Nmap Hackers: Re: fingerprinting problems

[Jesus Cea Avion <jcea () argo es>]

This message is authoritative, since it came from an official Solaris
developer:

> > > > >
Subject: 
         Re: Nmap network auditing/exploring tool V. 2.00 released
     Date: 
         Wed, 23 Dec 1998 10:12:57 +0100
    From: 
         Casper Dik <casper () HOLLAND SUN COM>
 Reply-To: 
         Bugtraq List <BUGTRAQ () netspace org>
      To: 
         BUGTRAQ () netspace org




> Another nmap-induced denial-of-service is against many machines inetd's
> when doing a TCP connect() scan (-sT) with the result of killing the inetd
> process.  I've found that Digital Unix and Irix have been vulnerable to
> this.  I cannot reliably reproduce the problem[*] and have not tested it
> against xinetd.

The TCP scan seems to be wide spread under inetd.

It's caused by the inetd "internal" TCP services; when a connection
is made and closed before a response can be send, inetd will die with
SIGPIPE.

This affects the services that do not fork() prior to running; discard,
echo and chargen do fork(), I believe, but time and daytime only send a
single respone and fork()ing wasn't deemed necessary.

It does affect Solaris prior to Solaris 7 (where it was fixed before it
was understood how easy it was to trigger)

Casper

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