6.2.3.2 Ensure actions as another user are always logged
Audit#
On disk configuration Run the following command to check the on disk rules:
# awk '/^ *-a *always,exit/ \
&&/ -F *arch=b(32|64)/ \
&&(/ -F *auid!=unset/||/ -F *auid!=-1/||/ -F *auid!=4294967295/) \
&&(/ -C *euid!=uid/||/ -C *uid!=euid/) \
&&/ -S *execve/ \
&&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)' /etc/audit/rules.d/*.rules
Verify the output matches:
-a always,exit -F arch=b64 -C euid!=uid -F auid!=unset -S execve -k user_emulation
-a always,exit -F arch=b32 -C euid!=uid -F auid!=unset -S execve -k user_emulation
Running configuration Run the following command to check loaded rules:
# auditctl -l | awk '/^ *-a *always,exit/ \
&&/ -F *arch=b(32|64)/ \
&&(/ -F *auid!=unset/||/ -F *auid!=-1/||/ -F *auid!=4294967295/) \
&&(/ -C *euid!=uid/||/ -C *uid!=euid/) \
&&/ -S *execve/ \
&&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)'
Verify the output matches:
-a always,exit -F arch=b64 -S execve -C uid!=euid -F auid!=-1 -F key=user_emulation
-a always,exit -F arch=b32 -S execve -C uid!=euid -F auid!=-1 -F key=user_emulation
Remediation#
Create audit rules Edit or create a file in the /etc/audit/rules.d/ directory, ending in .rules extension, with the relevant rules to monitor elevated privileges. Example:
# printf "
-a always,exit -F arch=b64 -C euid!=uid -F auid!=unset -S execve -k user_emulation
-a always,exit -F arch=b32 -C euid!=uid -F auid!=unset -S execve -k user_emulation
" >> /etc/audit/rules.d/50-user_emulation.rules
Load audit rules Merge and load the rules into active configuration:
Check if reboot is required.