Description
Basecamp's Google Sign-In adds Google sign-in to Rails applications. Prior to version 1.3.0, it is possible to craft a malformed URL that passes the "same origin" check, resulting in the user being redirected to another origin. Rails applications configured to store the flash information in a session cookie may be vulnerable, if this can be chained with an attack that allows injection of arbitrary data into the session cookie. This issue has been patched in version 1.3.0. If upgrading is not possible at this time, a way to mitigate the chained attack can be done by explicitly setting SameSite=Lax or SameSite=Strict on the application session cookie.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected products
- basecamp / google_sign_in< 1.3.0 – < 1.3.0
References
- VENDOR_ADVISORYhttps://github.com/basecamp/google_sign_in/security/advisories/GHSA-7pwc-wh6m-44q3
- PATCHhttps://github.com/basecamp/google_sign_in/pull/73
- PATCHhttps://github.com/basecamp/google_sign_in/commit/85903651201257d4f14b97d4582e6d968ac32f15
- PATCHhttps://github.com/basecamp/google_sign_in/releases/tag/v1.3.0