CVE-2023-40703: Denial of Service via specially crafted block fields in Mattermost Boards
First published: Mon Nov 27 2023(Updated: )
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string.
Credit: responsibledisclosure@mattermost.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| go/github.com/mattermost/mattermost-server/v6 | <7.8.13 | 7.8.13 |
| go/github.com/mattermost/mattermost/server/v8 | <8.1.4 | 8.1.4 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.0.0<9.0.2 | 9.0.2 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.1.0<9.1.1 | 9.1.1 |
| Mattermost | <=7.8.12 | |
| Mattermost | >=8.0.0<=8.1.3 | |
| Mattermost | >=9.0.0<=9.0.1 | |
| Mattermost | =9.1.0 |
Remedy
Update Mattermost Server to versions 9.1.1, 9.0.2, 7.8.13, 8.1.4 or higher.
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Reference Links
Frequently Asked Questions
What is CVE-2023-40703?
CVE-2023-40703 is a vulnerability in Mattermost Boards that allows an attacker to consume excessive resources, possibly leading to a Denial of Service, by patching the field of a block using a specially crafted string.
How does CVE-2023-40703 affect Mattermost?
CVE-2023-40703 affects Mattermost versions 7.8.13 up to 9.1.1.
What is the severity of CVE-2023-40703?
CVE-2023-40703 has a severity rating of 4.3, which is considered medium.
How can I fix CVE-2023-40703?
To fix CVE-2023-40703, it is recommended to update to Mattermost versions 7.8.14, 8.1.5, 9.0.3, or 9.1.2.
Where can I find more information about CVE-2023-40703?
You can find more information about CVE-2023-40703 on the Mattermost website, NIST vulnerability database, and GitHub advisory.
- collector/github-advisory-latest
- alias/GHSA-c37r-v8jx-7cv2
- alias/CVE-2023-40703
- collector/github-advisory
- agent/type
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- agent/first-publish-date
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
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- agent/last-modified-date
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- agent/references
- agent/description
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- agent/source
- agent/tags
- collector/nvd-cve
- agent/software-canonical-lookup-request
- collector/nvd-api
- package-manager/go
- vendor/mattermost
- canonical/mattermost
- version/mattermost/7.8.12
- version/mattermost/8.0.0
- version/mattermost/8.1.3
- version/mattermost/9.0.0
- version/mattermost/9.0.1
- version/mattermost/9.1.0