# Exploit Title: GOM Player 2.3.10.5266 - Remote heap corruption (.fpx)
# Date: 2017-02-15
# Exploit Author: Peter Baris
# Exploit link: http://www.saptech-erp.com.au/resources/PoC.zip
# Software Link: http://player.gomlab.com/download.gom?language=eng
# CVE: CVE-2017-5881
# Version: 2.3.10.5266
# Tested on: Windows Server 2008 R2 x64, Windows 7 SP1 x64

POC:

https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41367.zip  

Open the malicious fpx file with CTRL+U, served by a webserver:

 WinDbg 

(864.150): Access violation - code c0000005 (first chance)

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

eax=092fcde8 ebx=00000000 ecx=41414141 edx=090ff798 esi=090ff790
edi=05b10000

eip=77902fe5 esp=10a9fbb4 ebp=10a9fc94 iopl=0         nv up ei ng nz na pe
cy

cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010287

ntdll!RtlpFreeHeap+0x4d6:

77902fe5 8b19            mov     ebx,dword ptr [ecx]
ds:002b:41414141=????????

 

0:022> !exchain

10a9fc84: ntdll!_except_handler4+0 (77946325)

  CRT scope  0, func:   ntdll!RtlpFreeHeap+b7d (7795b52d)

10a9fd54: *** WARNING: Unable to verify checksum for C:\Program Files
(x86)\GRETECH\GomPlayer\gvf.ax

*** ERROR: Symbol file could not be found.  Defaulted to export symbols for
C:\Program Files (x86)\GRETECH\GomPlayer\gvf.ax - 

gvf!DllGetClassObject+5801b (6e02bc7b)

10a9fdcc: gvf!DllGetClassObject+57af8 (6e02b758)

10a9fe00: gvf!DllGetClassObject+57ac8 (6e02b728)

10a9fe84: gvf!DllGetClassObject+57fe0 (6e02bc40)

10a9feac: gvf!DllGetClassObject+5d5e8 (6e031248)

10a9ff60: ntdll!_except_handler4+0 (77946325)

  CRT scope  0, filter: ntdll!__RtlUserThreadStart+2e (77946608)

                func:   ntdll!__RtlUserThreadStart+63 (77948227)

10a9ff80: ntdll!FinalExceptionHandler+0 (779983b1)

Invalid exception stack at ffffffff


2017-02-04 notification sent to developers

2017-02-05 developerss requested information about the issue

2017-02-09 information sent with the PoC

no reply if they plan to release a fix or not