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CVE-2021-41103— Insufficiently restricted permissions on plugin directories

Quick assessment

Affected
containerd containerd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 containerd 存在路径遍历漏洞，该漏洞源于容器根目录和一些插件的权限没有受到足够的限制。攻击者可利用该漏洞使得没有特权的Linux用户可以遍历目录内容和执行程序。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.52% · P42
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I. Basic Information for CVE-2021-41103

Vulnerability Information
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Vulnerability Title
Insufficiently restricted permissions on plugin directories
Source: CVE Program / CVE List V5
Vulnerability Description
containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
containerd 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 containerd 存在路径遍历漏洞，该漏洞源于容器根目录和一些插件的权限没有受到足够的限制。攻击者可利用该漏洞使得没有特权的Linux用户可以遍历目录内容和执行程序。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
containerd containerd < 1.4.11 -

II. Public POCs for CVE-2021-41103

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III. Intelligence Information for CVE-2021-41103

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Patches & Fixes for CVE-2021-41103 (1)

Vendor Advisories for CVE-2021-41103 (3)

Mailing List Discussions for CVE-2021-41103 (2)

IV. Related Vulnerabilities

Same product: containerd
Same vendor: containerd
Same weakness: CWE-22

V. Comments for CVE-2021-41103

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