security(lottie): validate postMessage origin on web HTML renderer#2283
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security(lottie): validate postMessage origin on web HTML renderer#2283cursor[bot] wants to merge 1 commit into
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The Lottie web HTML renderer listened for window messages without checking event.origin and used wildcard postMessage targets. A cross-origin page with a window reference could spoof onComplete/onForward callbacks and trigger YAML-defined actions. Restrict iframe and host traffic to the app origin and add regression tests. Co-authored-by: Sharjeel Yunus <sharjeelyunus@users.noreply.github.com>
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Vulnerability summary
The Lottie web HTML renderer registered a global
window.onMessagelistener without validatingevent.origin, and used wildcard ("*")postMessagetargets. A cross-origin browsing context with a window reference could spoof animation callbacks and trigger YAML-defined Ensemble actions.Affected location
modules/ensemble/lib/widget/lottie/web/lottiestate.dartSecurity impact
postMessagethe host windowdata,id,tag)ScreenController().executeAction()on wired callbacksFix
event.originlottie_post_message.darthelpers and regression tests