CVE-2024-43882— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 exec 组件在设置uid/gid时存在ToCToU问题。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 9167b0b9a0ab7907191523f5a0528e3b9c288e21< d5c3c7e26275a2d83b894d30f7582a42853a958f |
affected |
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 368f6985d46657b8b466a421dddcacd4051f7ada |
affected | ||
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 15469d46ba34559bfe7e3de6659115778c624759 |
affected | ||
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 9b424c5d4130d56312e2a3be17efb0928fec4d64 |
affected | ||
9167b0b9a0ab7907191523f5a0528e3b9c288e21< f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1 |
affected | ||
9167b0b9a0ab7907191523f5a0528e3b9c288e21< d2a2a4714d80d09b0f8eb6438ab4224690b7121e |
affected | ||
9167b0b9a0ab7907191523f5a0528e3b9c288e21< 90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e |
affected | ||
9167b0b9a0ab7907191523f5a0528e3b9c288e21< f50733b45d865f91db90919f8311e2127ce5a0cb |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2024-43882 基础信息
漏洞信息
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Vulnerability Title
exec: Fix ToCToU between perm check and set-uid/gid usage
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
exec: Fix ToCToU between perm check and set-uid/gid usage
When opening a file for exec via do_filp_open(), permission checking is
done against the file's metadata at that moment, and on success, a file
pointer is passed back. Much later in the execve() code path, the file
metadata (specifically mode, uid, and gid) is used to determine if/how
to set the uid and gid. However, those values may have changed since the
permissions check, meaning the execution may gain unintended privileges.
For example, if a file could change permissions from executable and not
set-id:
---------x 1 root root 16048 Aug 7 13:16 target
to set-id and non-executable:
---S------ 1 root root 16048 Aug 7 13:16 target
it is possible to gain root privileges when execution should have been
disallowed.
While this race condition is rare in real-world scenarios, it has been
observed (and proven exploitable) when package managers are updating
the setuid bits of installed programs. Such files start with being
world-executable but then are adjusted to be group-exec with a set-uid
bit. For example, "chmod o-x,u+s target" makes "target" executable only
by uid "root" and gid "cdrom", while also becoming setuid-root:
-rwxr-xr-x 1 root cdrom 16048 Aug 7 13:16 target
becomes:
-rwsr-xr-- 1 root cdrom 16048 Aug 7 13:16 target
But racing the chmod means users without group "cdrom" membership can
get the permission to execute "target" just before the chmod, and when
the chmod finishes, the exec reaches brpm_fill_uid(), and performs the
setuid to root, violating the expressed authorization of "only cdrom
group members can setuid to root".
Re-check that we still have execute permissions in case the metadata
has changed. It would be better to keep a copy from the perm-check time,
but until we can do that refactoring, the least-bad option is to do a
full inode_permission() call (under inode lock). It is understood that
this is safe against dead-locks, but hardly optimal.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 exec 组件在设置uid/gid时存在ToCToU问题。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2024-43882 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-43882 其他参考 (7)
同批安全公告 · Linux · 2024-08-21 · 共 68 条
| CVE-2024-43881 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52910 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48871 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43878 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48883 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43877 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48892 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52913 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43880 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52907 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48872 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48873 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48874 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52903 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48887 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48878 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48899 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43872 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52909 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52897 | Linux kernel 安全漏洞 |
显示前 20 条，共 68 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-43882
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