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I feel like this is really a hardening fix. I see little reason to have such a dynamic styles. |
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JeanMeche
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JeanMeche
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AGENT: I have left an inline suggestion to optimize the runtime performance of getStyleDeclaration for form elements.
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Given that it's possible to generate forms with multiple JSON-based properties, adding a style-based customizations (It would suffice for them to be dynamic in any way, in any of the style forms, even if it's a string, that's enough for clobering currently) doesn't seem too strange to me personally, the first condition being somewhat normal at least in some projects I've seen. As an additional note, a quick search on GitHub suggests that applying style or ngStyle to forms isn't uncommon. The only additional requirement is that those values are dynamic, which is fairly plausible in CMSs, dashboards, or marketplaces. |
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Recover the intrinsic CSSStyleDeclaration before applying or removing style bindings. HTML named-property resolution can otherwise make a form control named or identified as style shadow HTMLFormElement.style. This lets attacker-controlled keys from style bindings reach unrelated DOM sinks such as innerHTML and outerHTML, enabling same-origin script execution during rendering. Fixes angular#70021
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Recover the intrinsic
CSSStyleDeclarationbefore applying or removing style bindings. HTML named-property resolution can otherwise make a form control named or identified as style shadowHTMLFormElement.style.This lets attacker-controlled keys from
[style],[style.property], orNgStylereach unrelated DOM sinks such asinnerHTMLandouterHTML, enabling same-origin script execution during rendering without an explicit trust bypass.Fixes #70021
More context https://issuetracker.google.com/u/1/issues/540666920