CVE-2023-32682

Improper checks for deactivated users during login in synapse

Description

Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. In affected versions it may be possible for a deactivated user to login when using uncommon configurations. This only applies if any of the following are true: 1. JSON Web Tokens are enabled for login via the `jwt_config.enabled` configuration setting. 2. The local password database is enabled via the `password_config.enabled` and `password_config.localdb_enabled` configuration settings *and* a user's password is updated via an admin API after a user is deactivated. Note that the local password database is enabled by default, but it is uncommon to set a user's password after they've been deactivated. Installations that are configured to only allow login via Single Sign-On (SSO) via CAS, SAML or OpenID Connect (OIDC); or via an external password provider (e.g. LDAP) are not affected. If not using JSON Web Tokens, ensure that deactivated users do not have a password set. This issue has been addressed in version 1.85.0. Users are advised to upgrade.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.52%
Vendor Advisory github.com
Affected: matrix-org synapse
Published at:
Updated at:

References

Link Tags
https://github.com/matrix-org/synapse/security/advisories/GHSA-26c5-ppr8-f33p patch vendor advisory mitigation
https://github.com/matrix-org/synapse/pull/15624 patch
https://github.com/matrix-org/synapse/pull/15634 patch
https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#create-or-modify-account product
https://matrix-org.github.io/synapse/latest/jwt.html product
https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#password_config product
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X6DH5A5YEB5LRIPP32OUW25FCGZFCZU2/

Frequently Asked Questions

What is the severity of CVE-2023-32682?
CVE-2023-32682 has been scored as a medium severity vulnerability.
How to fix CVE-2023-32682?
To fix CVE-2023-32682, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-32682 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-32682 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-32682?
CVE-2023-32682 affects matrix-org synapse.
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