Rule ID
SV-271761r1208732_rule
Version
V1R6
CCIs
ASLR makes it more difficult for an attacker to predict the location of attack code they have introduced into a process's 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.
Verify that OL 9 is implementing ASLR with the following command: $ sysctl kernel.randomize_va_space kernel.randomize_va_space = 2 Check that the configuration files are present to enable this kernel parameter: $ sudo grep -rs kernel.randomize_va_space /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf /etc/sysctl.d/*.conf /etc/sysctl.d/99-kernel_randomize_va_space.conf:kernel.randomize_va_space = 2 If "kernel.randomize_va_space" is not set to "2", or is missing, this is a finding. If conflicting results are returned, this is a finding.
Configure OL 9 to implement ASLR to protect its memory from unauthorized code execution. Add the configuration item with the following command: $ echo 'kernel.randomize_va_space = 2' | sudo tee /etc/sysctl.d/99-kernel_randomize_va_space.conf Remove any configurations that conflict with the above from the following locations: /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf /etc/sysctl.d/*.conf Reload settings from all system configuration files with the following command: $ sudo sysctl --system