The Red Hat Enterprise Linux operating system must use a file integrity tool that is configured to use FIPS 140-2 approved cryptographic hashes for validating file contents and directories.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-204500	RHEL-07-021620	SV-204500r792831_rule		Medium

Description
File integrity tools use cryptographic hashes for verifying file contents and directories have not been altered. These hashes must be FIPS 140-2 approved cryptographic hashes. Red Hat Enterprise Linux operating system installation media ships with an optional file integrity tool called Advanced Intrusion Detection Environment (AIDE). AIDE is highly configurable at install time. This requirement assumes the "aide.conf" file is under the "/etc" directory.

Description

File integrity tools use cryptographic hashes for verifying file contents and directories have not been altered. These hashes must be FIPS 140-2 approved cryptographic hashes. Red Hat Enterprise Linux operating system installation media ships with an optional file integrity tool called Advanced Intrusion Detection Environment (AIDE). AIDE is highly configurable at install time. This requirement assumes the "aide.conf" file is under the "/etc" directory.

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2022-09-12

Details

Check Text ( C-4624r792829_chk )
Verify the file integrity tool is configured to use FIPS 140-2-approved cryptographic hashes for validating file contents and directories. Check to see if AIDE is installed on the system with the following command: # yum list installed aide If AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. If there is no application installed to perform file integrity checks, this is a finding. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf Check the "aide.conf" file to determine if the "sha512" rule has been added to the rule list being applied to the files and directories selection lists. Exclude any log files, or files expected to change frequently, to reduce unnecessary notifications. An example rule that includes the "sha512" rule follows: All=p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux /bin All # apply the custom rule to the files in bin /sbin All # apply the same custom rule to the files in sbin If the "sha512" rule is not being used on all uncommented selection lines in the "/etc/aide.conf" file, or another file integrity tool is not using FIPS 140-2-approved cryptographic hashes for validating file contents and directories, this is a finding.

Check Text ( C-4624r792829_chk )

Verify the file integrity tool is configured to use FIPS 140-2-approved cryptographic hashes for validating file contents and directories.

Check to see if AIDE is installed on the system with the following command:

# yum list installed aide

If AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system.

If there is no application installed to perform file integrity checks, this is a finding.

Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory.

Use the following command to determine if the file is in another location:

# find / -name aide.conf

Check the "aide.conf" file to determine if the "sha512" rule has been added to the rule list being applied to the files and directories selection lists. Exclude any log files, or files expected to change frequently, to reduce unnecessary notifications.

An example rule that includes the "sha512" rule follows:

All=p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux
/bin All # apply the custom rule to the files in bin
/sbin All # apply the same custom rule to the files in sbin

If the "sha512" rule is not being used on all uncommented selection lines in the "/etc/aide.conf" file, or another file integrity tool is not using FIPS 140-2-approved cryptographic hashes for validating file contents and directories, this is a finding.

Fix Text (F-4624r792830_fix)
Configure the file integrity tool to use FIPS 140-2 cryptographic hashes for validating file and directory contents. If AIDE is installed, ensure the "sha512" rule is present on all uncommented file and directory selection lists. Exclude any log files, or files expected to change frequently, to reduce unnecessary notifications.