Re: local telnetd DoS

From: Signal 11 (signal11at_private)
Date: Fri Sep 10 1999 - 09:03:33 PDT

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    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
    



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