bugtraq - Re: QPopper 4.0.x buffer overflow vulnerability

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Message-ID: <3E6EFEE9.E9CF821@archesoft.de>
Date: Wed, 12 Mar 2003 10:33:29 +0100
From: Torsten Mueller <torsten@...hesoft.de>
To: Florian Heinz <heinz@...non-ag.de>
Subject: Re: QPopper 4.0.x buffer overflow vulnerability




Florian Heinz schrieb:
> 
> Hello,
> 
> Under certain conditions it is possible to execute arbitrary code using
> a buffer overflow in the recent qpopper.
> 
> You need a valid username/password-combination and code is (depending on
> the setup) usually executed with the user's uid and gid mail.
> 
...
> 
> This is the short version. An enhanced version with error-checking,
> bufsize- and return-address autodetection can be found on
> http://nstx.dereference.de/snippets/qex.c
> 
> Feedback is welcome.

... and here it comes ;-)

I tested http://nstx.dereference.de/snippets/qex.c
against 3 selfcompiled qpopper4.0.4 on 3 different machines.

I can confirm, that on one machine "it worked", i got
a shell.

More interesting for me is of course, if you can provide
a patch against 4.0.4 to close this vulnerability.

Greetings Torsten