VDB-112639 · CVE-2018-6383 · Issue 162968

Monstra CMS up to 3.0.4 Extension incomplete blacklist

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.7	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Monstra CMS up to 3.0.4. Affected is an unknown function of the component Extension Handler. This manipulation causes incomplete blacklist. The identification of this vulnerability is CVE-2018-6383. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.

Detailsinfo

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. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1562.006 according to MITRE ATT&CK.

It is possible to download the exploit at packetstormsecurity.com. It is declared as proof-of-concept.

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

The vulnerability is also documented in the vulnerability database at Exploit-DB (49949). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Content Management System

Vendor

Monstra

Name

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.7

VulDB Base Score: 4.7
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.2
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Incomplete blacklist
CWE: CWE-184 / CWE-183 / CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

OpenVAS ID: 11015
OpenVAS Name: Monstra CMS <= 3.0.4 Multiple Vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/29/2018 🔍
01/29/2018 +0 days 🔍
01/29/2018 +0 days 🔍
01/29/2018 +0 days 🔍
01/30/2018 +1 days 🔍
07/22/2025 +2730 days 🔍

Sourcesinfo

Advisory: 162968
Status: Not defined

CVE: CVE-2018-6383 (🔍)
GCVE (CVE): GCVE-0-2018-6383
GCVE (VulDB): GCVE-100-112639
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 01/30/2018 08:07
Updated: 07/22/2025 14:44
Changes: 01/30/2018 08:07 (60), 12/31/2019 11:43 (1), 02/03/2023 09:29 (3), 07/03/2024 19:29 (22), 07/22/2025 14:44 (5)
Complete: 🔍
Cache ID: 216::103