The Oracle Linux operating system must audit all uses of the truncate syscall.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221795	OL07-00-030540	SV-221795r603260_rule		Medium

Description
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172

Description

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172

STIG	Date
Oracle Linux 7 Security Technical Implementation Guide	2021-06-14

Details

Check Text ( C-36312r602530_chk )
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "truncate" syscall occur. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep -iw truncate /etc/audit/audit.rules -a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access If both the "b32" and "b64" audit rules are not defined for the "truncate" syscall, this is a finding. If the output does not produce a rule containing "-F exit=-EPERM", this is a finding. If the output does not produce a rule containing "-F exit=-EACCES", this is a finding.

Check Text ( C-36312r602530_chk )

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "truncate" syscall occur.

Check the file system rules in "/etc/audit/audit.rules" with the following commands:

# grep -iw truncate /etc/audit/audit.rules

-a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access

-a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access

-a always,exit -F arch=b64 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access

-a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access

If both the "b32" and "b64" audit rules are not defined for the "truncate" syscall, this is a finding.

If the output does not produce a rule containing "-F exit=-EPERM", this is a finding.

If the output does not produce a rule containing "-F exit=-EACCES", this is a finding.

Fix Text (F-36276r602531_fix)
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "truncate" syscall occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access The audit daemon must be restarted for the changes to take effect.

Fix Text (F-36276r602531_fix)

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "truncate" syscall occur.

Add or update the following rule in "/etc/audit/rules.d/audit.rules":

-a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access

-a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access

-a always,exit -F arch=b64 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access

-a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access

The audit daemon must be restarted for the changes to take effect.