CVE-2024-25618 Information

Description

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.

Reference

https://github.com/mastodon/mastodon/security/advisories/GHSA-vm39-j3vx-pch3 https://github.com/mastodon/mastodon/commit/b31af34c9716338e4a32a62cc812d1ca59e88d15