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RHEL 9 must disable access to network bpf system call from nonprivileged processes.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-257810 | RHEL-09-213075 | SV-257810r958514_rule | Medium |
| Description |
|---|
| Loading and accessing the packet filters programs and maps using the bpf() system call has the potential of revealing sensitive information about the kernel state. Satisfies: SRG-OS-000132-GPOS-00067, SRG-OS-000480-GPOS-00227 |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-06-04 |
Details
| Check Text ( C-61551r952167_chk ) |
|---|
| Verify that RHEL 9 prevents privilege escalation through the kernel by disabling access to the bpf system call 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 that the configuration files are present to enable this kernel parameter. $ sudo /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F kernel.unprivileged_bpf_disabled | tail -1 kernel.unprivileged_bpf_disabled = 1 If the network parameter "kernel.unprivileged_bpf_disabled" is not equal to "1", or nothing is returned, this is a finding. |
| Fix Text (F-61475r925416_fix) |
|---|
| Configure RHEL 9 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 |