Re: NT/Exceed D.O.S.

[jal () THIRDAGE COM (Jamie Lawrence)]

I couldn't reproduce either effect with Exceed 6.1 under NTsp3.
Everything behaved normally, both for new and existing sessions.

-j

At 01:57 PM 4/28/99 -0700, Matt Wilbur wrote:
> Exceed (an X server, not an X emulator) version 6.0.1.0 on NT appears to
> have fixed this problem, somewhat...
>
> Telnetting to port 6000 locks the server up for 20-30 seconds, but it
> recovers eventually.  Not surprisingly, using netcat has the same effect...
> although, contrary to Chris's findings with Exceed 5, I didn't need to send
> any garbage characters, the connection alone did the job.  Also, it works
> from any host, not just the one the xdm session had been initiated with,
> regardless of host access settings in Xconfig, Exceeds "configuration" tool.
>
>
> I'd still consider this DoS-bait, when you imagine a one-liner to
> continuously connect to port 6000 of your favorite Exceed user's machine.
>
> Matt Wilbur
>
> [snip]
> > This is regarding Hummingbird's Exceed X emulator v5 (and possibly v6)
> > running on Windows NT.  I haven't tested Win95/98.
> >
> > The Exceed X server allows inbound TCP connections on port
> > 6000 from the XDM> host.  If someone uses telnet from the XDM host to
> connect to
> > a PC running Exceed on port 6000 and enters any garbage text, the X server
>
> > will hang and the Exceed session is frozen for good.
> >
> > I have notified Hummingbird via their tech support web site
> > but have not received a response yet.
> >
> > Chris LaFournaise
> > cjlafournaise () escocorp com