I reproduced the state where inetd doesn't allow telnet, ftp, etc... I checked
the console as well as the messages log and found nothing, other than an xaudio
error message.
In the end, I think we are going to pound out xaudio in inetd.conf. These are
servers and don't do an xwindows at all.
Thanks for the info, it was very helpful.
Pete
----- Original Message -----
From: Devitto, Dom
To: nessus@list.nessus.org
Sent: Friday, July 13, 2007 11:47 AM
Subject: RE: Disable service identification
Michel is still right.
Inetd is trying to start the non-existent executable, when a connection is
made, and can't, so terminates the connection immediately.
Further connections from Nessus, with a short, or nearly no delay, do the
same, and inetd will detect this *perfectly correctly*, as a misconfigured
inetd.conf. As it's misconfigured it then backs off and doesn't allow any
further connections for a while. This is the documented behaviour of Solaris 8:
-r count interval
count and interval are decimal numbers that represent
the maximum count of invocations per interval of
seconds a service may be started before the service is
considered ``broken.''
Once considered ``broken,'' a server is suspended for
ten minutes. After ten minutes, inetd again enables
service, hoping the server behaves correctly.
If the -r flag is not specified, inetd behaves as
though -r40 60 was specified.
So you would expect, by default 40 connections in under 60 seconds of your
misconfigured Xaudio service to result in a 10 minute suspension of the Xaudio
service.
Anything beyond this behaviour (e.g. disabling telnet in any way) is a
Solaris 8 bug, and certainly nothing to do with Nessus.
Dom
Dom De Vitto | Security Consultant
Virgin Media, Crawley Court, Crawley, Winchester, Hants, SO21 2QA
M: 07855 805 271 D: 01483 87 5500 E: Dom.DeVitto@VirginMedia.co.uk
-----Original Message-----
From: nessus-bounces@list.nessus.org [mailto:nessus-bounces@list.nessus.org]
On Behalf Of Pete Duffin
Sent: 12 July 2007 22:34
To: Michel Arboi
Cc: nessus@list.nessus.org
Subject: Re: Disable service identification
I'll have a look in the morning regarding the messages you mentioned.
However, I pounded out xaudio in inetd.conf and the problem is now gone.
Interestingly enough, this is the line in inetd.conf:
xaudio stream tcp wait root
/usr/openwin/bin/Xaserver Xaserver -noauth -inetd
The binary /usr/openwin/bin/Xaserver does not exist on the box. Not sure
if that has something to do with it.
There are about 600 or so solaris 8 boxes, all with the same inetd.conf, all
with this problem. I'm hoping xaudio was the problem. They are servers, so
audio isn't needed.
----- Original Message -----
From: "Michel Arboi" <mikhail@nessus.org>
To: "Pete Duffin" <pduffin@blabbernet.net>
Cc: <nessus@list.nessus.org>
Sent: Thursday, July 12, 2007 4:40 PM
Subject: Re: Disable service identification
Le Thu, 12 Jul 2007 16:30:26 -0400,
"Pete Duffin" <pduffin@blabbernet.net> a écrit :
> Do you recall if xaudio has ever been a problem with Nessus?
No.
I am convinced that your problem is the classical rate limitation on
inetd. Have you seen something like "telnet/tcp server failing
(looping), service terminated" on your console or in /var/log/messages?
Solaris is not uncommon and I'd be very surprised if a denial of
service against such a critical component would have been unnoticed
until now.
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