Mastodon is a free, open-source social network server based on ActivityPub. Mastodon allows new identities from configured authentication providers (CAS, SAML, OIDC) to attach to existing local users with the same e-mail address. This results in a possible account takeover if the authentication provider allows changing the e-mail address or multiple authentication providers are configured. When a user logs in through an external authentication provider for the first time, Mastodon checks the e-mail address passed by the provider to find an existing account. However, using the e-mail address alone means that if the authentication provider allows changing the e-mail address of an account, the Mastodon account can immediately be hijacked. All users logging in through external authentication providers are affected. The severity is medium, as it also requires the external authentication provider to misbehave. However, some well-known OIDC providers (like Microsoft Azure) make it very easy to accidentally allow unverified e-mail changes. Moreover, OpenID Connect also allows dynamic client registration. This issue has been addressed in versions 4.2.6, 4.1.14, 4.0.14, and 3.5.18. Users are advised to upgrade. There are no known workarounds for this vulnerability.
History

Wed, 18 Dec 2024 22:45:00 +0000

Type Values Removed Values Added
First Time appeared Joinmastodon
Joinmastodon mastodon
Weaknesses CWE-306
CPEs cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
Vendors & Products Joinmastodon
Joinmastodon mastodon

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2024-02-14T20:45:50.621Z

Updated: 2024-08-01T23:44:09.684Z

Reserved: 2024-02-08T22:26:33.510Z

Link: CVE-2024-25618

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2024-02-14T21:15:08.410

Modified: 2024-12-18T22:27:39.050

Link: CVE-2024-25618

cve-icon Redhat

No data.