Re: service version disclosure

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On 01/07/2012 12:31 AM, Reindl Harald wrote:
> 
> Am 07.01.2012 06:13, schrieb Stephen John Smoogen:
>> On 6 January 2012 21:46, Kevin Kofler <kevin.kofler@xxxxxxxxx> wrote:
>>> Reindl Harald wrote:
>>>> would it not be a good idea to NOT disclosure service versions?
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=718133
>>>>
>>>> you will more and more have the "problem" of 3rd party
>>>> security scans to your servers and currently in the case
>>>> of openssh the only solution is to tkae the F16-src-rpm
>>>> and rebuild it for your F15 machines
>>>
>>> If the scan is looking at the version to determine vulnerability, it is
>>> completely broken, useless and unsupportable, because fixes can be
>>> backported.
> 
> if you have a big customer which hires a 3rd party auditor
> you are NOT in the poisiton to give such arguments or
> you can give them but you can not change ANYTHING in
> the fact that finally "fix it or shutdown the service"
> is what you have to do

If you have a "security expert" who can't grasp the concept of
back-ported bug fixes, and is unwilling to test for specific
vulnerabilities' existence, it's time to get a new expert.

>> I am going with Kevin on this one. The real hacking tools check to see
>> if a vulnerability works or not. The broken "audit" scanners only
>> check to see if a header is this or that. Not putting the header only
>> gets you past the auditors and doesn't stop the real hacker from
>> getting in if the vulnerability is there.
> 
> that is not the point
> the point is why in the wolrd must we spit out versions?
> 
> yes, i know it is security by obscurity
> but does it hurt?
> 
> if i need to know my version of sshd or any other service
> i make a "rpm -qa | grep package", if somebody else likes
> to know he has to tell the question as i have for foreign
> servers

Connecting programs don't have the luxury of 'rpm -q', and must rely on
the version returned by the server to know how to pass data. Things
change over time, and you certainly can't expect a server to behave the
same over (sometimes long) periods of time.

-- 
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