Detections
Analytics

1.315 ALMA-09-040830

Information

AlmaLinux OS 9 must restrict exposed kernel pointer addresses access.

GROUP ID: V-269423
RULE ID: SV-269423r1117266

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".

Solution

Configure AlmaLinux OS 9 to restrict exposed kernel pointer addresses access with the following command:

$ echo "kernel.kptr_restrict = 1" > /etc/sysctl.d/60-kptr.conf

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

$ sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/27039

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-2, CCI|CCI-001082, Rule-ID|SV-269423r1117266_rule, STIG-ID|ALMA-09-040830, Vuln-ID|V-269423

Plugin: Unix

Control ID: a6765b0d60bc5f29bf26678a59bbdf89260bf429fc5aacfd24fd5809dff0397e