Re: QPopper 4.0.x buffer overflow vulnerability

[Torsten Mueller <torsten () archesoft de>]

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