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

2023-06-0618:20:14

CWE-287

GitHub_M

www.cve.org

cve-2023-32682

vulnerability

synapse

json web tokens

python

twisted framework

deactivated users

single sign-on

sso

ldap

upgrade

5.4 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

5.6 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

48.0%

JSON

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.

CNA Affected

[
  {
    "vendor": "matrix-org",
    "product": "synapse",
    "versions": [
      {
        "version": "< 1.85.0",
        "status": "affected"
      }
    ]
  }
]