full-disclosure - Re: Full Path Disclosure in most wordpress' plugins [?]

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Date: Tue, 29 Sep 2009 15:25:48 +0200
From: "Jan G.B." <ro0ot.w00t@...glemail.com>
To: "Fernando A. Lagos B." <fernando@...ial.org>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Full Path Disclosure in most wordpress'
	plugins [?]

Not that I think this is serious, but I like if, when the first thing a
include file does is to check if a defined term *is* defined.<?php
   if (!is_defined('MY_CONFIG_VAR_GUESS_WP_HAS_SOME_TOO'))
      die ("NSA is watching you.");
?>

Filenames can change. a definer like INCLUDE_DIR would rather not.



2009/9/29 Fernando A. Lagos B. <fernando@...ial.org>

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Glafkos Charalambous wrote:
> > Hello,
> >
>
> Hi Glafkos,
>
> >
> >
> > That definitely can be fixed easily with two lines of code but is still
> > something that should have been prevented at earlier stages of "plugin"
> > development
> >
> >
> >
> > "if (!empty($_SERVER['SCRIPT_FILENAME']) && 'akismet.php' ==
> > basename($_SERVER['SCRIPT_FILENAME']))
> >
> >  die ('Please do not load this page directly');"
> >
> >
>
> It is a simple and good fix.
>
> >
> > From the server side you can set PHP "warning" and "errors" OFF either
> > through php.ini or PHP page itself but sometimes that's not an option
>
> Yep, if you disable the "display_errors" option on php.ini is not a good
> option. Setting display_erros to Off hides the problem but not fix the
> problem.
>
> >
> >
> >
> > Regards,
>
> cheers
>
> >
> > Glafkos Charalambous
> >
> >
> >
> >
> >
> > *From:* full-disclosure-bounces@...ts.grok.org.uk
> > [mailto:full-disclosure-bounces@...ts.grok.org.uk] *On Behalf Of
> *majinboo
> > *Sent:* Monday, September 28, 2009 11:12 PM
> > *To:* Fernando A. Lagos B.
> > *Cc:* full-disclosure@...ts.grok.org.uk
> > *Subject:* Re: [Full-disclosure] Full Path Disclosure in most wordpress'
> > plugins [?]
> >
> >
> >
> > Hello,
> >
> > this kind of "vulnerabilities" exists whenever a PHP scripts issue a
> > fatal error on a poorly configured server. PHP should log errors in a
> > local file and not on the client screen. With this configuration, you
> > will not see a full path disclosure in each uncatched PHP exception.
> > IMHO the security weakness is on the php.ini and not on the web
> application.
> >
> > cheers,
> >
> > majinboo
> >
> > 2009/9/28 Fernando A. Lagos B. <fernando@...ial.org
> > <mailto:fernando@...ial.org>>
> >
> > Exists an call to add_action() without validate with function_exists().
> > When I run the php script directly, I get the full path of wp
> installation.
> >
> > Example:
> > [+] http://www.marco2010.cl/wp-content/plugins/akismet/akismet.php
> > [+] http://www.marco2010.cl/wp-content/plugins/hello.php
> >
> >
> > Is a bug? Is a feature?
> >
> > More details posted in my blog:
> >
> http://blog.zerial.org/seguridad/vulnerabilidad-en-la-mayoria-de-los-plugins-para-wordpress/
> > (spanish)
> >
> >
> > cheers.
>
>
>
>
>
> - --
> Fernando A. Lagos Berardi - Zerial
> Desarrollador y Programador Web
> Seguridad Informatica
> Linux User #382319
> Blog: http://blog.zerial.org
> Skype: erzerial
> Jabber: zerial@...beres.org
> GTalk && MSN: fernando@...ial.org
>
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