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Vulnerability · Published Jun 6, 2023 · Assigned by GitHub_M

CVE-2023-32682Improper checks for deactivated users during login in synapse

Medium 5.4

In plain English

A medium-severity improper authentication in synapse from matrix-org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20synapse1.85.1-r0ALPINE-CVE-2023-32682
Alpine:v3.21synapse1.85.1-r0ALPINE-CVE-2023-32682
Alpine:v3.22synapse1.85.1-r0ALPINE-CVE-2023-32682
Alpine:v3.23synapse1.85.1-r0ALPINE-CVE-2023-32682
Alpine:v3.24synapse1.85.1-r0ALPINE-CVE-2023-32682
Debian:14matrix-synapse1.90.0-1DEBIAN-CVE-2023-32682
PyPImatrix-synapse1.85.0GHSA-26c5-ppr8-f33p
PyPImatrix-synapse1.85.0PYSEC-2023-84
Ubuntu:22.04:LTSmatrix-synapseno fix listedUBUNTU-CVE-2023-32682

Affected products (as reported)

VendorProductVersions
matrix-org synapse < 1.85.0

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References