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Hide DNS Software Version on Sentora 1.0.3
Hide DNS Software Version on Sentora 1.0.3
Hi there,

It seems i am not able to Hide the Hide DNS Software Version in Sentora using named.conf on Bind. I added successfully the entry's as follows:

PHP Code:
// /etc/named.conf
options {
 // Hide bind version
 version "unknown";

Then i restarted the service:

PHP Code:
service named restart 

All was ok i checked the version too using this code:

PHP Code:
dig +short version.bind txt chaos 

In this case i got a return value of "unknown", problem is that it does not hide it. Now, this is a security problem since a new vulnerability maybe can be found in DNS software and script kiddies are scanning the Internet to exploit unpatched systems.

It's a best practice to hide software version on your DNS servers, although this is not a real protection it just makes a little harder to find your servers via scanning.

Any ideas why this is not working?
Thanks in advance
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RE: Hide DNS Software Version on Sentora 1.0.3
I haven't tried it yet, but will look into it this week.

Just tried the dig command and mine already says 'Hidden' Rolleyes

After more investigation, it does not seem possible to hide it 100%

After the suggested changes above, they all end with something like: "As usual, you can use fpdns to find out version number."
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Thanks given by: wormsunited
RE: Hide DNS Software Version on Sentora 1.0.3
Hi there i managed to do it under some of my servers, but for some reason that i cannot explain it does not work with fresh Sentora Installations. I mean i did made it for some of them, but on some others i could not.

My guess... I think the issue also depends on our registrar provider since i am using 2 companies, Godaddy and Name. At Godaddy i have the versions hidden, but on Name i do not. Maybe a request for the registrar can fix this issue? I will make a few more checks on this matter too and i will keep you all posted very soon.

Although the code is correct and the steps too.


There is 2 files at Sentora that needs to be changed, not just one. the named.conf exists in two
places, so its a good idea to modify both.

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