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Invalid sudo (Red Hat Enterprise Linux Server 6)

Microsoft.ACS.Linux.RHEL.6.Sudo.Invalid (Rule)

Rule to collect events for invalid call to sudo

Knowledge Base article:

Summary

An invalid 'sudo' command has been detected in the system log files.

Causes

User attempted to be granted access to privileged accounts. This monitor allows system administrators to track 'sudo' usage.

Resolutions

The description of the alert and/or the output data item contains information on the event encountered. If the activity appears suspicious, please check the associated event details and any other events that happened around the time of this event.

Element properties:

TargetMicrosoft.ACS.Linux.RHEL.6.ACSEndPoint
CategoryEventCollection
EnabledTrue
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Unix.SCXLog.Privileged.Datasource Default
WA WriteAction Microsoft.ACS.Unix.SecureEventLogWriter Default

Source Code:

<Rule ID="Microsoft.ACS.Linux.RHEL.6.Sudo.Invalid" Enabled="true" Target="Microsoft.ACS.Linux.RHEL.6.ACSEndPoint" Remotable="true">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="EventDS" TypeID="Unix!Microsoft.Unix.SCXLog.Privileged.Datasource">

      <Host>$Target/Host/Property[Type="Unix!Microsoft.Unix.Computer"]/NetworkName$</Host>

      <LogFile>/var/log/secure</LogFile>

      <!-- [TYPE] Redhat6 SUDO False -->

      <!-- [INPUT] Oct  5 07:16:39 scxcrd-rhel6-01 sudo:     root : user NOT in sudoers ; TTY=pts/1 ; PWD=/root ; USER=root ; COMMAND=/usr/bin/head /etc/sudoers -->

      <!-- [EXPECTED] date="Oct  5 07:16:39"; hostname="scxcrd-rhel6-01"; process="sudo"; user="root"; clientUser="root"; sessionName="/usr/bin/head /etc/sudoers" -->

      <RegExpFilter>\s+sudo: \s*\S+ : user NOT in sudoers ; TTY=.* ; USER=\S+ ; COMMAND=.*</RegExpFilter>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="ACS.Unix!Microsoft.ACS.Unix.SecureEventLogWriter">

      <RegExp>(?'date'\S+\s+\d+\s+\d+:\d+:\d+)\s+(?:\S+:)?(?'hostname'\S+)\s+(?'process'sudo): \s*(?'user'\S+) : user NOT in sudoers ; TTY=.* ; USER=(?'clientUser'\S+) ; COMMAND=(?'sessionName'.*)</RegExp>

      <EventType>0</EventType>

      <EventId>27003</EventId>

    </WriteAction>

  </WriteActions>

</Rule>