CVE-2023-32682
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| sid | Fixed | 1.90.0-1 |
| forky | Fixed | 1.90.0-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | matrix-synapse | <1.85.0 | 1.85.0 |
References
- https://github.com/matrix-org/synapse/security/advisories/GHSA-26c5-ppr8-f33p
- https://nvd.nist.gov/vuln/detail/CVE-2023-32682
- https://github.com/matrix-org/synapse/issues/12274
- https://github.com/matrix-org/synapse/pull/15624
- https://github.com/matrix-org/synapse/pull/15634
- https://github.com/matrix-org/synapse
- https://github.com/matrix-org/synapse/releases/tag/v1.85.0
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-84.yaml
- 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://security-tracker.debian.org/tracker/CVE-2023-32682
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.