Re: Security Question

  • From: Pete Finnigan <pete@xxxxxxxxxxxxxxxx>
  • To: cjnewman@xxxxxxxxxxxxx
  • Date: Fri, 06 Feb 2009 09:22:51 +0000

Hi Christopher,

Thanks for your email. Yes you are right of course. I actually didnt
mean to suggest that block dumps were possible with alter session but
added the word block because of brain fade. I started to write the post
before I took my son to school, came back wrote a little more, mobile
rang, went to a meeting and then finsihed it. Its a mess..:-(. I was
really trying to convey two messages that are still valid. 1) that there
is always more than one way to the data and 2) trace (instrumentation)
can leave data outside the database where it is no longer secured.

Alex also picked up the same issue.

I have edited the post and replied to Alex's comment. The post is

Thanks for keeping me honest

kind regards


Newman, Christopher wrote:
> Pete Finnigan recently (yesterday) wrote a blog entry regarding
> instrumentation and security
> ( .  In one
> section it states "...Imagine that most users have the ALTER SESSION
> system privilege and therefore they can dump data blocks; imagine that
> we have secure some data in the table using VPD; this same method allows
> bypass of VPD."
> It was my understanding that ALTER SYSTEM was needed to dump blocks,
> *not* ALTER SESSION.  Can anyone clarify?
> Thanks - Chris
> --


Pete Finnigan
Director Limited

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