Tinyauth is an authentication and authorization server. Prior to version 5.0.5, all three OAuth service implementations (GenericOAuthService, GithubOAuthService, GoogleOAuthService) store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider concurrently, a race condition between VerifyCode() and Userinfo() causes one user to receive a session with the other user's identity.
This issue has been patched in version 5.0.5.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Tinyauth Tinyauth
cpe:2.3:a:tinyauth:tinyauth:*:*:*:*:*:*:*:*
|
— |
5.0.5
|
References 3
https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd394…
security-advisories@github.com
https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5
security-advisories@github.com
https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92
security-advisories@github.com