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WS-2023-0187
Good to know:
Date: June 22, 2023
There are three weaknesses in Brave's FIDO U2F implementation. At first, u2f.register() can be executed from cross-origin subframe by invoking U2F.postMessage directly Second issue - FIDO related modals show the name of top frame origin (but not caller subframe) Third issue - The version parameter sent from the above postMessage is embedded in an evaluateJavaScript without escape The combination of these weaknesses allows cross-domain subframe to inject any JavaScript code to the top frame through fake U2F registration process.
Language: Swift
Severity Score
Severity Score
Weakness Type (CWE)
Cross-Site Scripting (XSS)
CWE-79Top Fix
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | REQUIRED |
| Scope (S): | CHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | LOW |
| Availability (A): | NONE |