STIGQter: STIG Summary: Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 10 Mar 2021:

The Ubuntu operating system must implement address space layout randomization to protect its memory from unauthorized code execution.

DISA Rule

SV-238369r654282_rule

Vulnerability Number

V-238369

Group Title

SRG-OS-000433-GPOS-00193

Rule Version

UBTU-20-010448

Severity

CAT II

CCI(s)

• CCI-002824 - The information system implements organization-defined security safeguards to protect its memory from unauthorized code execution.

Weight

10

Fix Recommendation

Remove the "kernel.randomize_va_space" entry found in the "/etc/sysctl.conf" file or any file located in the "/etc/sysctl.d/" directory.

After the line has been removed, the kernel settings from all system configuration files must be reloaded before any of the changes will take effect. Run the following command to reload all of the kernel system configuration files:

$ sudo sysctl --system

Check Contents

Verify the Ubuntu operating system implements address space layout randomization (ASLR) with the following command:

$ sudo sysctl kernel.randomize_va_space

kernel.randomize_va_space = 2

If nothing is returned, verify the kernel parameter "randomize_va_space" is set to "2" with the following command:

$ cat /proc/sys/kernel/randomize_va_space

2

If "kernel.randomize_va_space" is not set to "2", this is a finding.

Verify that a saved value of the "kernel.randomize_va_space" variable is not defined.

$ sudo egrep -R "^kernel.randomize_va_space=[^2]" /etc/sysctl.conf /etc/sysctl.d

If this returns a result, this is a finding.

Vulnerability Number

V-238369

Documentable

False

Rule Version

UBTU-20-010448

Severity Override Guidance

Verify the Ubuntu operating system implements address space layout randomization (ASLR) with the following command:

$ sudo sysctl kernel.randomize_va_space

kernel.randomize_va_space = 2

If nothing is returned, verify the kernel parameter "randomize_va_space" is set to "2" with the following command:

$ cat /proc/sys/kernel/randomize_va_space

2

If "kernel.randomize_va_space" is not set to "2", this is a finding.

Verify that a saved value of the "kernel.randomize_va_space" variable is not defined.

$ sudo egrep -R "^kernel.randomize_va_space=[^2]" /etc/sysctl.conf /etc/sysctl.d

If this returns a result, this is a finding.

Check Content Reference

M

Target Key

5318

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