CVE-2023-32682: Improper checks for deactivated users during login in synapse
First published: Tue Jun 06 2023(Updated: )
### Impact It may be possible for a deactivated user to login when using uncommon configurations. This only applies if any of the following are true: * [JSON Web Tokens are enabled for login](https://matrix-org.github.io/synapse/latest/jwt.html) via the `jwt_config.enabled` configuration setting * The [local password database is enabled](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#password_config) via the `password_config.enabled` and `password_config.localdb_enabled` configuration settings *and* a user's password is [updated via an admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#create-or-modify-account) 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. ### Patches * If using JSON Web Token logins: #15624 * For other users: #15634 ### Workarounds If not using JSON Web Tokens, ensure that deactivated users do not have a password set. This list of users can be queried from PostgreSQL: ```sql SELECT name FROM users WHERE password_hash IS NOT NULL AND deactivated = 1; ```
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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Reference Links
- https://github.com/matrix-org/synapse/pull/15624
- https://github.com/matrix-org/synapse/pull/15634
- https://github.com/matrix-org/synapse/security/advisories/GHSA-26c5-ppr8-f33p
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X6DH5A5YEB5LRIPP32OUW25FCGZFCZU2/
- https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#create-or-modify-account
- https://matrix-org.github.io/synapse/latest/jwt.html
- https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#password_config
- https://github.com/matrix-org/synapse/issues/12274
- https://github.com/matrix-org/synapse/releases/tag/v1.85.0
- https://nvd.nist.gov/vuln/detail/CVE-2023-32682
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-84.yaml
- https://github.com/advisories/GHSA-26c5-ppr8-f33p (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X6DH5A5YEB5LRIPP32OUW25FCGZFCZU2
Frequently Asked Questions
What is CVE-2023-32682?
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.
What is the severity of CVE-2023-32682?
CVE-2023-32682 has a severity score of 5.4, which is considered medium.
How does CVE-2023-32682 affect Synapse?
CVE-2023-32682 affects Synapse versions up to and excluding 1.85.0.
How can this vulnerability be exploited?
This vulnerability can be exploited when JSON Web Tokens are enabled for login via the `jwt_` configuration option and uncommon configurations are used.
Is there a fix for CVE-2023-32682?
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).
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