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Re: QPopper 4.0.x buffer overflow vulnerability
From: Torsten Mueller <torsten () archesoft de>
Date: Wed, 12 Mar 2003 10:33:29 +0100

Florian Heinz schrieb:


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

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

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