace("@","2",$decode_pw); 
$decode_pw=str_replace("$","3",$decode_pw); 
$decode_pw=str_replace("^","4",$decode_pw); 
$decode_pw=str_replace("&","5",$decode_pw); 
$decode_pw=str_replace("*","6",$decode_pw); 
$decode_pw=str_replace("(","7",$decode_pw); 
$decode_pw=str_replace(")","8",$decode_pw); 
 
 
for($i=0;$i<20;$i++) 
{ 
    $decode_id=base64_decode($decode_id); 
    $decode_pw=base64_decode($decode_pw); 
} 
 
echo("<font style=background:silver;color:black>&nbsp;&nbsp;HINT : base64&nbsp;&nbsp;</font><hr><a href=index.phps style=color:yellow;>index.phps</a><br><br>"); 
echo("ID : $decode_id<br>PW : $decode_pw<hr>"); 
 
if($decode_id=="admin" && $decode_pw=="admin") 
{ 
    @solve(6,100); 
} 
 
 
?> 
 
</body> 
</html> 
cs


오... ㅂㄷㅂㄷ

근데 뭐... 의외로 간단하네

    $val_id="guest"; 
    $val_pw="123qwe";

여기서 저 두개가 인코딩되서 나중에 디코드되서 적히는 거니까 

쿠키값 변조를 하면 되는구만~ ㅇㅋ


코드를 똑같이 배껴서 위 $val_id와 $val_pw를 admin으로 바꿔서 나온값을 쿠키변조시켜서 다시 보내면된다.

간단하군


admin을 넣은 결과 :

Vm0wd@QyUXlVWGxWV0d^V!YwZDRWMVl$WkRSV0!WbDNXa!JTVjAxV@JETlhhMUpUVmpBeFYySkVUbGhoTVVwVVZtcEJlRll&U@tWVWJHaG9UVlZ$VlZadGNFSmxSbGw!VTJ0V!ZXSkhhRzlVVmxaM!ZsWmFjVkZ0UmxSTmJFcEpWbTEwYTFkSFNrZGpSVGxhVmpOU!IxcFZXbUZrUjA!R!UyMTRVMkpIZHpGV!ZFb$dWakZhV0ZOcmFHaFNlbXhXVm!wT!QwMHhjRlpYYlVaclVqQTFSMWRyV@&kV0!ERkZVbFJHVjFaRmIzZFdha!poVjBaT@NtRkhhRk&sYlhoWFZtMXdUMVF$TUhoalJscFlZbGhTV0ZSV@FFTlNiRnBZWlVaT!ZXSlZXVEpWYkZKRFZqQXhkVlZ!V@xaaGExcFlXa!ZhVDJOc@NFZGhSMnhUVFcxb@IxWXhaREJaVmxsM!RVaG9hbEpzY0ZsWmJGWmhZMnhXY!ZGVVJsTk&WMUo!VmpKNFQxWlhTbFpYVkVwV!lrWktTRlpxUm!GU@JVbDZXa!prYUdFeGNHOVdha0poVkRKT@RGSnJhR@hTYXpWeldXeG9iMWRHV@&STldHUlZUVlpHTTFSVmFHOWhiRXB*WTBac!dtSkdXbWhaTVZwaFpFZFNTRkpyTlZOaVJtOTNWMnhXWVZReFdsaFRiRnBZVmtWd!YxbHJXa$RUUmxweFVtMUdVMkpWYkRaWGExcHJZVWRGZUdOSE9WZGhhMHBvVmtSS!QyUkdTbkpoUjJoVFlYcFdlbGRYZUc&aU!XUkhWMjVTVGxOSGFGQlZiVEUwVmpGU!ZtRkhPVmhTTUhCNVZHeGFjMWR0U@tkWGJXaGFUVzVvV0ZreFdrZFdWa$B*VkdzMVYySkdhM@hXYTFwaFZURlZlRmR!U@s!WFJYQnhWVzB^YjFZeFVsaE9WazVPVFZad@VGVXlkREJXTVZweVkwWndXR0V^Y0ROV@FrWkxWakpPU!dKR!pGZFNWWEJ@Vm!0U!MxUXlUWGxVYTFwb!VqTkNWRmxZY0ZkWFZscFlZMFU!YVUxcmJEUldNalZUVkd^a!NGVnNXbFZXYkhCWVZHdGFWbVZIUmtoUFYyaHBVbGhDTmxkVVFtRmpNV!IwVTJ0a!dHSlhhR0ZVVnpWdlYwWnJlRmRyWkZkV@EzQjZWa@R*TVZZd0!WWmlla!pYWWxoQ!RGUnJXbEpsUm!SellVWlNhVkp!UW&oV!YzaHJWVEZzVjFWc!dsaGlWVnBQVkZaYWQyVkdWWGxrUkVKWFRWWndlVmt$V@&kWFIwVjRZMFJPV@!FeVVrZGFWM@hIWTIxS!IxcEhiRmhTVlhCS!ZtMTBVMU!^VlhoWFdHaFlZbXhhVjFsc!pHOVdSbXhaWTBaa@JHSkhVbGxhVldNMVlWVXhXRlZyYUZkTmFsWlVWa@Q0YTFOR!ZuTlhiRlpYWWtoQ!NWWkdVa@RWTVZwMFVtdG9VRll&YUhCVmJHaERUbXhrVlZGdFJtcE&WMUl$VlRKMGExZEhTbGhoUjBaVlZucFdkbFl$V@&OT@JFcHpXa@R$YVZORlNrbFdNblJyWXpGVmVWTnVTbFJpVlZwWVZGYzFiMWRHWkZkWGJFcHNVbTFTZWxsVldsTmhWa$AxVVd^d!YySllVbGhhUkVaYVpVZEtTVk&zYUdoTk!VcFZWbGN^TkdReVZrZFdiR!JvVW&wc@IxUldXbmRsYkZsNVkwVmtWMDFFUmpGWlZXaExWMnhhV0ZWclpHRldNMmhJV!RJeFMxSXhjRWhpUm!oVFZsaENTMVp0TVRCVk!VMTRWbGhvV0ZkSGFGbFpiWGhoVm!^c@NscEhPV$BTYkhCNFZrY$dOVll^V@&OalJXaFlWa!UxZGxsV!ZYaFhSbFp&WVVaa!RtRnNXbFZXYTJRMFdWWktjMVJ!VG!oU@JGcFlXV$hhUm!ReFduRlJiVVphVm0xU!NWWlhkRzloTVVwMFlVWlNWVlpXY0dGVVZscGhZekZ$UlZWdGNFNVdNVWwzVmxSS0!HRXhaRWhUYkdob!VqQmFWbFp0ZUhkTk!WcHlWMjFHYWxacmNEQmFSV!F$VmpKS@NsTnJhRmRTTTJob!ZrUktSMVl^VG&WVmJFSlhVbFJXV!ZaR!l*RmlNV!JIWWtaV!VsZEhhRlJVVm!SVFpXeHNWbGRzVG!oU!ZFWjZWVEkxYjFZeFdYcFZiR@hZVm!^d!lWcFZXbXRrVmtwelZtMXNWMUl*YURWV0!XUXdXVmRSZVZaclpGZGliRXB&Vld0V!MySXhiRmxqUldSc!ZteEtlbFp0TURWWFIwcEhZMFpvV@sxSGFFeFdNbmhoVjBaV@NscEhSbGROTW!oSlYxUkplRk!^U!hoalJXUmhVbXMxV0ZZd!ZrdE&iRnAwWTBWa!dsWXdWalJXYkdodlYwWmtTR0ZHV@xwaVdHaG9WbTE0YzJOc!pISmtSM0JUWWtad0&GWlhNVEJOUmxsNFYyNU9hbEpYYUZoV@FrNVRWRVpzVlZGWWFGTldhM0I@VmtkNFlWVXlTa!pYV0hCWFZsWndSMVF^V@tOVmJFSlZUVVF$UFE9PQ==


이제 이 값을 이용해서 쿠키값을 변조하면 된다.



You have cleared the 6 problems.

Score + 100


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