-= Unl0ck Team Security Advisory =-

        ____ ___       __  _______           __      ___________
       |    |   \____ |  | \   _  \    ____ |  | __  \__    ___/___ _____    _____
       |    |   /    \|  | /  /_\  \_ / ___\|  |/ /    |    |_/ __ \\__  \  /     \
       |    |  /   |  \  |_\  \_/   \  \___ |    <     |    |\  ___/ / __ \|  Y Y  \
       |______/|___|  /____/\_____  /\_____ >__|_ \    |____| \___  >____  /__|_|  /
                    \/            \/       \/    \/               \/     \/      \/
                         ... the best way of protection is attack

                         http://unl0ck.net.ru || http://unl0ck.info
                         
Advisory          : #9 by unl0ck team
Product           : qwik-smtpd (latest version).
Vendor            : http://qwikmail.sourceforge.net/
Date              : 31.10.2004
Impact            : format string vulnerability
Vendor Status     : Released Patch. http://qwikmail.sourceforge.net/smtpd/qwik-smtpd-0.3.patch
Advisory URL      : http://unl0ck.info/advisories/qwik-smtpd.txt

-=[ Overview

It is an SMTP (mail) server that supports SMTP and ESMTP. Once finished,
it will be very secure, hopefully with the same reputation as qmail.

  ]=-

-=[ Vulnerability

I found format string bug in Qwik-SMTP daemon.
See this:

File: qwik-smtpd.c

sprintf(Received,"Received: from %s (HELO %s) (%s) by %s with SMTP; %s\n", clientHost,
clientHelo, clientIP, localHost, timebuf);
...
          else
          {
            fprintf(fpout,Received);
...

As you can see, bug found in main() function. This type is REMOTE.
We don't want to release an exploit to avoid kids usage.

-=[ Credits

Found this bug Dark Eagle
mailto:darkeagle@list.ru

(c) Darkeagle
  ]=-