The Photon operating system must restrict access to the kernel message buffer.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-258828 | SRG-OS-000138-GPOS-00069 | PHTN-40-000067 | SV-258828r958524_rule | 2024-07-11 | 2 |
| Description |
|---|
| Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional system information as a nonprivileged user. |
| ℹ️ Check |
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| At the command line, run the following command to verify kernel message buffer restrictions are enabled: # /sbin/sysctl kernel.dmesg_restrict Example result: kernel.dmesg_restrict = 1 If the "kernel.dmesg_restrict" kernel parameter is not set to "1", this is a finding. |
| ✔️ Fix |
|---|
| Navigate to and open: /etc/sysctl.d/zz-stig-hardening.conf Add or update the following line: kernel.dmesg_restrict = 1 At the command line, run the following command to load the new configuration: # /sbin/sysctl --load /etc/sysctl.d/zz-stig-hardening.conf Note: If the file zz-stig-hardening.conf does not exist, it must be created. |