SV-26612r2: The kernel core dump data directory must have mode 0700 or less permissive. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Loading benchmark…

Assessment Title

Rule Text

The kernel core dump data directory must have mode 0700 or less permissive.

Description

Discussion Text

Kernel core dumps may contain the full contents of system memory at the time of the crash. As the system memory may contain sensitive information, it must be protected accordingly. If the mode of the kernel core dump data directory is more permissive than 0700, unauthorized users may be able to view or to modify kernel core dump data files.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225

Additional Details

Responsibility

System Administrator

References

DPMS Target Red Hat 5 DISA DPMS Target Red Hat 5 2154

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.rhel11:def:232
# The kernel core dump data directory must have mode 0700 or less permissive.
# 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:
#   - file_object (file_test) -- Kernel crash directory - configured path - mode 0700 or less: no extractor for field "gexec"
#   - file_object (file_test) -- Kernel crash directory - default path - mode 0700 or less: no extractor for field "gexec"
#   - file_object (file_test) -- Kernel crash directory - uuid - configured path - mode 0700 or less: no extractor for field "gexec"
#   - file_object (file_test) -- Kernel crash directory - uuid - default path - mode 0700 or less: no extractor for field "gexec"
#   - file_object (file_test) -- Kernel crash directory - label - configured path - mode 0700 or less: no extractor for field "gexec"
#   - file_object (file_test) -- Kernel crash directory - label - default path - mode 0700 or less: no extractor for field "gexec"

# No kernel crash device path is configured
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ! ( grep -Pq '^\s*(?:ext2|ext3|ext4|xfs|gfs|gfs2)\s+(/\S+)' '/etc/kdump.conf' &>/dev/null )
}
# Kernel crash directory path is not configured
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^\s*path\s+(\S+)' '/etc/kdump.conf' &>/dev/null
}
# Kernel crash directory path is configured
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  grep -Pq '^\s*path\s+(\S+)' '/etc/kdump.conf' &>/dev/null
}
# No kernel crash device UUID is configured
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  ! ( grep -Pq '^\s*(?:ext2|ext3|ext4|xfs|gfs|gfs2)\s+UUID=(\S+)' '/etc/kdump.conf' &>/dev/null )
}
# Kernel crash directory path is not configured
# textfilecontent54_object (textfilecontent54_test)
test_7() {
  grep -Pq '^\s*path\s+(\S+)' '/etc/kdump.conf' &>/dev/null
}
# Kernel crash directory path is configured
# textfilecontent54_object (textfilecontent54_test)
test_9() {
  grep -Pq '^\s*path\s+(\S+)' '/etc/kdump.conf' &>/dev/null
}
# No kernel crash device label is configured
# textfilecontent54_object (textfilecontent54_test)
test_11() {
  ! ( grep -Pq '^\s*(?:ext2|ext3|ext4|xfs|gfs|gfs2)\s+LABEL=(\S+)' '/etc/kdump.conf' &>/dev/null )
}
# Kernel crash directory path is not configured
# textfilecontent54_object (textfilecontent54_test)
test_12() {
  grep -Pq '^\s*path\s+(\S+)' '/etc/kdump.conf' &>/dev/null
}
# Kernel crash directory path is configured
# textfilecontent54_object (textfilecontent54_test)
test_14() {
  grep -Pq '^\s*path\s+(\S+)' '/etc/kdump.conf' &>/dev/null
}

if ( ( test_1 || ( test_2 && test_4 ) ) && ( test_6 || ( test_7 && test_9 ) ) && ( test_11 || ( test_12 && test_14 ) ) ); then
  echo "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
else
  echo "FAIL (or see MANUAL REVIEW note above)"
fi

Remediation

Set the permissions on the kernel core dump data directory to 0700.
# chmod 0700 <kernel core dump data directory>