All uses of the mount command must be audited.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Part of SRG-OS-000042-GPOS-00020

Associated with: CCI-000135 CCI-002884

SV-86795r5_rule All uses of the mount command must be audited.

Vulnerability discussion

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.At a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172

Check content

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "mount" command occur. Check for the following system calls being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": # grep -iw "mount" /etc/audit/audit.rules -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b32 -F path=/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b32 -F path=/usr/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -F path=/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -F path=/usr/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount If all uses of the mount command are not being audited, this is a finding.

Fix text

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "mount" command occur. Add or update the following rules in "/etc/audit/rules.d/audit.rules": Note: The rules are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be configured. -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b32 -F path=/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b32 -F path=/usr/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -F path=/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -F path=/usr/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount The audit daemon must be restarted for the changes to take effect.

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