PT-2021-18750 · Unknown · Zulip Server

Published 2021-04-14 · Updated 2022-07-12 · CVE-2021-30479

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Zulip Server versions prior to 3.4

Description An issue was discovered in the implementation of the all public streams API feature, resulting in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.

Recommendations For versions prior to 3.4, update to version 3.4 or later to resolve the issue. As a temporary workaround, consider restricting access to the all public streams API feature to minimize the risk of exploitation.

Fix

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2021-30479

Affected Products

Zulip Server

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2021-30479 · Security Note
• https://osv.dev/vulnerability/CVE-2021-30479 · Vendor Advisory
• https://blog.zulip.com/2021/04/14/zulip-server-3-4 · Vendor Advisory
• https://t.me/cvenotify/13238 · Telegram Post