攻防世界 flag_in_your_hand

作者：菜鸟追梦旅行 | 2024-04-18 02:38:54

踩

下载附件打开文件中的html文件

无论输入什么都是错误

我们打开网页源代码看看


<html>
	<head>
		<title>Flag in your Hand</title>
		<style type="text/css">
			body {
				padding-left: 30%;
			}
 
			#flag {
				font-family: Garamond, serif;
				font-size: 36px;
			}
 
			#flagtitle {
				font-family: Garamond, serif;
				font-size: 24px;
			}
 
			.rightflag {
				color: green;
			}
 
			.wrongflag {
				color: red;
			}
		</style>
		<script src="script-min.js"></script>
		<script type="text/javascript">
			var ic = false;
			var fg = "";
 
			function getFlag() {
				var token = document.getElementById("secToken").value;
				ic = checkToken(token);
				fg = bm(token);
				showFlag()
			}
 
			function showFlag() {
				var t = document.getElementById("flagTitle");
				var f = document.getElementById("flag");
				t.innerText = !!ic ? "You got the flag below!!" : "Wrong!";
				t.className = !!ic ? "rightflag" : "wrongflag";
				f.innerText = fg;
			}
		</script>
	</head>
	<body>
		<h1>Flag in your Hand</h1>
		<p>Type in some token to get the flag.</p>
		<p>Tips: Flag is in your hand.</p>
		<div>
			<p>
				<span>Token:</span>
				<span><input type="text" id="secToken"/></span>
			</p>
			<p>
				<input type="button" value="Get flag!" onclick="getFlag()" />
			</p>
		</div>
		<div>
			<p id="flagTitle"></p>
			<p id="flag"></p>
		</div>
	</body>
</html>

获得flag


function getFlag() {
				var token = document.getElementById("secToken").value;
				ic = checkToken(token);
				fg = bm(token);
				showFlag()
			}

输出flag


function showFlag() {
				var t = document.getElementById("flagTitle");
				var f = document.getElementById("flag");
				t.innerText = !!ic ? "You got the flag below!!" : "Wrong!";//判断ic是true还是flase
				t.className = !!ic ? "rightflag" : "wrongflag";
				f.innerText = fg;
			}

然后我们查看script-min.js其中改变ic的值的


function ck(s) {
    try {
        ic
    } catch (e) {
        return;
    }
    var a = [118, 104, 102, 120, 117, 108, 119, 124, 48,123,101,120];
    if (s.length == a.length) {
        for (i = 0; i < s.length; i++) {
            if (a[i] - s.charCodeAt(i) != 3)
                return ic = false;
        }
        return ic = true;
    }
    return ic = false;
}

我们读代码发现当a-我们输入的字符串等于3的时候ic就是true所以我们把它翻过来我这里用python写的


a=[118, 104, 102, 120, 117, 108, 119, 124, 48, 123, 101, 120]
b=''
for i in a:
	b+=chr(i-3)
print(b)

运行一下

得出结果

security-xbu

我们返回html输入这个值

就得出了，flag

RenIbyd8Fgg5hawvQm7TDQ

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