9.8
CRITICAL
CVE-2022-21706
Zulip Multi-Organization Access Control Bypass Vulnerability
Description

Zulip is an open-source team collaboration tool with topic-based threading. 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 on 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 issue has been patched in release 4.10. There are no known workarounds for this issue. ### Patches _Has the problem been patched? What versions should users upgrade to?_ ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ ### References _Are there any links users can visit to find out more?_ ### For more information If you have any questions or comments about this advisory, you can discuss them on the [developer community Zulip server](https://zulip.com/developer-community/), or email the [Zulip security team](mailto:[email protected]).

INFO

Published Date :

Feb. 26, 2022, 12:15 a.m.

Last Modified :

July 24, 2023, 1:47 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2022-21706 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2022-21706 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zulip zulip_server
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2022-21706.

URL Resource
https://blog.zulip.com/2022/02/25/zulip-cloud-invitation-vulnerability/ Vendor Advisory
https://blog.zulip.com/2022/02/25/zulip-server-4-10-security-release/#cve-2022-21706 Vendor Advisory
https://github.com/zulip/zulip/commit/88917019f03860609114082cdc0f31a561503f9e Patch Third Party Advisory
https://github.com/zulip/zulip/security/advisories/GHSA-6xmj-2wcm-p2jc Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

test 反向辣鸡数据投放 CVE-2022-23305 工具 利用 教程 Exploit POC

cve-2020-

Updated: 2 years ago
5 stars 2 fork 2 watcher
Born at : Jan. 21, 2022, 5:07 a.m. This repo has been linked 2633 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2022-21706 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2022-21706 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Jul. 24, 2023

    Action Type Old Value New Value
    Removed CWE NIST CWE-863
    Added CWE NIST NVD-CWE-Other
  • Initial Analysis by [email protected]

    Mar. 08, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://blog.zulip.com/2022/02/25/zulip-cloud-invitation-vulnerability/ No Types Assigned https://blog.zulip.com/2022/02/25/zulip-cloud-invitation-vulnerability/ Vendor Advisory
    Changed Reference Type https://blog.zulip.com/2022/02/25/zulip-server-4-10-security-release/#cve-2022-21706 No Types Assigned https://blog.zulip.com/2022/02/25/zulip-server-4-10-security-release/#cve-2022-21706 Vendor Advisory
    Changed Reference Type https://github.com/zulip/zulip/commit/88917019f03860609114082cdc0f31a561503f9e No Types Assigned https://github.com/zulip/zulip/commit/88917019f03860609114082cdc0f31a561503f9e Patch, Third Party Advisory
    Changed Reference Type https://github.com/zulip/zulip/security/advisories/GHSA-6xmj-2wcm-p2jc No Types Assigned https://github.com/zulip/zulip/security/advisories/GHSA-6xmj-2wcm-p2jc Third Party Advisory
    Added CWE NIST CWE-863
    Added CPE Configuration OR *cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 4.10.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2022-21706 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.56 }} 0.05%

score

0.78190

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability