Microsoft Windows LoadUvsTable() Buffer Overflow

`# Date: 15-03-2017  
# Author: Hossein Lotfi (https://twitter.com/hosselot)  
# CVE: CVE-2016-7274  
  
1. Description  
  
An integer overflow error within the "LoadUvsTable()" function of usp10.dll  
can be exploited to cause a heap-based buffer overflow. Full analysis is  
available at:  
  
http://blogs.flexerasoftware.com/secunia-research/2016/12/microsoft_windows_loaduvstable_heap_based_buffer_overflow_vulnerability.html  
  
  
2. Proof of Concept  
  
open aC:\Windows\Fonts\phagspa.ttfa in a hex editor and change the value at  
offset 0x2051 from 0x00000006 to 0x33333334.  
  
  
3. Solution:  
  
Microsoft initially tried to fixed the issue in MS16-147, but the fix was  
incomplete and the issue remained unpatched til Microsoft March 2017 patch  
release:  
  
https://twitter.com/hosselot/status/809059287037251584  
  
It appears MS17-013 finally fixed the vulnerability properly:  
  
https://technet.microsoft.com/en-us/library/security/ms17-013.aspx  
  
@hosselot  
  
`