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Description This alert notifies you that a TCP SYN packet was sent with a spoofed source IP address and port number that match those of the destination IP address and port. If the attack is successfully mounted, it can cause some TCP implementations to go into a loop that causes the computer to fail. This alert notifies you that an IP fragment was received with more data than the maximum IP packet size. If the attack is successfully mounted, a kernel buffer overflows, which causes the computer to fail. This alert notifies you that an attempt was made to access more than the preconfigured number of ports. You can specify a threshold, indicating the number of ports that can be accessed. This alert notifies you that repeated attempts to send TCP packets with invalid flags were made. During an IP half-scan attack, the attacking computer does not send the final ACK packet during the TCP three-way handshake. Instead, it sends other types of packets that can elicit useful responses from the target host without causing a connection to be logged. This is also known as a stealth scan, because it does not generate a log entry on the scanned host. If this alert occurs, log the address from which the scan occurs. If appropriate, configure the ISA Server rules to block traffic from the source of the scans. This alert notifies you that there is an attempt to send an illegal UDP packet. These UDP packets will cause some older operating systems to fail when the packet is received. If the target machine does fail, it is often difficult to determine the cause.

Figure 7-32

The isInitialized() built-in function allows us to test whether a given variable has been explicitly set. In our third example only the name variable is set in the object literal, so the warning message tells us that Thunderbird 5 has no crew (which, in itself, might demand the attention of International Rescue!). Conveniently, isInitialized() isn t fooled by the fact that crew, as a value type, will have a default (unassigned) value of 0. The isInitalized() function is handy for knowing whether an object literal bothered to set an instance variable, so we can assign appropriate initial values to those variables it missed. Alternatively you could provide multiple means of configuring an object, like separate lengthCm and lengthInches variables, and detect which was used. Moving on to the fourth example, you ll note that it looks like the way we create new object instances in Java. Indeed, that s intentional. There may be times when we are forced to instantiate a Java object using a specific constructor; the new syntax allows us to do just that. But new can be used on any class, including JavaFX Script classes; however, we should resist that temptation. The new syntax should be used only when JavaFX Script s declarative syntax will not work (the example is bad practice!)

ISA Server also provides built-in application filters that detect DNS networking protocol and Post Office Protocol (POP) intrusions. The DNS intrusion-detection filter detects the following known DNS exploits:

Figure 7-33

DNS host name overflow A DNS host name overflow occurs when a DNS response for a host name exceeds a certain fixed length (255 bytes). Applications that do not check the length of the host names may overflow internal buffers on the server when copying this host name, allowing a remote attacker to execute arbitrary commands on a targeted computer. This filter inspects the response that an internal client receives from an external DNS server. DNS length overflow DNS responses for IP addresses contain a length field, which should be 4 bytes. By formatting a DNS response with a larger value, some applications executing DNS lookups will overflow internal buffers, potentially

7-39

For more information, access http://go.microsoft.com/fwlink/ LinkId=64343 and http:// go.microsoft.com/fwlink/ LinkId=64382.

Despite its awesome power, the Enigma machine was blissfully simple by design. Predating the modern electronic computer, it relied on old-fashioned electric wiring and mechanical gears. The system consisted of four parts: three rotors and a reflector.

allowing a remote attacker to execute arbitrary commands on a targeted computer. This filter inspects the response that an internal client receives from an external DNS server.

7

DNS zone transfer A malicious user executes a zone transfer to gather a list of all the host names in a domain. This filter detects when an Internet user attempts to execute a zone transfer from an internal DNS server through ISA Server.

The POP filter intercepts and analyzes POP traffic destined for the published servers. The application filter checks for POP buffer overflow attacks. A POP buffer overflow attack occurs when a remote attacker attempts to gain root access to a POP server by overflowing an internal buffer on the server.

Quick Check Answer From Control Panel click Allow A Program Through Windows Firewall. This opens the Windows Firewall Settings dialog box. In the Advanced tab click Restore Defaults.