First published: Tue Jun 06 2023(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.
Credit: security-advisories@github.com security-advisories@github.com
Affected Software | Affected Version | How to fix |
---|---|---|
Matrix Synapse | <1.85.0 | |
pip/matrix-synapse | <1.85.0 | 1.85.0 |
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CVE-2023-32682 is a vulnerability in Synapse, a Matrix protocol homeserver written in Python, that allows a deactivated user to login when using uncommon configurations.
CVE-2023-32682 has a severity score of 5.4, which is considered medium.
CVE-2023-32682 affects Synapse versions up to and excluding 1.85.0.
This vulnerability can be exploited when JSON Web Tokens are enabled for login via the `jwt_` configuration option and uncommon configurations are used.
Yes, the fix for CVE-2023-32682 is available in the following pull requests: [PR 15624](https://github.com/matrix-org/synapse/pull/15624) and [PR 15634](https://github.com/matrix-org/synapse/pull/15634).