CVE-2023-32682: Improper Authentication
(updated )
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.
References
- github.com/matrix-org/synapse/pull/15624
- github.com/matrix-org/synapse/pull/15634
- github.com/matrix-org/synapse/security/advisories/GHSA-26c5-ppr8-f33p
- matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html
- matrix-org.github.io/synapse/latest/jwt.html
- matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html
- nvd.nist.gov/vuln/detail/CVE-2023-32682
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