CVE-2017-18889: Input Validation
Published Jun 19, 2020
·Updated
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. An attacker could create fictive system-message posts via webhooks and slash commands, in the v3 or v4 REST API.
Affected Software
6 affected components
Mattermost Mattermost Server<4.1.2
Mattermost Mattermost Server>=4.2.0<4.2.1
Mattermost Mattermost Server=4.3.0-rc1
Mattermost Mattermost Server=4.3.0-rc2
Mattermost Mattermost Server=4.3.0-rc3
Mattermost Mattermost Server=4.3.0-rc4
Event History
Jun 19, 2020
CVE Published
via MITRE·06:08 PM
Data Sourced
via MITRE·06:08 PM
Description
Frequently Asked Questions
1
What is the severity of CVE-2017-18889?
CVE-2017-18889 has a medium severity rating, as it allows an attacker to post fictive system messages.
2
How do I fix CVE-2017-18889?
To mitigate CVE-2017-18889, update Mattermost Server to version 4.3.0 or higher.
3
What systems are affected by CVE-2017-18889?
CVE-2017-18889 affects Mattermost Server versions below 4.3.0, 4.2.1, and 4.1.2.
4
What types of attacks are possible with CVE-2017-18889?
With CVE-2017-18889, attackers can exploit webhooks and slash commands to create misleading system message posts.
5
Are there any workarounds for CVE-2017-18889?
There are no official workarounds for CVE-2017-18889; updating to a patched version is the only solution.