Some vulnerabilities have been discovered in vtiger CRM, which can be exploited by malicious users to compromise a vulnerable system and by malicious people to conduct cross-site scripting attacks and disclose sensitive information.

1) An error exists in the file upload functionality due to the emails module not properly checking file names and extensions. This can be exploited to upload and execute arbitrary PHP code e.g. via ".phtml" files.

2) Input passed e.g. via the "lang_crm" parameter to phprint.php or the "current_language" parameter to graph.php is not properly verified in the "return_application_language()" function in include/utils/utils.php before being used to include files. This can be exploited to include arbitrary file from local resources via directory traversal sequences and URL-encoded NULL bytes.

Successful exploitation of this vulnerability requires that "magic_quotes_gpc" is disabled.

3) Input passed via the "user_name" and "user_password" parameters to index.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

4) Input passed via the "label" parameter to index.php (when "module" is set to "Settings" and "action" is set to "GetFieldInfo") is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

The vulnerabilities are confirmed in version 5.2.0. Other versions may also be affected.

Solution
Update to version 5.2.1.

Provided and/or discovered by
Giovanni "evilaliv3" Pellerano and Alessandro "jekil" Tanasi

Original Advisory
vtiger CRM:
http://wiki.vtiger.com/index.php/Vtiger521:Release_Notes

Giovanni Pellerano and Alessandro Tanasi:
http://www.ush.it/team/ush/hack-vtigercrm_520/vtigercrm_520.txt

Deep Links
Links available in Customer Area