CVE-2023-28623: medium-severity vulnerability in zulip
Unauthorized user can register an account in specific configurations in Zulip
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.5%
Zulip is an open-source team collaboration tool with unique topic-based threading. In the event that 1: `ZulipLDAPAuthBackend` and an external authentication backend (any aside of `ZulipLDAPAuthBackend` and `EmailAuthBackend`) are the only ones enabled in `AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py` and 2: The organization permissions don't require invitations to join. An attacker can create a new account in the organization with an arbitrary email address in their control that's not in the organization's LDAP directory. The impact is limited to installations which have this specific combination of authentication backends as described above in addition to having `Invitations are required for joining this organization` organization permission disabled. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may enable the `Invitations are required for joining this organization` organization permission to prevent this issue.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Affected products
zulip · zulipRelated CVEs — zulip
In the same product, most dangerous first.
CVE-2021-43799HIGHRabbitMQ exposes ports with weak default secrets in Zulip ServerEPSS 5.4%CVE-2021-41115MEDIUMRegular expression denial-of-service in ZulipEPSS 1.7%CVE-2022-21706HIGHMulti-use invitations can grant access to other organizations in ZulipEPSS 1.2%CVE-2022-24751MEDIUMRace condition in ZulipEPSS 1.0%CVE-2022-31134MEDIUMZulip Server public data export contains attachments that are non-publicEPSS 0.9%CVE-2022-31168MEDIUMZulip Server insufficient authorization for changing bot rolesEPSS 0.8%