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Multi-use invitations can grant access to other organizations

High
alexmv published GHSA-6xmj-2wcm-p2jc Feb 25, 2022

Package

Zulip Server (Application)

Affected versions

> 2.0.0, < 4.10

Patched versions

4.10

Description

Impact

Zulip Server version 2.0.0 and above are vulnerable to insufficient access control with multi-use invitations. A Zulip Server deployment which hosts multiple organizations is vulnerable to an attack where an invitation created in one organization (potentially as a role with elevated permissions) can be used to join any other organization. This bypasses any restrictions on required domains of users' email addresses, may be used to gain access to organizations which are only accessible by invitation, and may be used to gain access with elevated privileges.

This is a different vulnerability than CVE-2017-0910, which only affected single-use invitation links.

Patches

88917019f03860609114082cdc0f31a561503f9e closed the vulnerability.

References

For more information

If you have any questions or comments about this advisory, you can discuss them on the developer community Zulip server, or email the Zulip security team.

Severity

High
7.2
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVE ID

CVE-2022-21706

Weaknesses