cyberstrikeus 4.1.12 Ensure use of privileged commands is collected (Scored)
Profile Applicability
- Level 2 - Server
- Level 2 - Workstation
Description
Monitor privileged programs (those that have the setuid and/or setgid bit set on execution) to determine if unprivileged users are running these commands.
Rationale
Execution of privileged commands by non-privileged users could be an indication of someone trying to gain unauthorized access to the system.
Audit Procedure
Run the following command replacing <partition> with a list of partitions where programs can be executed from on your system:
find <partition> -xdev \( -perm -4000 -o -perm -2000 \) -type f | awk '{print \
"-a always,exit -F path=" $1 " -F perm=x -F auid>=1000 -F auid!=4294967295 \
-k privileged" }'
Verify all resulting lines are in the /etc/audit/audit.rules file and the output of auditctl -l.
Expected Result
All setuid/setgid binaries should have corresponding audit rules.
Remediation
To remediate this issue, the system administrator will have to execute a find command to locate all the privileged programs and then add an audit line for each one of them. The audit parameters associated with this are as follows:
-F path=" $1 " - will populate each file name found through the find command and processed by awk. -F perm=x - will write an audit record if the file is executed. -F auid>=1000 - will write a record if the user executing the command is not a privileged user. -F auid!= 4294967295 - will ignore Daemon events.
All audit records should be tagged with the identifier "privileged".
Run the following command replacing with a list of partitions where programs can be executed from on your system:
find <partition> -xdev \( -perm -4000 -o -perm -2000 \) -type f | awk '{print \
"-a always,exit -F path=" $1 " -F perm=x -F auid>=1000 -F auid!=4294967295 \
-k privileged" }'
Add all resulting lines to the /etc/audit/audit.rules file.
Notes: Reloading the auditd config to set active settings may require a system reboot.
Default Value
Not configured by default.
References
- CIS Controls v6.1 - 5.1 Minimize And Sparingly Use Administrative Privileges
Profile
- Level 2 - Server
- Level 2 - Workstation