Detections
Analytics

1.310 OL09-00-002408

Information

OL 9 must restrict exposed kernel pointer addresses access.

GROUP ID: V-271747
RULE ID: SV-271747r1117266

Exposing kernel pointers (through procfs or "seq_printf()") exposes kernel writeable structures, which may contain functions pointers. If a write vulnerability occurs in the kernel, allowing write access to any of this structure, the kernel can be compromised. This option disallows any program without the CAP_SYSLOG capability to get the addresses of kernel pointers by replacing them with "0".

Satisfies: SRG-OS-000132-GPOS-00067, SRG-OS-000433-GPOS-00192

Solution

Configure OL 9 to prevent the leak of kernel pointers to unprivileged users.

Add or edit the following line in /etc/sysctl.d/99-sysctl.conf system configuration file:

kernel.kptr_restrict = 1

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/27024

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION, SYSTEM AND INFORMATION INTEGRITY

References: 800-53|SC-2, 800-53|SI-16, CCI|CCI-001082, CCI|CCI-002824, Rule-ID|SV-271747r1117266_rule, STIG-ID|OL09-00-002408, Vuln-ID|V-271747

Plugin: Unix

Control ID: c6c5d031590ce98c355200be82df3db257d953be78378f549951df13827fef0d