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The system must implement virtual address space randomization.


Overview

Finding ID Version Rule ID IA Controls Severity
V-208848 OL6-00-000078 SV-208848r793633_rule Medium
Description
Address space layout randomization (ASLR) makes it more difficult for an attacker to predict the location of attack code he or she has introduced into a process's address space during an attempt at exploitation. Additionally, ASLR also makes it more difficult for an attacker to know the location of existing code in order to repurpose it using return oriented programming (ROP) techniques.
STIG Date
Oracle Linux 6 Security Technical Implementation Guide 2021-12-03

Details

Check Text ( C-9101r357524_chk )
The status of the "kernel.randomize_va_space" kernel parameter can be queried by running the following commands:

$ sysctl kernel.randomize_va_space
$ grep kernel.randomize_va_space /etc/sysctl.conf

The output of the command should indicate a value of at least "1" (preferably "2"). If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf".
If the correct value is not returned, this is a finding.
Fix Text (F-9101r357525_fix)
To set the runtime status of the "kernel.randomize_va_space" kernel parameter, run the following command:

# sysctl -w kernel.randomize_va_space=2

If this is not the system's default value, add the following line to "/etc/sysctl.conf":

kernel.randomize_va_space = 2