OL 9 must implement address space layout randomization (ASLR) to protect its memory from unauthorized code execution.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271761 | OL09-00-002423 | SV-271761r1091995_rule | CCI-002824 | medium |
| Description | ||||
| ASLR makes it more difficult for an attacker to predict the location of attack code they have introduced into a process' address space during an attempt at exploitation. Additionally, ASLR makes it more difficult for an attacker to know the location of existing code to repurpose it using return-oriented programming (ROP) techniques. | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-271761r1091995_chk)
Verify that OL 9 is implementing ASLR with the following command:
$ sysctl kernel.randomize_va_space
kernel.randomize_va_space = 2
If "kernel.randomize_va_space" is not set to "2" or is missing, this is a finding.
Fix Text (F-75718r1091994_fix)
Configure OL 9 to implement address space layout randomization (ASLR) to protect its memory from unauthorized code execution.
Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory:
kernel.randomize_va_space = 2
Reload settings from all system configuration files with the following command:
$ sudo sysctl --system