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cis-ubuntu1204-v110-8-1-12

DevOps & Security
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Collect Use of Privileged Commands

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.1.0/cis-ubuntu1204-v110-8-1-12/SKILL.md

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8.1.12 Collect Use of Privileged Commands (Scored)

Profile Applicability

  • Level 2

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

Using Command Line

Verify that an audit line for each setuid/setgid program identified in the find command appears in the audit file with the above attributes.

Run the following to find all setuid/setgid programs:

find PART -xdev \( -perm -4000 -o -perm -2000 \) -type f | awk '{print "-a always,exit -F path=" $1 " -F perm=x -F auid>=500 -F auid!=4294967295 -k privileged" }'

Expected Result

An audit line should exist for each setuid/setgid program found by the find command.

Remediation

Using Command Line

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>=500 - 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 will be tagged with the identifier "privileged."

find PART -xdev \( -perm -4000 -o -perm -2000 \) -type f | awk '{print "-a always,exit -F path=" $1 " -F perm=x -F auid>=500 -F auid!=4294967295 -k privileged" }'

Next, add those lines to the /etc/audit/audit.rules file.

Default Value

By default, use of privileged commands is not audited.

References

  • CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 2 - Scored