VERSION
Chrome Version: 57.0.2987.21 beta (64-bit), pepflashplayer 24.0.0.221
Operating System: Windows 7 en 64-bit

REPRODUCTION CASE

Open the poc in the attachment with chrome and observe the crash.
There is also a detailed write-up about the vulnerability in the attachment.


FOR CRASHES, PLEASE INCLUDE THE FOLLOWING ADDITIONAL INFORMATION
Type of crash: tab
Crash State: 

(12b0.74c): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.

pepflashplayer!PPP_ShutdownBroker+0x3e96d0:
000007fe`d60eded0 3981bc020000    cmp     dword ptr [rcx+2BCh],eax ds:00000000`000002bc=????????
7:101> k
Child-SP          RetAddr           Call Site
00000000`0024d690 000007fe`d60f2ad6 pepflashplayer!PPP_ShutdownBroker+0x3e96d0
00000000`0024d6f0 000007fe`d5eeda8a pepflashplayer!PPP_ShutdownBroker+0x3ee2d6
00000000`0024dea0 000007fe`d5eeeade pepflashplayer!PPP_ShutdownBroker+0x1e928a
00000000`0024df00 000007fe`d5f37339 pepflashplayer!PPP_ShutdownBroker+0x1ea2de
00000000`0024e1c0 000007fe`d5f372e6 pepflashplayer!PPP_ShutdownBroker+0x232b39
00000000`0024e1f0 000007fe`d5efd111 pepflashplayer!PPP_ShutdownBroker+0x232ae6
00000000`0024e240 000007fe`d5d1b75d pepflashplayer!PPP_ShutdownBroker+0x1f8911
00000000`0024e2d0 000007fe`d5d4127b pepflashplayer!PPP_ShutdownBroker+0x16f5d
00000000`0024e4e0 000007fe`d5d4118e pepflashplayer!PPP_ShutdownBroker+0x3ca7b
00000000`0024e530 000007fe`d5d4163c pepflashplayer!PPP_ShutdownBroker+0x3c98e
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\Program Files (x86)\Google\Chrome\Application\57.0.2987.21\chrome_child.dll - 
00000000`0024e560 000007fe`d9372574 pepflashplayer!PPP_ShutdownBroker+0x3ce3c
00000000`0024e590 000007fe`d93b80d5 chrome_child!IsSandboxedProcess+0x216f4
00000000`0024e5c0 000007fe`d938cf8a chrome_child!IsSandboxedProcess+0x67255
00000000`0024e630 000007fe`d938cabc chrome_child!IsSandboxedProcess+0x3c10a
00000000`0024e660 000007fe`d938cc06 chrome_child!IsSandboxedProcess+0x3bc3c
00000000`0024e6d0 000007fe`d935df96 chrome_child!IsSandboxedProcess+0x3bd86
00000000`0024e840 000007fe`d7d123fe chrome_child!IsSandboxedProcess+0xd116
00000000`0024e870 000007fe`d7cc718c chrome_child!ovly_debug_event+0xc9fce
00000000`0024e9d0 000007fe`d7d129b6 chrome_child!ovly_debug_event+0x7ed5c
00000000`0024eaf0 000007fe`d7d11b8c chrome_child!ovly_debug_event+0xca586


Credit:

Yuki Chen Of Qihoo 360 Vulcan Team