Vulnerability Details : CVE-2021-43791

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.
Published 2021-12-02 01:15:07
Updated 2021-12-03 18:09:07
Source GitHub, Inc.
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-43791

EPSS FAQ
0.07%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 32 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-43791

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
 MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N
10.0
2.9
 NIST
5.3
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.9
1.4
 NIST
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.9
2.5
 GitHub, Inc.

CWE ids for CVE-2021-43791

  • According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization."
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-43791

Products affected by CVE-2021-43791

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