Tag Archives: bug

Bug: OLVM 4.3.10 upgrade might paint you into a corner

Oracle Linux VM comes with a nice feature that regularly checks for updates and allows you to deploy them in a rolling fashion to your cluster. Virtual machines are migrated away from one KVM host which is then upgraded and rebooted. Afterwards, the previously migrated machines are moved back to the upgraded host and the procedure runs again for the next host.

Which is nice, as long as everything works out…

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Although it’s a few days old, I’d like to point out an article by my colleague Markus Knies who had to deal with this vulnerability right on day zero:

Oracle released the quarterly critical patch updates on April 16th, 2019. Only one week later a zero-day vulnerability was identified by the KnownSec-404 security team. The vulnerability exists in Oracle Weblogic Server and has been labeled as CVE-2019-2725 and is also reported by the BSI (Bundesamt für Sicherheit in der Informationstechnik, Zero-Day-Schwachstelle in Oracle WebLogic Server, 25.04.2019).

Affected modules for this vulnerability are the wls9_async_response package with its components wls9_async and wls-wsat. With the help of these two modules it is possible to execute malicious content with elevated privileges.

Oracle reacted fast, broke the regular patch process, and launched an independent emergency patch on April 26th,2019:


Oracle reports that there is only an impact at the following versions: Oracle WebLogic Server, versions and

The BSI announces that all versions of Oracle WebLogic-Server are affected (also including the currently actual version

The vulnerability CVSS score for this issue is 9.8. It is highly recommended to install this patch as soon as possible in affected systems.

Related Links:

Oracle – Oracle Security Alert Advisory: https://www.oracle.com/technetwork/security-advisory/alert-cve-2019-2725-5466295.html

F5L2019 – F5 Labs: Twitter-Meldung: https://mobile.twitter.com/F5Labs/status/1120822404568244224/photo/1

Pag2019 – Pierluigi Paganini: „Zero-day vulnerability in Oracle WebLogic“: https://securityaffairs.co/wordpress/84450/breaking-news/oracle-weblogic-zeroday.html

Heise – Oracle WebLogic Server via Zero-Day-Lücke aus der Ferne angreifbar (26.04.2019): https://www.heise.de/security/meldung/Oracle-WebLogic-Server-via-Zero-Day-Luecke-aus-der-Ferne-angreifbar-4408439.html

Heise – Oracle patcht kritische Lücke in WebLogic Server außer der Reihe (29.04.2019): https://www.heise.de/security/meldung/Oracle-patcht-kritische-Luecke-in-WebLogic-Server-ausser-der-Reihe-4409153.html?wt_mc=rss.security.beitrag.atom

via Zero Day vulnerability in Oracle WebLogic Servers – Oracle Patch available | The Cattle Crew Blog

Historical SQL Plan from Statspack using DBMS_XPLAN in 12c

Up to Oracle 11.2 it was possible to display archived SQL plans from Statspack using DBMS_XPLAN. I make use of this in some of my scripts and SQL Developer Reports since I first saw this in Christian Antognini’s Book “Troubleshooting Oracle Performance“.
But in 12c (here: on Linux), there’s a piece missing now:

select * from table(dbms_xplan.display(
  table_name   => 'perfstat.stats$sql_plan',
  statement_id => null,
  format       => 'ALL -predicate -note',
  filter_preds => 'plan_hash_value = '|| &&phv

ERROR: an uncaught error in function display has happened; please contact Oracle support
Please provide also a DMP file of the used plan table perfstat.stats$sql_plan
ORA-00904: "TIMESTAMP": invalid identifier

So it looks like STATS$SQL_PLAN wasn’t synchronized to the changes in 12c’s PLAN_TABLE. Maybe because the timestamp wouldn’t make much sense there, anyway, maybe simply because Oracle forgot.

==> Quick and most certainly unsupported workaround:

ALTER TABLE perfstat.stats$sql_plan ADD timestamp INVISIBLE AS (cast(NULL AS DATE));

Another workaround could be to create a separate view with an additional dummy timestamp column an reference the view. I chose to stick with the invisible column solution so I won’t have to create new objects in the DB and change scripts to use these objects.

Hopefully, this will be solved in 12.2 – at least, I had filed an SR / Enhancement Request with Oracle Support.