Accepteer dat je wordt gehackt
Cyber security is een serieuze zaak. De bedreigingen die op ons afkomen beperken zich niet tot het missen van een aantal bestanden, het uitlekken van een adressenlijst of het uit de lucht halen van een website.
Inmiddels vormen IT-systemen een essentiële en serieuze rol in ons dagelijks leven. Het uitvallen of zelfs haperen van deze systemen kan drastische gevolgen hebben in de digitale en (more...)
The problem with using APEX authorization schemes in PL/SQL has been addressed several times in blogs and forums, but we occasionally still get questions on how to solve this:
I have a page where users with admin roles can modify data and other users can only view it. Hiding the button to save the record is easily done with an authorization scheme:
However, now I want my items to be displayed as “Read Only” too. There is (more...)
I think 2 years is long enough to wait between posts!
Today I delivered a session about Oracle Exadata Database Machine Best Practices and promised to post the slides for it (though no one asked about them :). I’ve also posted them to the Tech14 agenda as well.
Direct download: UKOUG Tech14 Exadata Security slides
I received an email from a team member yesterday
Have you seen this? https://docs.oracle.com/database/121/TDPPT/tdppt_awr_warehouse.htm
Interesting idea – ever thought of implementing it?
Well of course I have implemented a AWR data repository and I thought I would catch-up on where I am with it and how it is being used.
The database started out on HPUX on 126.96.36.199 about 2 years ago and is now on Linux on 11. (more...)
Disclaimer: I’m not posting to make me look better, we’ve all written code that we’re later ashamed of, and I’m no different!
This is some code from a system I was maintaining some time ago. I’ve kept it since then because it illustrates a number of things NOT to do:
FUNCTION password_is_valid (in_password IN VARCHAR2) -- do NOT copy this code!!! ... RETURN VARCHAR2 IS l_valid VARCHAR2(1); l_sql VARCHAR2(32000); CURSOR cur_rules IS SELECT REPLACE(sql_expression ,'#PASSWORD#' ,'''' (more...)
Just a quick note to point out that the October PSU was just released. The database has a few more vulnerabilities than usual (31), but they are mostly related to Java and the high CVSS score of 9 only applies to people running Oracle on windows. (On other operating systems, the highest score is 6.5.)
On the presentations page you can find the my presentation material from DOAG regional meeting September 2014 in Munich about “Enterprise User Security”.
How do I run procedure x after the user has logged in?This is often required for such tasks as determining user access, such as populating a restricted Application Item relating to a role like F_IS_ADMIN based on the username defined in substitition string APP_USER
Those new to APEX and unfamiliar with certain concepts may consider using an Application Computation, firing "On New Instance (more...)
The UTL_FILE database package is used to read from and write to operating system directories and files. By default, PUBLIC is granted execute permission on UTL_FILE. Therefore, any database account may read from and write to files in the directories specified in the UTL_FILE_DIR database initialization parameter [...] Security considerations with UTL_FILE can be mitigated by removing all directories from UTL_FILE_DIR and using the Directory functionality instead.
- Enterprise Manager 12c (EM) installed and agents rolled out to database servers
- Access to EM offered to development teams with the primary purpose of allowing them to investigate application related database performance issues
The EM documentation covers a selection of privileges you might want to grant to users in database targets in order to allow them to be used for accessing EM functionality. The privileges mentioned are:
- SELECT ANY DICTIONARY
- CREATE SESSION
- EXECUTE on (more...)
There are a lot of security admins out there that are going to hate me for this post. There are a lot of system administrators, developers, and users, however, that will LOVE me for this post. The code I'm about to share with you will keep the logged in PeopleSoft user's session active as long as the user has a browser window open that points to a PeopleSoft instance. Why would you do this? I (more...)
We’ve just had a leak of 900,000 national identifier numbers here in Denmark. That’s about 16% of the total population, so it’s pretty big. These numbers are unique identifiers for a person (similar to Social Security Numbers) and are a good starting point for identity theft.
Never ascribe to malice that which can adequately be explained by incompetence.
So how did these numbers leak? Through plain incompetence and lack of procedures. It (more...)
On Monday, a U.S. judge gave Microsoft control of 22 domains owned by domain hosting service No-IP.com. Microsoft intended to filter out some domains used by malware, but promptly screwed up. The result was that millions of legitimate users could not access their servers.
This will happen again and again as infrastructure moves to centralized cloud providers. What do you think will happen if the server just above yours in the server rack (more...)
Credit for finding this bug is given to Daniel Ekberg – https://www.linkedin.com/profile/view?id=10435009. He got the official credit given by Oracle Corp for helping out with security related bugs in the January 2014 CPU. He found the bug and had the tenacity to track down and prove that it was a bug and not just a flaw in the logging mechanism where this first was indicated to occur.
Today is the day when (more...)