CVE编号
CVE-2020-16120利用情况
暂无补丁情况
官方补丁披露时间
2021-02-11漏洞描述
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.解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接 |
|
|---|---|
| https://git.kernel.org/linus/05acefb4872dae89e772729efb194af754c877e8 | |
| https://git.kernel.org/linus/48bd024b8a40d73ad6b086de2615738da0c7004f | |
| https://git.kernel.org/linus/56230d956739b9cb1cbde439d76227d77979a04d | |
| https://git.kernel.org/linus/b6650dab404c701d7fe08a108b746542a934da84 | |
| https://git.kernel.org/linus/d1d04ef8572bc8c22265057bd3d5a79f223f8f52 | |
| https://launchpad.net/bugs/1894980 | |
| https://launchpad.net/bugs/1900141 | |
| https://ubuntu.com/USN-4576-1 | |
| https://ubuntu.com/USN-4577-1 | |
| https://ubuntu.com/USN-4578-1 | |
| https://www.openwall.com/lists/oss-security/2020/10/14/2 |
受影响软件情况
| # | 类型 | 厂商 | 产品 | 版本 | 影响面 | ||||
| 1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 运行在以下环境 | |||||||||
| 系统 | canonical | ubuntu_linux | 14.04 | - | |||||
| 运行在以下环境 | |||||||||
| 系统 | canonical | ubuntu_linux | 16.04 | - | |||||
| 运行在以下环境 | |||||||||
| 系统 | canonical | ubuntu_linux | 18.04 | - | |||||
| 运行在以下环境 | |||||||||
| 系统 | canonical | ubuntu_linux | 20.04 | - | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_10 | linux | * |
Up to (excluding) 4.19.235-1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | debian_9 | linux | * |
Up to (excluding) 4.9.240-2 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
Up to (excluding) 5.11 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.2 | linux | * |
Up to (excluding) 5.3.18-lp152.3.5.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle linux_7 | linux | * |
Up to (excluding) 4.14.35-2047.501.0.el7 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle linux_8 | linux | * |
Up to (excluding) 5.4.17-2036.104.4.el8 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle_7 | linux | * |
Up to (excluding) 4.14.35-2047.501.0.el7 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle_8 | linux | * |
Up to (excluding) 5.4.17-2036.104.4.el8 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | sles_12_SP5 | linux | * |
Up to (excluding) 4.12.14-16.34.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | suse_12_SP5 | linux | * |
Up to (excluding) 4.12.14-16.34.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_14.04 | linux | * |
Up to (excluding) 4.15.0-1098.109~14.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_14.04_lts | linux-azure | * |
Up to (excluding) 4.15.0-1098.109~14.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_16.04 | linux | * |
Up to (excluding) 4.15.0-1085.90~16.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_16.04_lts | linux-aws-hwe | * |
Up to (excluding) 4.15.0-1085.90~16.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04 | linux | * |
Up to (excluding) 5.4.0-1021.24~18.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04_lts | linux | * |
Up to (excluding) 4.15.0-121.123 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_20.04 | linux | * |
Up to (excluding) 5.4.0-1021.24 |
|||||
- 攻击路径 本地
- 攻击复杂度 复杂
- 权限要求 管控权限
- 影响范围 有限影响
- EXP成熟度 未验证
- 补丁情况 官方补丁
- 数据保密性 无影响
- 数据完整性 无影响
- 服务器危害 无影响
- 全网数量 100
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