RE: Question regarding Oracle listener port change

True, but there is no sense making it easier for them.

Liz

From: [External] oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of [External] Andy Sayer Sent: Friday, April 05, 2019 1:41 PM
To: bdbafh_at_gmail.com
Cc: Bill Ferguson <wbfergus_at_gmail.com>; oracle-l <oracle-l_at_freelists.org>; watt0012_at_umn.edu Subject: Re: Question regarding Oracle listener port change

Using a non-default listener port offers the same additional security as installing your front door slightly to the right of your porch.

Back in 11g times, the listener had some very critical security vulnerabilities so maybe it was worthwhile advise back then - but it wasn’t exactly going to prevent anything other than a very lazy attack.

My 2c,
Andy

On Fri, 5 Apr 2019 at 18:30, Paul Drake <bdbafh_at_gmail.com<mailto:bdbafh_at_gmail.com>> wrote: Bill,

Ah.
Perhaps if a consultant issued the edict?

How about an oldie but goodie?
(Blows dust off a copy fetched from the office bookshelf)

SANS Step-by-Step series
Oracle Security step by step v 2.0
Pete Finnegan
SANS Press 2004
Phase 5 - Networking.
Action 5.1.6
"Avoid running the listener on the normal (tcp) ports of 1521 or 1526."

CIS has a controls doc for Oracle databases including versions 11gR2 and 12c. Apparently changing the port number from default is not mentioned. They're more on board with making certain that admin commands occur over IPC and not remote tcp in the clear.

Perhaps NIST does as well. Nope. They refer to the CIS document.

Something to chew upon.

Paul

On Fri, Apr 5, 2019, 10:36 AM Andy Wattenhofer <watt0012_at_umn.edu<mailto:watt0012_at_umn.edu>> wrote: That's not a problem that is unique to government, in my experience. It seems to be more a function of size and bureaucracy. In some cases I would even say that private sector is worse, given the profit motive and the fact that security doesn't deliver profit.

Andy

On Fri, Apr 5, 2019 at 9:02 AM Bill Ferguson <wbfergus_at_gmail.com<mailto:wbfergus_at_gmail.com>> wrote: I tried using a different port roughly 10 years back, and the rest of my organization really got their feathers ruffled. and I finally had to switch it back to 1521. The overwhelming majority of "DBA's" within my Federal Government organization, don't know anything about Oracle, like most of their software, and install everything with the defaults. I've tried getting the higher level "management" to issue a few basic security mandates about changing the ports, not installing with (or at least de-activating) default settings, etc., and it just falls on deaf ears. When I try doing a mass email to alert the other Oracle "DBA's", I'd usually get an official slap on the wrist and told to quit rocking the boat. Anyway, I think this is a huge part of the problem with security of Government databases. The people that brown-nosed their way into the positions where they can dictate the policy and direction of the organization have absolutely no idea of what they placed in charge of, and what would be the most common-sense way of approaching the issue. But it is partly because of these security failures that I never mention which Department or Agency I work for. It could possibly open us up to a more concentrated attack, and I also do not want any of opinions to be considered as indicative of the official position or opinion of the group I work for (big legal headaches there). bill Ferguson

On Thu, Mar 28, 2019 at 5:48 PM DRCDBA (Gmail) <drcdba_at_gmail.com<mailto:drcdba_at_gmail.com>> wrote: Personally I don't keep any database - internal or external facing - on port 1521. Just don't like default settings I guess!

On Mar 28, 2019, at 5:12 PM, Mark W. Farnham <mwf_at_rsiz.com<mailto:mwf_at_rsiz.com>> wrote: I’m just curious.

Doesn’t everyone with a public network wan change the 1521 port and put a honey pot on 1521 to absorb attack vectors?

Do folks actually leave it as 1521 for systems that allow off-closed-campus access?

mwf

From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Rakesh Ra Sent: Wednesday, March 27, 2019 9:18 AM To: Shane Borden
Cc: Oracle-L Freelists
Subject: Re: Question regarding Oracle listener port change

Hi All,

Just to keep you all updated, the reason for port 1521 working was , we had teleran software installed which was internally swapping the port from 1521 to 1621. Below is the snippet from teleran logs.

managettds.log:03/23/2019 20:05:19:589 TT03235 <INFO> (genericdb) Connecting to Knowledge Base: jdbc:oracle:thin:_at_//xxxxx-scan:1521/<SID> managettds.log:03/23/2019 20:05:29:312 TT00712 <INFO> (ttsystem) Swapping Oracle port from 1521 to 1621

Regards,
Rakesh RA

On Tue, Mar 26, 2019 at 5:32 PM Shane Borden <sborden76_at_gmail.com<mailto:sborden76_at_gmail.com>> wrote: Did you change the ports on both the scan and the local listener? Update the database parameters and re-register?

Shane Borden
sborden76_at_gmail.com<mailto:sborden76_at_gmail.com> Sent from my iPhone

> On Mar 26, 2019, at 7:50 AM, Rakesh Ra <rakeshra.tr_at_gmail.com<mailto:rakeshra.tr_at_gmail.com>> wrote:
>
> Hi All,
>
> We have full rack exadata server X5 version with 11.2.0.4<https://urldefense.proofpoint.com/v2/url?u=http-3A__11.2.0.4&d=DwQFaQ&c=j-EkbjBYwkAB4f8ZbVn1Fw&r=yWMFosURAngbt8VLeJtKLVJGefQxustAZ9UxecV7xpc&m=czIaBKk274PoSNtvtXWN0bq3d9_rHAmiURVcu11xwIY&s=G9eqlm-mB-fu9lzMsWLTYz1XmR8nS3UXM-jEbd124Oc&e=> version DB running on it.. We changed the port number of scan and local listener from 1521 to 1621.
> I tried connecting to the database remotely using scan and default service with port 1521 , connection is going through. I also tried connecting to the database using scan and default service using 1621 port as well. With that also I am able to connect. Should I ideally get my connection request with port 1521 rejected with some TNS errors?? Or is this is expected??
>
> Regards,
> Rakesh RA

--
-- Bill Ferguson
--