CIS Ubuntu 14.04 LTS - 4.1.12 Ensure use of privileged commands is collected

DevOps & Security

Collect audit events for execution of setuid and setgid privileged programs

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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