The SLES for vRealize must implement non-executable data to protect its memory from unauthorized code execution.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-240520	VRAU-SL-001335	SV-240520r671301_rule		Medium

Description
Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory include, for example, data execution prevention and address space layout randomization. Data execution prevention safeguards can either be hardware-enforced or software-enforced with hardware providing the greater strength of mechanism. Examples of attacks are buffer overflow attacks.

Description

Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory include, for example, data execution prevention and address space layout randomization. Data execution prevention safeguards can either be hardware-enforced or software-enforced with hardware providing the greater strength of mechanism. Examples of attacks are buffer overflow attacks.

STIG	Date
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide	2021-06-24

Details

Check Text ( C-43753r671299_chk )
The stock kernel has support for non-executable program stacks compiled in by default. Verify that the option was specified when the kernel was built: # grep -i "execute" /var/log/boot.msg The message: "NX (Execute Disable) protection: active" will be written in the boot log when compiled in the kernel. This is the default for x86_64. To activate this support, the “noexec=on” kernel parameter must be specified at boot time. Check for a message with the following command: # grep –i "noexec" /var/log/boot.msg The message: "Kernel command line: noexec=on" will be written to the boot log when properly appended to the /boot/grub/menu.lst file. If non-executable program stacks have not been configured, this is a finding.

Check Text ( C-43753r671299_chk )

The stock kernel has support for non-executable program stacks compiled in by default. Verify that the option was specified when the kernel was built:

# grep -i "execute" /var/log/boot.msg

The message: "NX (Execute Disable) protection: active" will be written in the boot log when compiled in the kernel. This is the default for x86_64.

To activate this support, the “noexec=on” kernel parameter must be specified at boot time. Check for a message with the following command:

# grep –i "noexec" /var/log/boot.msg

The message: "Kernel command line: noexec=on" will be written to the boot log when properly appended to the /boot/grub/menu.lst file.

If non-executable program stacks have not been configured, this is a finding.

Fix Text (F-43712r671300_fix)
Edit the /boot/grub/menu.lst file and add “noexec=on” to the end of each kernel line entry. A system restart is required to implement this change.