qwik-smtpd format string

hotturk@xxxxxxxxx · 18 Feb 2007 05:12:26 -0000

Advisory          : H0tTurk-
Product           : qwik-smtpd (latest version).
Vendor            : http://qwikmail.sourceforge.net/
Bug           : format string vulnerability
Vendor Status     : Released Patch. http://qwikmail.sourceforge.net/smtpd/qwik-smtpd-0.3.patch 

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

File: qwik-smtpd.c

sprintf(Received,"Received: from %s (TURK %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.

Spc Thx:
Drmaxvirus,Gencturk,&#304;lkerkandemir,TiT,LuciferCihan,madconfig,tr-zindan,Theghost,SAWTURK,Ambassador,RidvanCihan,Crackers_Child,Kurtefendy,And Ayyildiz Vip TiM User,Soldiers