Mattermost Server up to 5.1.0 Channel Name authorization

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CVSS Meta Temp Score
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CTI Interest Score
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8.2$0-$5k0.00

A vulnerability was found in Mattermost Server up to 5.1.0. It has been rated as critical. This issue affects an unknown code block of the component Channel Name Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-862. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.

The weakness was shared 06/19/2020 (Website). It is possible to read the advisory at mattermost.com. The identification of this vulnerability is CVE-2018-21251 since 06/19/2020. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.1.1 or 5.2 eliminates this vulnerability.

The entries 156956, 156957, 156958 and 156960 are related to this item.

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CPE 2.3infoedit

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CVSSv3infoedit

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2infoedit

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-862
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost Server 5.1.1/5.2

Timelineinfoedit

06/19/2020 Advisory disclosed
06/19/2020 +0 days VulDB entry created
06/19/2020 +0 days CVE assigned
10/25/2020 +128 days VulDB last update

Sourcesinfoedit

Advisory: mattermost.com
Status: Not defined
Confirmation: 🔒

CVE: CVE-2018-21251 (🔒)
See also: 🔒

Entryinfoedit

Created: 06/19/2020 10:06 PM
Updated: 10/25/2020 02:27 PM
Changes: (1) advisory_confirm_url
Complete: 🔍

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