CVE-2021-41103— containerd 路径遍历漏洞

Insufficiently restricted permissions on plugin directories

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.

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对路径名的限制不恰当(路径遍历)

containerd 路径遍历漏洞

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。

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