CVE-2020-16120— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux kernel Linux kernel
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 Overlayfs Unprivileged User中存在安全漏洞。该漏洞允许攻击者获取敏感信息。
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一、 漏洞 CVE-2020-16120 基础信息
漏洞信息
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Vulnerability Title
Unprivileged overlay + shiftfs read access
来源: CVE Program / CVE List V5
Vulnerability Description
Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be exploited from within a user namespace, if, for example, unprivileged user namespaces were allowed. It was possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef ("ovl: stack file ops"). This was fixed in kernel version 5.8 by commits 56230d9 ("ovl: verify permissions in ovl_path_open()"), 48bd024 ("ovl: switch to mounter creds in readdir") and 05acefb ("ovl: check permission to open real file"). Additionally, commits 130fdbc ("ovl: pass correct flags for opening real directory") and 292f902 ("ovl: call secutiry hook in ovl_real_ioctl()") in kernel 5.8 might also be desired or necessary. These additional commits introduced a regression in overlay mounts within user namespaces which prevented access to files with ownership outside of the user namespace. This regression was mitigated by subsequent commit b6650da ("ovl: do not fail because of O_NOATIMEi") in kernel 5.11.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
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 Overlayfs Unprivileged User中存在安全漏洞。该漏洞允许攻击者获取敏感信息。
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
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Linux kernel | Linux kernel | 5.11-stable ~ 5.11.0 | - |
|
二、漏洞 CVE-2020-16120 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2020-16120 厂商安全公告 (4)
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🔗 USN-4577-1: Linux kernel vulnerabilities | Ubuntu security notices | Ubuntu 查看完整文章 vendor-advisory x_refsource_UBUNTU
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🔗 Bug #1894980 “CVE-2020-16120: unprivileged overlayfs permission ...” : Bugs : linux package : Ubuntu 查看完整文章 vendor-advisory x_refsource_UBUNTU
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CVE-2020-16120 邮件列表归档 (1)
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https://www.openwall.com/lists/oss-security/2020/10/14/2 x_refsource_CONFIRM
CVE-2020-16120 其他参考 (6)
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https://git.kernel.org/linus/d1d04ef8572bc8c22265057bd3d5a79f223f8f52 x_refsource_CONFIRM
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https://git.kernel.org/linus/48bd024b8a40d73ad6b086de2615738da0c7004f x_refsource_CONFIRM
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https://git.kernel.org/linus/56230d956739b9cb1cbde439d76227d77979a04d x_refsource_CONFIRM
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https://git.kernel.org/linus/b6650dab404c701d7fe08a108b746542a934da84 x_refsource_CONFIRM
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https://git.kernel.org/linus/05acefb4872dae89e772729efb194af754c877e8 x_refsource_CONFIRM
IV. Related Vulnerabilities
V. Comments for CVE-2020-16120
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