Adobe Flash Player ShimContentFactory.retrieveResolvers Memory Corruption Vulnerability

How it was found

I. Summary Adobe Flash Player is prone to a vulnerability which leads to memory corruption because of improper validation of ShimContentFactory.retrieveResolvers().

II. Description Normally, retrieveResolvers() should validates its parameter and returns error in AS3 level if anything goes wrong. If retrieveResolvers() function is invoked directly with invalid parameter, some inner class instance will be absent, which will cause a memory crash.

III. Impact Memory Corruption

IV. Affected Adobe Flash Player 21.0.0.242.

V. Credit Wen Guanxing from Pangu LAB is credited for this vulnerability.

It has been assigned by Adobe as CVE-2016-4151. https://helpx.adobe.com/security/products/flash-player/apsb16-18.html