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CVE-2021-43791— Ineffective expiration validation for invitation links in Zulip

Quick assessment

Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zulip是Zulip团队的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 存在代码问题漏洞，攻击者可利用该漏洞使用一个过期的确认密钥来完成注册，Zulip 4.8解决了这个问题，建议用户尽快升级。

CVSS 6.5 · Medium EPSS 0.64% · P48

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2021-43791

Vulnerability Information
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Vulnerability Title
Ineffective expiration validation for invitation links in Zulip
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open source group chat application that combines real-time chat with threaded conversations. In affected versions expiration dates on the confirmation objects associated with email invitations were not enforced properly in the new account registration flow. A confirmation link takes a user to the check_prereg_key_and_redirect endpoint, before getting redirected to POST to /accounts/register/. The problem was that validation was happening in the check_prereg_key_and_redirect part and not in /accounts/register/ - meaning that one could submit an expired confirmation key and be able to register. The issue is fixed in Zulip 4.8. There are no known workarounds and users are advised to upgrade as soon as possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的会话过期机制
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是Zulip团队的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 存在代码问题漏洞，攻击者可利用该漏洞使用一个过期的确认密钥来完成注册，Zulip 4.8解决了这个问题，建议用户尽快升级。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zulip zulip < 4.8 -

II. Public POCs for CVE-2021-43791

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III. Intelligence Information for CVE-2021-43791

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Patches & Fixes for CVE-2021-43791 (1)

Vendor Advisories for CVE-2021-43791 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-613

V. Comments for CVE-2021-43791

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