SV-274005r1198253: Amazon Linux 2023 must restrict usage of ptrace to descendant processes. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must restrict usage of ptrace to descendant processes.

Description

Discussion Text

Unrestricted usage of ptrace allows compromised binaries to run ptrace on other processes of the user. Like this, the attacker can steal sensitive information from the target processes (e.g., SSH sessions, web browser, etc.) without any additional assistance from the user (i.e., without resorting to phishing).

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001082

References

DPMS Target Amazon Linux 2023 DISA DPMS Target Amazon Linux 2023 5700

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.amzlx23os:def:274005
# Amazon Linux 2023 must restrict usage of ptrace to descendant processes.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# kernel.yama.ptrace_scope setting in kernel is set to 1
# sysctl_object (sysctl_test)
test_1() {
  [ "$(cat /proc/sys/kernel/yama/ptrace_scope)" -eq 1 ]
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# oval:mil.disa.stig.amzlx23os:def:274005

if [ ! -f "/etc/sysctl.d/99-sysctl.conf" ]; then echo "PASS"; exit 0; fi
if grep -q "^kernel.yama.ptrace_scope = 1$" /etc/sysctl.d/99-sysctl.conf; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Configure Amazon Linux 2023 to restrict usage of ptrace to descendant processes by adding the following line to a file, in the "/etc/sysctl.d" directory:

kernel.yama.ptrace_scope = 1

The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:

$ sudo sysctl --system