[11846] in bugtraq
Re: local telnetd DoS
daemon@ATHENA.MIT.EDU (Signal 11)
Sat Sep 11 16:45:21 1999
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-Id: <37D92BD5.D86FDE9@mediaone.net>
Date: Fri, 10 Sep 1999 11:03:33 -0500
Reply-To: Signal 11 <signal11@MEDIAONE.NET>
From: Signal 11 <signal11@MEDIAONE.NET>
X-To: Zo0mer <slackware@MAIL.RU>
To: BUGTRAQ@SECURITYFOCUS.COM
Zo0mer wrote:
>
> Hi,i found local DoS that Crash telnetd (tested on Slackware 4.0, RH 5.2)
> type
> telnet localhost | telnet localhost | telnet localhost ...... about 50 times
> result will be 'Connection Refused' , telnetd crash.
That's not a telnet DoS - you're hitting inetd's builtin connection limit.
The default is to shutdown the service if more than 40 instances are started
in a 60 second period. *Any* service under inetd will halt if more than the max number of instances are started.
Change this line in inetd.conf:
telnet stream tcp nowait root /usr/sbin/tcpd in.telnetd
To:
telnet stream tcp nowait.256 root /usr/sbin/tcpd in.telnetd
And try your "DoS" again.
--
Signal 11, BOFH to the UF list and malign.net
"I never get to do anything fun." -- Calvin
