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Linux CIFS本地权限提升漏洞通告【已复现】

  • 2026-07-01 19:44:01
Linux CIFS本地权限提升漏洞通告【已复现】

PART 01

漏洞综述
漏洞背景
Linux CIFS是Linux Kernel中用于挂载和访问SMB/CIFS网络文件共享的内核组件，常用于访问Windows文件共享、NAS及企业文件服务器。近日，新华三盾山实验室监测到Linux内核存在未编号的本地权限提升漏洞，该漏洞源于Linux CIFS未对cifs.spnego类型密钥的信息做来源合法性校验，导致本地低权限用户可以利用该漏洞提升为管理员权限。
漏洞详情
该漏洞源于内核未对cifs.spnego类型密钥的描述信息做来源合法性校验，本地低权限用户可以通过构造一个伪造的cifs.spnego密钥描述，并调用requestkey系统函数。该调用会触发系统以root权限启动cifs.upcall程序来处理这个伪造的密钥请求。随后，攻击者利用可控的pid和upcalltarget参数，使高权限的cifs.upcall进程切换到攻击者控制的命名空间。在该命名空间中，攻击者预置了恶意的NSS（名称服务交换）配置文件与动态链接库，当cifs.upcall执行NSS查询时，便会加载该恶意库，从而执行任意代码，最终实现完全的root权限提升，获取系统最高控制权。由于漏洞影响范围较大，建议用户尽快更新至最新版本。
漏洞复现

PART 02

影响范围
  • Linux Mint 21.3 / 22.3（Cinnamon）
  • CentOS Stream 9（GNOME）
  • Kali Linux 2021.4 / 2022.4 / 2023.4 / 2024.4 / 2025.4 / 2026.1（headless）
  • SUSE Linux Enterprise Server 15 SP7、SLES SAP 15 SP7、SLES SAP 16
  • AlmaLinux 9.7（Workstation / Azure cloud image）

PART 03

严重等级
威胁等级
高
影响程度
广泛
利用价值
高
利用难度
中等
漏洞评分
暂无

PART 04

处置方法
官方补丁
https://github.com/torvalds/linux/commit/3da1fdf4efbc490041eb4f836bf596201203f8f2

PART 05

参考链接
https://heyitsas.im/posts/cifswitch/
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
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  1. CONNECT:[ UseTime:0.001126s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001868s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002582s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000829s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001681s ]
  6. SELECT * FROM `set` [ RunTime:0.000706s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001858s ]
  8. SELECT * FROM `article` WHERE `id` = 497092 LIMIT 1 [ RunTime:0.004342s ]
  9. UPDATE `article` SET `lasttime` = 1783011641 WHERE `id` = 497092 [ RunTime:0.018368s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000283s ]
  11. SELECT * FROM `article` WHERE `id` < 497092 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000688s ]
  12. SELECT * FROM `article` WHERE `id` > 497092 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000491s ]
  13. SELECT * FROM `article` WHERE `id` < 497092 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026178s ]
  14. SELECT * FROM `article` WHERE `id` < 497092 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007814s ]
  15. SELECT * FROM `article` WHERE `id` < 497092 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020740s ]
0.261630s