7.4 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): High (H)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): High (H)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): None (N)
Activity log
- Created & dismissed (max. allowed matches exceeded) suggestion
Coder vulnerable to OIDC account takeover via email-based user matching and email_verified bypass
Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, two flaws in Coder's OIDC login chained into account takeover. Email-based user matching fell back to linking by email without checking for an existing link to a different IdP subject and the `email_verified` claim was only enforced when present as a boolean `false` so an absent or non-boolean claim was treated as verified. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 restricts the email fallback to first-time and legacy linking and defaults `email_verified` to false when the claim is absent or of an unexpected type. As a workaround, configure the OIDC provider to disallow self-registration or to require email verification before issuing tokens.
References
-
https://github.com/coder/coder/security/advisories/GHSA-9r87-mvcw-x35f x_refsource_CONFIRM
-
https://github.com/coder/coder/pull/25712 x_refsource_MISC
-
https://github.com/coder/coder/pull/25713 x_refsource_MISC
-
https://github.com/coder/coder/releases/tag/v2.29.17 x_refsource_MISC
-
https://github.com/coder/coder/releases/tag/v2.32.7 x_refsource_MISC
-
https://github.com/coder/coder/releases/tag/v2.33.8 x_refsource_MISC
-
https://github.com/coder/coder/releases/tag/v2.34.2 x_refsource_MISC
Affected products
- ==>= 2.34.0, < 2.34.2
- ==< 2.29.17
- ==>= 2.30.0, < 2.32.7
- ==>= 2.33.0, < 2.33.8