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2001 Dec 30 17:06

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

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Re: [vox-tech] Attempted access -- I think
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Re: [vox-tech] Attempted access -- I think



On Wed, 13 Jun 2001, Cam Ellison wrote:

> I managed to get it into more readable format -- the text appears below
> the copied message.
> 
> Cam
> 
> 
> Cam Ellison wrote:
> > 
> > I haven't had much of a firewall set up (laziness coupled with too
> > little time), but I added a few lines to ipchains the other day, mostly
> > a set that blocked 192.168.x.x from outside the network.  Lo! and
> > behold!  I get these interesting entries that suggest my system has been
> > compromised.  The attached text is from syslog, and has been repeated,
> > along with other variants, ever since I added those lines.
> > 
> > What should I do now?  There is no obvious way in which my system has
> > been affected, but I notice that these entries are use the bootp ports
> > (67 and 68), so I am quite suspicious.
> > 
> > Any ideas would be most helpful.
> > 
> > Sorry for using an attachment -- I still haven't gotten around to
> > jettisoning Netscape and using a proper mail system.  Maybe security
> > ought to come first?

Looks like it.

> > 
> >
> >   ------------------------------------------------------------------------
> > 
> > Jun 13 16:44:28 treehouse kernel: Packet log: eth-in DENY eth1
> > PROTO=17 192.168.177.11:67 255.255.255.255:68 L=328 S=0x00 I=48460
> > F=0x0000 T=128 (#1)

This is a dhcp reply (bootp). In isolation, nothing to worry about, but
when you consider the source address is private, it starts to look kind of
weird...

> > Jun 13 17:08:47 treehouse kernel: Packet log: eth-in DENY eth1
> > PROTO=17 192.168.0.1:5005 255.255.255.255:5005 L=44 S=0x00 I=27137
> > F=0x0000 T=128 (#1)

... and this is an odd one... broadcast to 5005...  examine the output of
"netstat -ua" to see if treehouse would have responded to this, and use 
"lsof -i :5005" to find out which process(es) is(are) handling that port.

> > Jun 13 17:41:33 treehouse kernel: Packet log: eth-in DENY eth1
> > PROTO=17 192.168.190.3:1052 255.255.255.255:38293 L=44 S=0x00 I=46693
> > F=0x0000 T=32 (#1)

Another odd one.  The fact that these all have different private
source addresses is also strange.

The fact that these are not directed at your ip address in particular is a
little comforting, but someone is playing strange games.

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