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GHSA-7cc2-r658-7xpf
No affected components available
Summary
A vulnerability in Coder's OIDC authentication could allow an attacker to bypass the CODER_OIDC_EMAIL_DOMAIN verification and create an account with an email not in the allowlist. Deployments are only affected if the OIDC provider allows users to create accounts on the provider (such as public providers like google.com).
Details
During OIDC registration, the user's email was improperly validated against the allowed CODER_OIDC_EMAIL_DOMAINs. This could allow a user with a domain that only partially matched an allowed domain to successfully login or register (e.g. user@exploitcorp.com would match the allowed domain corp.com).
An attacker could register a domain name that exploited this vulnerability and register on a Coder instance with a public OIDC provider.
Impact
Coder instances with OIDC enabled and protected by the CODER_OIDC_EMAIL_DOMAIN configuration.
Coder instances using a private OIDC provider are not affected, as arbitrary users cannot register through a private OIDC provider without first having an account on the provider.
Public OIDC providers (such as google.com without permitted domains set on the OAuth2 App) are impacted.
GitHub authentication and external authentication are not impacted.
Was my deployment impacted?
To check if your deployment was exploited:
- View the audit log on your deployment for unexpected registered users (using the
action:registerfilter) - Check the users list for unexpected users
- Users created via this exploit will have a domain that ends with one of the allowed domains but doesn’t fully match (e.g.
@exploitcorp.cominstead of@corp.com)
- Users created via this exploit will have a domain that ends with one of the allowed domains but doesn’t fully match (e.g.
Patched Versions
This vulnerability is remedied in
- v2.8.4
- v2.7.3
- v2.6.1
All versions prior to these patches are affected by the vulnerability. It is recommended that customers upgrade their deployments as soon as possible if they are utilizing OIDC authentication with the CODER_OIDC_EMAIL_DOMAIN setting.
Thanks
- https://github.com/arcz
- https://www.trailofbits.com
References
https://github.com/coder/coder/security/advisories/GHSA-7cc2-r658-7xpf https://github.com/coder/coder/commit/4439a920e454a82565e445e4376c669e3b89591c https://nvd.nist.gov/vuln/detail/CVE-2024-27918
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 low impact on the confidentiality of the information. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
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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