RE: ASP security in HTML pages

From: Calderon, Juan Carlos (GE Commercial Finance, NonGE) (juan.calderon_at_ge.com)
Date: 06/28/04

  • Next message: Michael Chilcott: "Network Discovery & Asset Management Tools"
    Date: Mon, 28 Jun 2004 11:22:11 -0400
    To: Bénoni MARTIN <Benoni.MARTIN@libertis.ga>, "Wolf, Yonah" <Yonah.Wolf@ujc.org>, <security-basics@securityfocus.com>, <webappsec@securityfocus.com>
    
    

    Hi!

    From my point of view the easiest way is to use the "frendly" pages to show code like ShowCode.asp page at IIS samples.

    (Background)
    http://support.microsoft.com/default.aspx?scid=kb;en-us;232449

    (Exploit)
    http://www.atstake.com/research/advisories/1999/showcode.txt

    (Both)
    http://www.securityfocus.com/infocus/1317

    Cheers
    JC

    -----Original Message-----
    From: Bénoni MARTIN [mailto:Benoni.MARTIN@libertis.ga]
    Sent: Thursday, June 24, 2004 4:11 AM
    To: Wolf, Yonah; security-basics@securityfocus.com;
    webappsec@securityfocus.com
    Subject: RE: ASP security in HTML pages

    Well, it seems I have not been very shape in my last posting. I know ASP code is executed on the server's side, and not in the client's browser (it will just receive the results of the scriting).

    But if a client requests "toto.asp", despite of if it will receive the "toto.asp" WITHOUT the ASP scripts, the server has a "full toto.asp" WITH the asp scripts. So my question was: as the server has in his directory this "full toto.asp", is there a way to get the "full toto.asp" from the server?

    -----Message d'origine-----
    De : Wolf, Yonah [mailto:Yonah.Wolf@ujc.org]
    Envoyé : mercredi 23 juin 2004 14:37
    À : Bénoni MARTIN; security-basics@securityfocus.com; webappsec@securityfocus.com
    Objet : RE: ASP security in HTML pages

    Martin,

     I am not quite sure what you are asking?

            Are you asking about 'Classic' asp? Classic ASP code is intertwined with HTML in a .ASP file. It is executed server side. The end user cannot 'see' the ASP code, even if they look at the source because the code is executed at run time and never sent to the browser. So long as your server and the original code is secure then end users can't see the code.

            Are you talking about client-side VBScript/JavaScript that runs in the browser? If so, it is very hard to hide that from the browser because the browser needs to be able to read it to execute the code.

            Or, are you talking about an ASP application that you plan on selling/deploying and putting on a clients' server. And not wanting them to get access to the code? If this is the case, and you are using ASP.NET you can use the code obfuscator to blur the code. If you're using classic ASP, I believe you are S.O.O.L.

    HTH,
    --Yonah

    -----Original Message-----
    From: Bénoni MARTIN [mailto:Benoni.MARTIN@libertis.ga]
    Sent: Tuesday, June 22, 2004 7:42 AM
    To: security-basics@securityfocus.com; webappsec@securityfocus.com
    Subject: ASP security in HTML pages

    Hi list,

    I have been googling around to know how secure can be ASP code, and I found what follows:
    - For a newbee, impossible to get the asp scripts inserted in an HTML page as they are not displayed in the client's browser,
    - Instead of just letting the ASP code in the HTML pages, we can create some DLLs for example, but a not-to-bad skilled hacker can get and reverse them.

    So, my question to you, skilled-people :) is: is there a way to get the asp scripts in a page the server does not send when a client's request arrives? There should be a way to ^perform that, but how tough is it?

    Thanks in advance, folks!

    ---------------------------------------------------------------------------
    Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off
    any course! All of our class sizes are guaranteed to be 10 students or less
    to facilitate one-on-one interaction with one of our expert instructors.
    Attend a course taught by an expert instructor with years of in-the-field
    pen testing experience in our state of the art hacking lab. Master the skills
    of an Ethical Hacker to better assess the security of your organization.
    Visit us at:
    http://www.infosecinstitute.com/courses/ethical_hacking_training.html
    ----------------------------------------------------------------------------

    ---------------------------------------------------------------------------
    Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off
    any course! All of our class sizes are guaranteed to be 10 students or less
    to facilitate one-on-one interaction with one of our expert instructors.
    Attend a course taught by an expert instructor with years of in-the-field
    pen testing experience in our state of the art hacking lab. Master the skills
    of an Ethical Hacker to better assess the security of your organization.
    Visit us at:
    http://www.infosecinstitute.com/courses/ethical_hacking_training.html
    ----------------------------------------------------------------------------


  • Next message: Michael Chilcott: "Network Discovery & Asset Management Tools"