The SLES for vRealize audit system must be configured to audit user deletions of files and programs.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-89849	VRAU-SL-001460	SV-100499r1_rule		Medium

Description
Auditing file deletions will create an audit trail for files that are removed from the system. The audit trail could aid in system troubleshooting, as well as detecting malicious processes that attempt to delete log files to conceal their presence.

STIG	Date
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide	2018-10-12

Details

Check Text ( C-89541r1_chk )
To determine if the system is configured to audit calls to the "unlink" system call, run the following command: # auditctl -l \| grep syscall \| grep unlink \| grep -v unlinkat If the system is configured to audit this activity, it will return several lines. If it does not, this is a finding. To determine if the system is configured to audit calls to the "unlinkat" system call, run the following command: # auditctl -l \| grep syscall \| grep unlinkat If the system is configured to audit this activity, it will return several lines. If it does not, this is a finding. To determine if the system is configured to audit calls to the "rename" system call, run the following command: # auditctl -l \| grep syscall \| grep rename \| grep -v renameat If the system is configured to audit this activity, it will return several lines. If it does not, this is a finding. To determine if the system is configured to audit calls to the "renameat" system call, run the following command: # auditctl -l \| grep syscall \| grep renameat If the system is configured to audit this activity, it will return several lines. If it does not, this is a finding.

Check Text ( C-89541r1_chk )

To determine if the system is configured to audit calls to the "unlink" system call, run the following command:

# auditctl -l | grep syscall | grep unlink | grep -v unlinkat

If the system is configured to audit this activity, it will return several lines.

If it does not, this is a finding.

To determine if the system is configured to audit calls to the "unlinkat" system call, run the following command:

# auditctl -l | grep syscall | grep unlinkat

If the system is configured to audit this activity, it will return several lines.

If it does not, this is a finding.

To determine if the system is configured to audit calls to the "rename" system call, run the following command:

# auditctl -l | grep syscall | grep rename | grep -v renameat

If the system is configured to audit this activity, it will return several lines.

If it does not, this is a finding.

To determine if the system is configured to audit calls to the "renameat" system call, run the following command:

# auditctl -l | grep syscall | grep renameat

If the system is configured to audit this activity, it will return several lines.

If it does not, this is a finding.

Fix Text (F-96591r1_fix)
Edit the audit.rules file and add the following line(s) to enable auditing of deletions of files and programs: -a always,exit -F arch=b64 -S unlink -S unlinkat -S rename -S renameat -F auid=0 -a always,exit -F arch=b64 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 -F auid!=4294967295 -a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid=0 -a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 -F auid!=4294967295

Fix Text (F-96591r1_fix)

Edit the audit.rules file and add the following line(s) to enable auditing of deletions of files and programs:

-a always,exit -F arch=b64 -S unlink -S unlinkat -S rename -S renameat -F auid=0
-a always,exit -F arch=b64 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 -F auid!=4294967295
-a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid=0
-a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid>=500 -F auid!=4294967295