The Red Hat Enterprise Linux operating system must audit all uses of the removexattr syscall.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-72117	RHEL-07-030470	SV-86741r5_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). Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033

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). Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2019-09-25

Details

Check Text ( C-72349r7_chk )
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "removexattr" syscall occur. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep -iw removexattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "removexattr" syscall, this is a finding.

Check Text ( C-72349r7_chk )

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

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

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

-a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod

-a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod

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

Fix Text (F-78469r7_fix)
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "removexattr" syscall occur. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod The audit daemon must be restarted for the changes to take effect.

Fix Text (F-78469r7_fix)

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

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

-a always,exit -F arch=b32 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod

-a always,exit -F arch=b64 -S removexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod

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