The audit system must be configured to audit any usage of the lremovexattr system call.

From Canonical Ubuntu 16.04 Security Technical Implementation Guide

Part of SRG-OS-000037-GPOS-00015

Associated with: CCI-000130 CCI-000135 CCI-000169 CCI-000172 CCI-002884

SV-90405r3_rule The audit system must be configured to audit any usage of the lremovexattr system call.

Vulnerability discussion

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-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000462-GPOS-00206, SRG-OS-000463-GPOS-00207, SRG-OS-000471-GPOS-00215, SRG-OS-000474-GPOS-00219

Check content

Verify if the Ubuntu operating system is configured to audit the execution of the "lremovexattr" system call, by running the following command: # sudo grep -w lremovexattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b32 -S lremovexattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid=0 -k perm_mod If the command does not return all lines, or the lines are commented out, this is a finding.

Fix text

Configure the Ubuntu operating system to audit the execution of the "lremovexattr" system call, by adding the following lines to "/etc/audit/audit.rules": -a always,exit -F arch=b32 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b32 -S lremovexattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid=0 -k perm_mod The audit daemon must be restarted for the changes to take effect. To restart the audit daemon, run the following command: # sudo systemctl restart auditd.service

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