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Failed su (SUSE Linux Enterprise Server 10)

Microsoft.ACS.Linux.SLES.10.Su.Failed (Rule)

Rule to collect events for failed call to su

Knowledge Base article:

Summary

An unsuccessful 'su' 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 'su' 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.SLES.10.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.SLES.10.Su.Failed" Enabled="true" Target="Microsoft.ACS.Linux.SLES.10.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/messages</LogFile>

      <!-- [TYPE] SUSE SU False -->

      <!-- [INPUT] Aug 17 14:40:03 scxcore-suse01 su: FAILED SU (to root) jeffcof on /dev/pts/6 -->

      <!-- [EXPECTED] date="Aug 17 14:40:03"; hostname="scxcore-suse01"; process="su"; clientUser="root"; user="jeffcof" -->

      <RegExpFilter>su: FAILED SU \(to \S+\) \S+ on</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+(?&lt;process&gt;su):\s*FAILED\s+SU\s+\(to\s+(?&lt;clientUser&gt;\S+)\)\s+(?&lt;user&gt;\S+)</RegExp>

      <EventType>0</EventType>

      <EventId>27003</EventId>

    </WriteAction>

  </WriteActions>

</Rule>