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Re: Magic quotes? Should I still be cautious?

From Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de>
Newsgroups comp.lang.php
Subject Re: Magic quotes? Should I still be cautious?
Date 2012-01-09 00:21 +0100
Organization albasani.net
Message-ID <jed8dl$f85$1@news.albasani.net> (permalink)
References (8 earlier) <je7v4i$qce$1@dont-email.me> <je9tlt$dlk$1@news.albasani.net> <jeabe9$51k$1@dont-email.me> <jeaqjk$2mf$1@news.albasani.net> <jearp0$14r$1@dont-email.me>

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Jerry Stuckle schrieb:

> That's your first mistake.  Cookies are completely unrelated to sessions 
> - except for the session id in PHP.  So there is no need for an extra 
> setcookie() call - except when you have screwed up logic.

Maybe there is some misunderstanding here.

> There is no way to ensure the value isn't set via a cookie or GET 
> request.  A hacker can easily send it any way he wants.  This is a very 
> basic security concept.

Yes, that's what I'm saying: A hacker can send it any way he wants.

> Detection is always the first step in prevention, as 
> anyone familiar with security understands.  You cannot prevent something 
> you cannot detect.

Assume a variable is supposed to be sent via POST. Now there are the 
good guys and the bad guys. The good guys will, by definition, always 
send that variable via POST as intended. For /them/, we don't need any 
checks and we might even allow them to send it via GET, because we know 
they're the good guys. The bad guys /can/ send it via POST as well. 
Thus, your website must be able to withstand an attack coming via the 
"right" method. But if your website can withstand such an attack, it can 
automatically also withstand an attack via the "wrong" method. So you're 
safe, without needing to check for the method.

To accept a "delete=all", there must be a session, a properly logged-in 
user etc. and that command must be accompanied by a one-time token your 
website generates whenever the delete form is displayed. If there is no 
security flaw in this, then it is either impossible for the command to 
come via GET instead of POST without failing at least one of the other 
conditions or it *is* valid (I can tell my Firefox to change POSTs to 
GETs and vice versa). And if there /is/ a security flaw in this, then it 
is certainly something which is not related to the input method, but 
must be some "deeper" problem.

In other words: If I cannot prevent an attack *without* checking which 
way the variable came, then my security is no good. But if I can prevent 
an attack without checking this, then why should I bother checking?

Greetings,
Thomas

-- 
Ce n'est pas parce qu'ils sont nombreux à avoir tort qu'ils ont raison!
(Coluche)

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Thread

Magic quotes? Should I still be cautious? Michael Joel <no@please.com> - 2011-12-29 15:55 -0500
  Re: Magic quotes? Should I still be cautious? Michael Fesser <netizen@gmx.de> - 2011-12-29 22:04 +0100
    Re: Magic quotes? Should I still be cautious? Michael Joel <no@please.com> - 2011-12-29 16:53 -0500
      Re: Magic quotes? Should I still be cautious? Michael Joel <no@please.com> - 2011-12-29 17:08 -0500
    Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2011-12-29 23:22 +0100
  Re: Magic quotes? Should I still be cautious? "Peter H. Coffin" <hellsop@ninehells.com> - 2011-12-29 17:53 -0600
    Re: Magic quotes? Should I still be cautious? Michael Joel <no@please.com> - 2011-12-29 23:32 -0500
      Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2011-12-30 12:38 +0100
        Re: Magic quotes? Should I still be cautious? Michael Joel <no@please.com> - 2011-12-30 09:52 -0500
          Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2012-01-02 15:02 +0100
      Re: Magic quotes? Should I still be cautious? Michael Fesser <netizen@gmx.de> - 2011-12-30 13:18 +0100
  Re: Magic quotes? Should I still be cautious? "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2011-12-30 10:26 +0100
  Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2011-12-30 14:42 +0100
    Re: Magic quotes? Should I still be cautious? Michael Joel <no@please.com> - 2011-12-30 09:52 -0500
  Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-04 15:55 +0100
    Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2012-01-05 14:08 +0100
      Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-05 14:22 +0100
        Re: Magic quotes? Should I still be cautious? The Natural Philosopher <tnp@invalid.invalid> - 2012-01-05 13:36 +0000
          Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2012-01-05 15:20 +0100
            Re: Magic quotes? Should I still be cautious? The Natural Philosopher <tnp@invalid.invalid> - 2012-01-05 15:49 +0000
        Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2012-01-05 14:39 +0100
      Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 00:28 +0100
        Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-05 19:36 -0500
          Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2012-01-06 11:16 +0100
          Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2012-01-06 12:05 +0100
            Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-06 08:32 -0500
              Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 18:18 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-06 13:04 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-08 20:48 +0100
              Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2012-01-06 20:14 +0100
                Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 20:24 +0100
                Re: Magic quotes? Should I still be cautious? The Natural Philosopher <tnp@invalid.invalid> - 2012-01-06 19:34 +0000
                Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 21:11 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-06 18:12 -0500
                Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2012-01-07 17:59 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-07 15:54 -0500
                Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2012-01-08 02:13 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-07 20:33 -0500
                Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2012-01-09 00:21 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-08 19:05 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-08 20:52 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-08 15:59 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-11 11:00 +0100
                Re: Magic quotes? Should I still be cautious? The Natural Philosopher <tnp@invalid.invalid> - 2012-01-11 11:53 +0000
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-11 08:45 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-11 15:43 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-11 08:44 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-11 15:47 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-11 09:51 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-11 18:09 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-11 14:01 -0500
                Re: Magic quotes? Should I still be cautious? Arno Welzel <usenet@arnowelzel.de> - 2012-01-12 08:58 +0100
          Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 17:41 +0100
            Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-06 13:05 -0500
        Re: Magic quotes? Should I still be cautious? Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2012-01-06 11:07 +0100
          Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 18:05 +0100
            Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-06 13:07 -0500
              Re: Magic quotes? Should I still be cautious? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-01-06 19:45 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-06 18:09 -0500
                Re: Magic quotes? Should I still be cautious? Thomas Mlynarczyk <thomas@mlynarczyk-webdesign.de> - 2012-01-07 18:08 +0100
                Re: Magic quotes? Should I still be cautious? Jerry Stuckle <jstucklex@attglobal.net> - 2012-01-07 15:59 -0500

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