PT-2017-10697 · Zulip · Zulip Server

Ibram Marzouk · Published 2017-06-02 · Updated 2019-10-03 · CVE-2017-0896

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Zulip Server versions 1.5.1 and below

Description The issue arises from an error in the implementation of the invite by admins only setting in the Zulip group chat application server. This error allows an authenticated user to invite other users to join a Zulip organization, even if the organization is configured to prevent this action.

Recommendations For Zulip Server versions 1.5.1 and below, as a temporary workaround, consider disabling the invite functionality until a patch is available. Restrict access to the organization's settings to minimize the risk of exploitation. Avoid using the invite by admins only setting in configurations where it is intended to restrict invitations.

Fix

Missing Authorization

Improper Authorization

Weakness Enumeration

CWE-862

CWE-285

Related Identifiers

CVE-2017-0896

Affected Products

Zulip Server

References · 5

• https://github.com/zulip/zulip/commit/1f48fa27672170bba3b9a97384905bb04c18761b · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2017-0896 · Security Note
• https://osv.dev/vulnerability/CVE-2017-0896 · Vendor Advisory
• https://hackerone.com/reports/224210 · Note
• https://groups.google.com/forum/#%21msg/zulip-announce/sUYeJv-fFmg/2TU2TLmNAwAJ · Note