TMA-BOTTLEROCKET-1.4.2

Ensure address space layout randomization (ASLR) is enabled

MediumLevel 1Automatedbottlerocket

Description

Address space layout randomization (ASLR) is an exploit mitigation technique which randomly arranges the address space of key data areas of a process. The audit reads /proc/sys/kernel/randomize_va_space and requires 2. Run tmaegis on the host through the admin container root shell (sudo sheltie).

How it is checked

Audit method: Shell command

shell

bad=0
chk() { f=/proc/sys/$(printf %s "$1" | tr . /); v=$(cat "$f" 2>/dev/null) || { echo "$1: not readable"; bad=1; return; }; [ "$v" = "$2" ] || { echo "$1 = $v (expected $2)"; bad=1; }; }
chk kernel.randomize_va_space 2
[ "$bad" -eq 0 ] && echo compliant

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Run the following command to set the active kernel parameter and persist the setting: # apiclient apply <<EOF [settings.kernel.sysctl] "kernel.randomize_va_space" = "2" EOF

Properties

Operating systems: Any
Tags: bottlerocketsystem
Reference: CIS Bottlerocket Benchmark v1.0.0 - 1.4.2 Ensure address space layout randomization (ASLR) is enabled

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target bottlerocket