STIGQter: STIG Summary: Red Hat Enterprise Linux 8 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

RHEL 8 must disable access to network bpf syscall from unprivileged processes.

DISA Rule

SV-230545r627750_rule

Vulnerability Number

V-230545

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-08-040281

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

Configure RHEL 8 to prevent privilege escalation thru the kernel by disabling access to the bpf syscall by adding the following line to a file in the "/etc/sysctl.d" directory:

kernel.unprivileged_bpf_disabled = 1

The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:

$ sudo sysctl --system

Check Contents

Verify RHEL 8 prevents privilege escalation thru the kernel by disabling access to the bpf syscall with the following commands:

$ sudo sysctl kernel.unprivileged_bpf_disabled

kernel.unprivileged_bpf_disabled = 1

If the returned line does not have a value of "1", or a line is not returned, this is a finding.

Vulnerability Number

V-230545

Documentable

False

Rule Version

RHEL-08-040281

Severity Override Guidance

Verify RHEL 8 prevents privilege escalation thru the kernel by disabling access to the bpf syscall with the following commands:

$ sudo sysctl kernel.unprivileged_bpf_disabled

kernel.unprivileged_bpf_disabled = 1

If the returned line does not have a value of "1", or a line is not returned, this is a finding.

Check Content Reference

M

Target Key

2921

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