Mattermost Server up to 5.0 Access Restriction Command permission assignment
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. |
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5.1 | $0-$5k | 0.00 |
A vulnerability classified as critical was found in Mattermost Server up to 5.0. Affected by this vulnerability is some unknown processing of the component Access Restriction. The manipulation as part of a Command leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-732. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:
An issue was discovered in Mattermost Server before 5.1. It allows attackers to bypass intended access restrictions (for group-message channel creation) via the Group message slash command.
The weakness was released 06/19/2020 (Website). It is possible to read the advisory at mattermost.com. This vulnerability is known as CVE-2018-21256 since 06/19/2020. The exploitation appears to be easy. The attack can be launched remotely. Required for exploitation is a single authentication. The technical details are unknown and an exploit is not publicly available.
Upgrading to version 5.1 eliminates this vulnerability.
Entries connected to this vulnerability are available at 156956, 156957, 156958 and 156959.
Product
Name
CPE 2.3
CPE 2.2
CVSSv3
VulDB Meta Base Score: 5.3VulDB Meta Temp Score: 5.1
VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍
NVD Base Score: 4.3
NVD Vector: 🔒
CVSSv2
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
NVD Base Score: 🔒
Exploiting
Class: Privilege escalationCWE: CWE-732
ATT&CK: Unknown
Local: No
Remote: Yes
Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Threat: 🔍Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔒
Upgrade: Mattermost Server 5.1
Timeline
06/19/2020 Advisory disclosed06/19/2020 CVE assigned
06/21/2020 VulDB entry created
10/26/2020 VulDB last update
Sources
Advisory: mattermost.comStatus: Not defined
Confirmation: 🔒
CVE: CVE-2018-21256 (🔒)
See also: 🔒
Entry
Created: 06/21/2020 09:21 AMUpdated: 10/26/2020 07:38 AM
Changes: (1) advisory_confirm_url
Complete: 🔍
Comments
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