SV-227862r603266: Anonymous FTP accounts must not have a functional shell. | Solaris 10 X86 STIG SCAP Benchmark

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Assessment Title

Rule Text

Anonymous FTP accounts must not have a functional shell.

Description

Discussion Text

If an anonymous FTP account has been configured to use a functional shell, attackers could gain access to the shell if the account is compromised.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366V-4387SV-4387

References

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

Checks

DISA STIG (Manual Reference)

Check the shell for the anonymous FTP account.

Procedure:
# grep "^ftp" /etc/passwd

This is a finding if the seventh field is empty (the entry ends with a ':') or if the seventh field does not contain one of the following.

/bin/false
/dev/null
/usr/bin/false
/bin/true
/sbin/nologin

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:290
# Anonymous FTP accounts must not have a functional shell.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# ftp account has appropriate shell
# password_object (password_test)
test_1() {
  (getent passwd '^ftp' | cut -d: -f7) | grep -Pq '^(/bin/false|/dev/null|/usr/bin/false|/bin/true|/sbin/nologin)$'
}

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 definition: oval:mil.disa.fso.solaris11:def:290
if [ ! -f "/etc/passwd" ]; then echo "PASS"; exit 0; fi
grep -E '^ftp[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:/(bin/false|/dev/null|/usr/bin/false|/bin/true|/sbin/nologin)' /etc/passwd > /dev/null
if [ $? -eq 0 ]; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Configure anonymous FTP accounts to use a non-functional shell. If necessary, edit the /etc/passwd file to remove any functioning shells associated with the FTP account and replace them with non-functioning shells, such as, /dev/null.