cis-bind-v100-10-3

DevOps & Security

Ensure the named_t Process Type is Not in Permissive Mode (Automated)

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CIS 10.3 — Ensure the named_t Process Type is Not in Permissive Mode

Profile Applicability

Caching Only Name Server Level 2
Authoritative Name Server Level 2

Description

In addition to setting the entire SELinux configuration in permissive mode, it is possible to set individual process types (domains) such as named_t into a permissive mode as well. The permissive mode will not prevent any access or actions, instead, any actions that would have been denied are simply logged.

Rationale

Usage of the permissive mode is helpful for testing and ensuring that SELinux will not prevent access that is necessary for the proper function of the DNS server. However, inappropriate access will not be prevented in permissive mode by SELinux.

Impact

Not specified.

Audit Procedure

Perform the following steps to determine if the recommended state is implemented: Check that the named_t process type (domain) is not in permissive mode with the semodule command. There should be no output if the type is not set to permissive.

# semodule -l | grep permissive_named_t

Remediation

Perform the following to implement the recommended state:

If the named_t type is in permissive mode; the customized permissive mode should be deleted with the following semanage command.

# semanage permissive -d named_t

Default Value

The named_t type is not in permissive mode by default.

References

https://man7.org/linux/man-pages/man8/semanage-permissive.8.html

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v7	14.6 Protect Information through Access Control Lists	Y	Y	Y

MITRE ATT&CK Mappings

Tactic	Technique
Defense Evasion	T1562 Impair Defenses

Profile

Level 2 - Authoritative Name Server
Level 2 - Caching Only Name Server