System Role with edit access to permissions can elevate themselves to system admin

Summary

Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to restrict which roles can promote a user as system admin which allows a System Role with edit access to the permissions section of system console to update their role (e.g. member) to include the `manage_system` permission, effectively becoming a System Admin.

Timeline

1. Aug 22, 2024, 6:39 AM UTCCVE published
2. Aug 22, 2024, 1:16 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Aug 22, 2024, 1:33 PM UTCRecord last updated

Affected versions

• Mattermost Mattermost

  From 9.9.0 · through 9.9.1; From 9.5.0 · through 9.5.7; From 9.8.0 · through 9.8.2

• github.com/mattermost/mattermost/server/v8Go

  From 9.9.0 · fixed in 9.9.2

• github.com/mattermost/mattermost/server/v8Go

  From 9.5.0 · fixed in 9.5.8

• github.com/mattermost/mattermost/server/v8Go

  From 9.10.0 · fixed in 9.10.1

• github.com/mattermost/mattermost/server/v8Go

  From 9.8.0 · fixed in 9.8.3

• github.com/mattermost/mattermost-serverGo

  From 9.5.0+incompatible · fixed in 9.5.8+incompatible; From 9.8.0+incompatible · fixed in 9.8.3+incompatible; From 9.9.0+incompatible · fixed in 9.9.2+incompatible; From 9.10.0+incompatible · fixed in 9.10.1+incompatible

• github.com/mattermost/mattermost-server/v5Go

  All versions

• github.com/mattermost/mattermost-server/v6Go

  All versions

• github.com/mattermost/mattermost/server/v8Go

  All versions

References 1