SV-226886r603265: The system must implement non-executable program stacks. | Solaris 10 SPARC STIG SCAP Benchmark

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Assessment Title

Rule Text

The system must implement non-executable program stacks.

Description

Discussion Text

A common type of exploit is the stack buffer overflow. An application receives, from an attacker, more data than it is prepared for and stores this information on its stack, writing beyond the space reserved for it. This can be designed to cause execution of the data written on the stack. One mechanism to mitigate this vulnerability is for the system to not allow the execution of instructions in sections of memory identified as part of the stack.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366CCE-4297-8SV-27412V-11999

References

DPMS Target Solaris 10 SPARC DISA DPMS Target Solaris 10 SPARC 4060

Checks

DISA STIG (Manual Reference)

This check applies to the global zone only. Determine the type of zone that you are currently securing.

# zonename

If the command output is "global", this check applies.

Determine if the system implements non-executable program stacks.
# grep noexec_user_stack /etc/system

If the noexec_user_stack is not set to 1, this is a finding.

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.fso.solaris11:def:436
# The system must implement non-executable program stacks.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/zones/index does not exist
# file_object (file_test)
test_1() {
  ! ( test -e '/etc/zones/index' &>/dev/null )
}
# /etc/zones/index contains global
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^global:' '/etc/zones/index' &>/dev/null
}
# "noexec_user_stack" is set to "1" in /etc/system.
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  [ "$(sed -En 's/^\s*set\s+noexec_user_stack\s*=\s*(\d+)$/\1/p' '/etc/system')" -eq 1 ]
}

if ! ( test_1 || test_2 || test_3 ); 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
# Implementing DISA STIG / SCAP compliance check: oval:mil.disa.fso.solaris11:def:436

if [ "$(grep -E '^global:' /etc/zones/index | wc -l)" -ge 1 ]; then
    if [ ! -f /etc/system ]; then
        echo "FAIL"
        exit 1
    fi
    if [ "$(grep -E '^\\s*set\\s+noexec_user_stack\\s*=\\s*1$' /etc/system | wc -l)" -ge 1 ]; then
        echo "PASS"
        exit 0
    fi
    echo "FAIL"
    exit 1
else
    echo "PASS"
    exit 0
fi

Remediation

This action applies to the global zone only. Determine the type of zone that you are currently securing.

# zonename

If the command output is "global", this action applies.

Edit /etc/system and set the noexec_user_stack parameter to 1.  Restart the system for the setting to take effect.