bugtraq - [KIS-2016-11] IPS Community Suite <= 4.1.12.3 Autoloaded PHP Code Injection Vulnerability

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <577E7B9B.2050604@karmainsecurity.com>
Date: Thu, 07 Jul 2016 17:56:11 +0200
From: Egidio Romano <research@...mainsecurity.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org
Subject: [KIS-2016-11] IPS Community Suite <= 4.1.12.3 Autoloaded PHP Code
 Injection Vulnerability

---------------------------------------------------------------------------
IPS Community Suite <= 4.1.12.3 Autoloaded PHP Code Injection Vulnerability
---------------------------------------------------------------------------

[-] Software Link:

https://invisionpower.com/

[-] Affected Versions:

Version 4.1.12.3 and prior versions.

[-] Vulnerability Description:

The vulnerable code is located in the /applications/core/modules/front/system/content.php script:

38.	$class = 'IPS\\' . implode( '\\', explode( '_', \IPS\Request::i()->content_class ) );
39.	
40.	if ( ! class_exists( $class ) or ! in_array( 'IPS\Content', class_parents( $class ) ) )
41.	{
42.	    \IPS\Output::i()->error( 'node_error', '2S226/2', 404, '' );
43.	}

User input passed through the "content_class" request parameter is not properly sanitized before being used in a call
to the "class_exists()" function at line 40. This could be exploited by unauthenticated attackers to inject and execute
arbitrary PHP code leveraging the autoloading function defined into the /applications/cms/Application.php script:

171.	if ( mb_substr( $class, 0, 14 ) === 'IPS\cms\Fields' and is_numeric( mb_substr( $class, 14, 1 ) ) )
172.	{
173.	    $databaseId = mb_substr( $class, 14 );
174.	    eval( "namespace IPS\\cms; class Fields{$databaseId} extends Fields { public static \$customDatabaseId [...]
175.	}

Successful exploitation of this vulnerability requires the application running on PHP before version 5.4.24 or 5.5.8.

[-] Proof of Concept:

http://[host]/[ips]/index.php?app=core&module=system&controller=content&do=find&content_class=cms\Fields1{}phpinfo();/*

[-] Solution:

Update to version 4.1.13 or later.

[-] Disclosure Timeline:

[04/07/2016] - Vendor notified
[05/07/2016] - Vulnerability fixed in version 4.1.13: https://invisionpower.com/release-notes/4113-r44/
[06/07/2016] - CVE number requested
[06/07/2016] - CVE number assigned
[07/07/2016] - Public disclosure

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2016-6174 to this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2016-11