CVE-2017-0881

Description

An error in the implementation of an autosubscribe feature in the check_stream_exists route of the Zulip group chat application server before 1.4.3 allowed an authenticated user to subscribe to a private stream that should have required an invitation from an existing member to join. The issue affects all previously released versions of the Zulip server.

Weakness classification

• CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
• CWE-863: Incorrect Authorization

Primary references

• support@hackerone.com — Third Party Advisory, Vendor Advisory
• support@hackerone.com — Patch, Third Party Advisory
• support@hackerone.com — Patch, Release Notes, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Release Notes, Third Party Advisory