A vulnerability has been found in Monstra CMS up to 3.0.4 (Content Management System) and classified as critical. Affected by this vulnerability is some unknown functionality of the component Extension Handler. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. The CWE definition for the vulnerability is CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Monstra CMS through 3.0.4 has an incomplete "forbidden types" list that excludes .php (and similar) file extensions but not the .pht or .phar extension, which allows remote authenticated admins to execute arbitrary PHP code by uploading a file, a different vulnerability than CVE-2017-18048.

The bug was discovered 01/29/2018. The weakness was shared 01/29/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-6383 since 01/29/2018. The exploitation appears to be easy. The attack can be launched remotely. A single authentication is required for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1562.006 according to MITRE ATT&CK.

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

Productinfo

Type

• Content Management System

Vendor

• Monstra

Name

• CMS

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4

License

• open-source

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