On Thu, 2008-05-01 at 12:02 +0100, Tony Arnold wrote:
> Seif,
> 
> Seif Attar wrote:
> 
> > I installed nessus on one ubuntu machine, and set the target to another
> > ubuntu machine on the lan, after it finished, the report had a lot of
> > warning and  threats, but I assume they are ok, as they are services i
> > know, and that i want running, one thing worried is a service running on
> > port 2000, nessus said it's sometimes used by trojan horses, my first
> > test was to access the server on that port with a web browser (epiphany)
> > the reponse was a file download "eX87YDOb.exe.part", which got me really
> > worried now! running "sudo netstat -n -tap | grep 2000" returns 
> > tcp        0      0 0.0.0.0:2000            0.0.0.0:*
> > LISTEN      6096/inetd
> > 
> > so if it's inetd, where does that file download come from?? should i be
> > worried? any links on what to do when you think your machine is
> > compromised?
> 
> Have a look in /etc/services to see what service port 2000 is known by.
> On my system, it says 'Seive mail filter daemon'. Also look in
> /etc/inetd.conf to see what inetd is listening for and what it invokes
> when a connection is received on port 2000.
> 

the relevant line in /etc/inetd.conf is:

2000 nobody /usr/sbin/tcpd /usr/sbin/nbdrootd /opt/ltsp/images/amd64.img

just googled what nndrootd does, and i guess mythtv installed it? or
it's used by it.

if i open the address host:2000 in a browser on a remote machine, i get
an exe.part file, if i do it localy, iget a bin.part file, i ran strings
on the files hoping to find something useful, all it had was NBDMAGIC,
why is inetd and ltsp returning these files? is this normal behaviour? 


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