A vulnerability was found in Zulip Server up to 1.5.1 and classified as critical. This issue affects an unknown functionality of the component Chat Application Server. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, and integrity. The summary by CVE is:

Zulip Server 1.5.1 and below suffer from an error in the implementation of the invite_by_admins_only setting in the Zulip group chat application server that allowed an authenticated user to invite other users to join a Zulip organization even if the organization was configured to prevent this.

The bug was discovered 06/01/2017. The weakness was released 06/02/2017 (Website). The advisory is shared at groups.google.com. The identification of this vulnerability is CVE-2017-0896. The attack may be initiated remotely. The successful exploitation needs a simple authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Vendor

• Zulip

Name

• Server

Version

• 1.5.0
• 1.5.1

License

• open-source

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