SV-216218r959010: The system must require authentication before allowing modification of the boot devices or menus. Secure the GRUB Menu (Intel). | Solaris 11 X86 STIG SCAP Benchmark

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Assessment Title

Rule Text

The system must require authentication before allowing modification of the boot devices or menus. Secure the GRUB Menu (Intel).

Description

Discussion Text

The flexibility that GRUB provides creates a security risk if its configuration is modified by an unauthorized user. The failsafe menu entry needs to be secured in the same environments that require securing the systems firmware to avoid unauthorized removable media boots.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366V-48001SV-60873

References

DPMS Target Solaris 11 X86 DISA DPMS Target Solaris 11 X86 4021

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.solaris11:def:31
# The system must require authentication before allowing modification of the boot devices or menus. Secure the GRUB Menu (Intel).
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
#   - uname_object (uname_test) -- OS version is less than 11.4: no extractor for field "os_version"
#   - uname_object (uname_test) -- OS version is not less than 11.4: no extractor for field "os_version"
#   - textfilecontent54_object (textfilecontent54_test) -- GRUB must have a superuser set in custom.cfg.: cannot derive an existence probe for this object type
#   - textfilecontent54_object (textfilecontent54_test) -- GRUB must have a password set in custom.cfg.: cannot derive an existence probe for this object type
#   - textfilecontent54_object (textfilecontent54_test) -- GRUB must have a custom.cfg set in grub.cfg.: cannot derive an existence probe for this object type

# /etc/zones/index does not exist
# file_object (file_test)
test_2() {
  ! ( test -e '/etc/zones/index' &>/dev/null )
}
# /etc/zones/index contains global
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  grep -Pq '^global:' '/etc/zones/index' &>/dev/null
}
# /var/share/zones/index.json does not exist
# file_object (file_test)
test_5() {
  ! ( test -e '/var/share/zones/index.json' &>/dev/null )
}
# /var/share/zones/index.json does not contain 'path:/'
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  ! ( grep -Pq '"path":\s+"/"' '/var/share/zones/index.json' &>/dev/null )
}

if ( ( test_2 || test_3 ) && ( test_5 || test_6 ) ); then
  echo "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
else
  echo "FAIL (or see MANUAL REVIEW note above)"
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.solaris11:def:31
if [ $(uname -r) = "global" ]; then
    if [ ! -f /rpool/boot/grub/custom.cfg ]; then
        echo "FAIL"
        exit 1
    fi
    if ! grep -q "password_pbkdf2" /rpool/boot/grub/custom.cfg; then
        echo "FAIL"
        exit 1
    fi
else
    echo "PASS"
fi
exit 0

Remediation

The root role is required.

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

# zonename

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

Update GRUB to use a custom configuration file.

# pfedit /rpool/boot/grub/grub.cfg
Insert the line:
source $prefix/custom.cfg

Create a password hash.

# /usr/lib/grub2/bios/bin/grub-mkpasswd-pbkdf2
Enter password: 
Reenter password: 
Your PBKDF2 is .......
Copy the long password hash in its entirety.

# pfedit /rpool/boot/grub/custom.cfg
Insert the lines:
set superusers="[username]"
password_pbkdf2 [username] [password hash]

Restart the system.