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Assessment Title
Rule Text
All containers must be restricted from acquiring additional privileges.
Description
Discussion Text
To limit the attack surface of MKE, it is important that the nonessential services are not installed and access to the host system uses the concept of least privilege.
Restrict the container from acquiring additional privileges via suid or sgid bits.
A process can set the no_new_priv bit in the kernel. It persists across fork, clone, and execve. The no_new_priv bit ensures that the process or its children processes do not gain any additional privileges via suid or sgid bits. This way, many dangerous operations become a lot less dangerous because there is no possibility of subverting privileged binaries.
no_new_priv prevents LSMs like SELinux from transitioning to process labels that have access not allowed to the current process.
Restrict the container from acquiring additional privileges via suid or sgid bits.
A process can set the no_new_priv bit in the kernel. It persists across fork, clone, and execve. The no_new_priv bit ensures that the process or its children processes do not gain any additional privileges via suid or sgid bits. This way, many dangerous operations become a lot less dangerous because there is no possibility of subverting privileged binaries.
no_new_priv prevents LSMs like SELinux from transitioning to process labels that have access not allowed to the current process.
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