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Explainer None Specification https://github.com/w3c/webappsec-cspee/pull/28/files Summary Removes a special treatment for same-origin iframes from CSP Embedded Enforcement. This aligns the behavior of enforcing CSP Embedded Enforcement for cross-origin iframes and same-origin iframes. Blink component Blink>SecurityFeature>ContentSecurityPolicy <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ESecurityFeature%3EContentSecurityPolicy> Motivation The same-origin blanket enforcement logic specific to same-origin iframes exposes a new way to block certain resources from loading in the iframe. This allowed an attack which was not possible before (example <https://github.com/google/google-ctf/tree/master/2023/quals/web-biohazard/solution#reviving-xss-auditor-primitive>). Additionally, this caused a bug <https://github.com/w3c/webappsec-cspee/issues/26> where CSP nonce value enforced by CSPEE from a top frame had to exactly match nonce value served in grand-child frame, if the top frame and child frame are cross-origin, but child frame and grand-child frame are same-origin. Given this part of blanket enforcement is rarely used (~0.000017% <https://chromestatus.com/metrics/feature/timeline/popularity/4599>), let's remove this logic. Initial public proposal None TAG review None TAG review status Not applicable Risks Interoperability and Compatibility None Gecko: Positive <https://github.com/mozilla/standards-positions/issues/878> WebKit: No signal <https://github.com/WebKit/standards-positions/issues/251> Web developers: No signals Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Debuggability None Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> ? Yes <https://github.com/web-platform-tests/wpt/pull/41926> Flag name on chrome://flags None Finch feature name None Non-finch justification None Requires code in //chrome? False Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=1263288 Estimated milestones M120 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5098158594195456 -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/a008e0f7-d1f1-4451-8d2a-6e0757913470n%40chromium.org.
