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GHSA-g7vj-c29h-3h5m
fof/oauthfof/oauthImpact
An unauthenticated account takeover vulnerability exists in fof/oauth when the Discord OAuth provider is enabled.
Discord allows an account to use an unverified email address when its phone number has been verified. During OAuth authentication, Discord may return that email address with "verified": false.
Affected versions of fof/oauth did not validate this flag and passed the email address to Flarum core as trusted via provideTrustedEmail(). Flarum core could then match the trusted email address to an existing user, link the attacker-controlled Discord identity to that user, and authenticate the attacker as the victim.
An attacker who knows a user's email address can therefore take over the corresponding Flarum account without knowing its password or requiring any interaction from the victim. This includes administrator accounts.
Preconditions for exploitation
- Discord sign-in is enabled on the forum.
- The victim has a Flarum account with a known email address.
- The victim's email address is not already associated with a Discord account.
- The attacker creates or configures a Discord account using the victim's email address without verifying it and verifies a phone number instead.
- The attacker authenticates to the forum using that Discord account.
The issue is specific to Discord's ability to return an unverified email address through OAuth. Other bundled providers were not confirmed to be practically exploitable through the same method because they only return verified or confirmed email addresses in the relevant authentication flow.
Patched Versions
Workarounds
Administrators who cannot update immediately should disable the Discord OAuth provider in the extension settings.
Credits
Reported by @faran1512
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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