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【漏洞通告】Linux CIFS本地提权漏洞

  • 2026-07-02 00:19:42
【漏洞通告】Linux CIFS本地提权漏洞

、漏洞概述

漏洞名称

Linux CIFS本地提权漏洞

CVEID

暂无

漏洞类型

权限提升

发现时间

2026-5-29

漏洞评分

8.8

漏洞等级

高危

攻击向量

网络

所需权限

利用难度

用户交互

不需要

PoC/EXP

已公开

在野利用

未发现

Linux CIFS客户端是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。cifs-utils是其配套用户态工具集,提供mount.cifs、cifs.upcall等程序,用于处理CIFS挂载、Kerberos/SPNEGO认证及相关密钥请求。

2026年5月29日,启明星辰安全应急响应中心(VSRC)监测到Linux CIFS本地提权漏洞。该漏洞源于内核侧未验证cifs.spnego key描述是否来自可信CIFS内核上下文,导致本地低权限用户可通过request_key伪造cifs.spnego描述,触发cifs.upcall以root权限运行,并利用受控pid、uid、creduid、upcall_target等字段切换至攻击者命名空间,在权限下降前加载恶意NSS模块,实现root代码执行。成功利用后可完全控制受影响主机,造成系统配置、业务数据和账号凭据泄露或篡改。

二、影响范围

Linux Kernel:未合入补丁3da1fdf4efbc490041eb4f836bf596201203f8f2的版本

cifs-utils >= 6.14

该漏洞利用还依赖以下条件同时满足:系统安装cifs-utils并保留默认cifs.spnego request-key规则;CIFS内核模块可加载或已编译进内核;允许非特权用户创建user namespace和mount namespace;SELinux、AppArmor等安全策略未阻断该利用链。部分发行版可能通过默认安全策略阻断PoC,但在策略放宽后仍可能受影响

安全措施

3.1 升级版本

官方已发布内核侧修复补丁,以修复该漏洞。。

修复提交为3da1fdf4efbc(“smb: client: reject userspace cifs.spnego descriptions”)。建议用户尽快升级至发行版厂商发布的安全内核版本,或更新至已合入该补丁的Linux Kernel版本。该补丁在内核侧为cifs.spnego key类型增加描述验证逻辑,仅允许CIFS使用spnego_cred发起的合法描述通过校验,从而阻断普通用户伪造cifs.spnego upcall并触发root权限cifs.upcall的利用路径,同时,建议持续关注cifs-utils官方及各Linux发行版安全公告,及时更新cifs-utils软件包。

下载链接:

https://github.com/torvalds/linux/commit/3da1fdf4efbc490041eb4f836bf596201203f8f2/

3.2 临时措施

如业务不需要SMB/CIFS挂载,禁止CIFS内核模块加载,或卸载cifs-utils。

如不需要Kerberos CIFS认证,删除或覆盖默认cifs.spnego request-key规则,例如:

cat >/etc/request-key.d/cifs.spnego.conf <<'EOF'

create cifs.spnego * * /usr/sbin/keyctl negate %k 30 %S

EOF

禁用非特权用户命名空间,降低本地低权限用户构造隔离命名空间并诱导root辅助程序切换的风险。

保持SELinux、AppArmor等强制访问控制策略开启,避免放宽相关user namespace、mount namespace及NSS模块加载限制。

加强request-key回调链路安全校验,避免用户态helper信任未经验证的pid、uid、creduid、upcall_target等字段。

cifs.upcall、request-key、keyctl、namespace创建行为进行审计和告警,重点关注低权限用户异常触发cifs.spnego upcall的行为。

避免在高权限辅助程序中基于攻击者可控命名空间执行NSS解析、动态库加载等敏感操作,防止在权限下降前加载不可信代码。

3.3 通用建议

  • 定期更新系统补丁减少系统漏洞,提升服务器的安全性

  • 加强系统和网络的访问控制,修改防火墙策略,关闭非必要的应用端口或服务,减少将危险服务(如SSH、RDP等)暴露到公网,减少攻击面。

  • 使用企业级安全产品,提升企业的网络安全性能。

  • 加强系统用户和权限管理,启用多因素认证机制和最小权限原则,用户和软件权限应保持在最低限度。

  • 启用强密码策略并设置为定期修改。

3.4参考链接

https://heyitsas.im/posts/cifswitch/

https://seclists.org/oss-sec/2026/q2/717

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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:0.000858s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000265s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000492s ]
  8. SELECT * FROM `article` WHERE `id` = 496182 LIMIT 1 [ RunTime:0.005566s ]
  9. UPDATE `article` SET `lasttime` = 1783005975 WHERE `id` = 496182 [ RunTime:0.005365s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000267s ]
  11. SELECT * FROM `article` WHERE `id` < 496182 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000446s ]
  12. SELECT * FROM `article` WHERE `id` > 496182 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001859s ]
  13. SELECT * FROM `article` WHERE `id` < 496182 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009511s ]
  14. SELECT * FROM `article` WHERE `id` < 496182 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008538s ]
  15. SELECT * FROM `article` WHERE `id` < 496182 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006664s ]
0.110322s