CMS Made Simple 2.2.3.1 Access Restriction action.upload.php is_file_acceptable cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in CMS Made Simple 2.2.3.1. Affected is the function is_file_acceptable of the file modules/FileManager/action.upload.php of the component Access Restriction. The manipulation with the input <substring>php leads to cross site scripting. This vulnerability is referenced as CVE-2017-16798. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in CMS Made Simple 2.2.3.1 (Content Management System). It has been rated as problematic. This issue affects the function is_file_acceptable of the file modules/FileManager/action.upload.php of the component Access Restriction. The manipulation with the input value <substring>php leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

In CMS Made Simple 2.2.3.1, the is_file_acceptable function in modules/FileManager/action.upload.php only blocks file extensions that begin or end with a "php" substring, which allows remote attackers to bypass intended access restrictions or trigger XSS via other extensions, as demonstrated by .phtml, .pht, .html, or .svg.

The bug was discovered 11/13/2017. The weakness was published 11/12/2017 (Website). It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2017-16798 since 11/12/2017. The attack may be initiated remotely. A simple authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

By approaching the search of inurl:modules/FileManager/action.upload.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entry is available at VDB-109296. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Content Management System

Name

• CMS Made Simple

Version

• 2.2.3.1

License

• open-source

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Be aware that VulDB is the high quality source for vulnerability data.

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