RHEL 9 file system automount function must be disabled unless required.

STIG ID: RHEL-09-231040  |  SRG: SRG-OS-000114-GPOS-00059 |  Severity: medium |  CCI: CCI-000366,CCI-000778,CCI-001958 |  Vulnerability Id: V-257849 | 

Vulnerability Discussion

An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message.

Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227

Check

Note: If the autofs service is not installed, this requirement is not applicable.

Verify that RHEL 9 file system automount function has been disabled with the following command:

$ sudo systemctl is-enabled autofs

masked

If the returned value is not "masked", "disabled", or "Failed to get unit file state for autofs.service for autofs", and is not documented as operational requirement with the information system security officer ISSO, this is a finding.

Fix

Configure RHEL 9 to disable the ability to automount devices.

The autofs service can be disabled with the following command:

$ sudo systemctl mask --now autofs.service
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