SV-227692r603266: The /etc/shells (or equivalent) file must exist. | Solaris 10 X86 STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

The /etc/shells (or equivalent) file must exist.

Description

Discussion Text

The shells file (or equivalent) lists approved default shells. It helps provide layered defense to the security approach by ensuring users cannot change their default shell to an unauthorized shell that may not be secure.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366V-916SV-40806

References

DPMS Target Solaris 10 X86 DISA DPMS Target Solaris 10 X86 4061

Checks

DISA STIG (Manual Reference)

Verify /etc/shells exists.
# ls -l /etc/shells
If the file does not exist, 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.

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.fso.solaris11:def:137 compliance check
if [ ! -d "/etc" ]; then echo "FAIL"; exit 1; fi
if [ ! -f "/etc/shells" ]; then echo "FAIL"; exit 1; fi
if [ "$(stat -c "%a" "/etc/shells")" -ne 644 ]; then echo "FAIL"; exit 1; fi
if [ "$(grep -c "/bin/bash" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/csh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/jsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/ksh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/pfcsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/pfksh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/pfsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/sh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/tcsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/bin/zsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/sbin/jsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/sbin/sh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/bash" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/csh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/jsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/ksh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/pfcsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/pfksh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/pfsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/sh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/tcsh" "/etc/shells")" -eq 0 ] || [ "$(grep -c "/usr/bin/zsh" "/etc/shells")" -eq 0 ]; then echo "FAIL"; exit 1; fi
echo "PASS"; exit 0

Remediation

Create a /etc/shells file containing a list of valid system shells.  The list below contains the default shells from the shells(4) man page.

Procedure (the command is 24 lines long):
cat >/etc/shells <<EOF
/bin/bash
/bin/csh
/bin/jsh
/bin/ksh
/bin/pfcsh
/bin/pfksh
/bin/pfsh
/bin/sh
/bin/tcsh
/bin/zsh
/sbin/jsh
/sbin/sh
/usr/bin/bash
/usr/bin/csh
/usr/bin/jsh
/usr/bin/ksh
/usr/bin/pfcsh
/usr/bin/pfksh
/usr/bin/pfsh
/usr/bin/sh
/usr/bin/tcsh
/usr/bin/zsh
EOF