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SMTP servers are vulnerable to several protocol level exploits including buffer-overflow attacks and SMTP command attacks. Buffer-overflow attacks A buffer-overflow attack is triggered when a program or process tries to store more data in a memory buffer than the buffer s designed capacity. The extra information can spill into adjacent buffers, corrupting or overwriting the valid data that they hold. In buffer-overflow attacks, the extra data may contain code designed to trigger specific actions, in effect sending new instructions to the attacked computer. Buffer-overflow attacks can be mounted against an organization s SMTP server by sending large SMTP commands. The best deterrent to a buffer-overflow attack against the SMTP server is to stop the attacker at the network perimeter, before the exploit ever finds its way into the corporate network. Attackers use buffer-overflow exploits to disable specific server services with the intent of mounting a denial-of-service (DoS) attack, either by disabling a specific service on the target computer or by taking the entire machine offline. More elaborate bufferoverflow exploits can be used to disable key security features and allow the attacker to run commands of his choice on the targeted machine.

in [0..<puz.gridSize]) { x:Integer = (idx mod puz.gridDim); y:Integer = (idx / puz.gridDim); b = SwingButton { layoutX: x * cellSize; layoutY: y * cellSize; width: cellSize; height: cellSize; text: bind notZero(puz.grid[idx]); font: gridFont; foreground: bind if(puz.clashes[idx]) Color.RED else if(puz.fixed[idx]) Color.BLACK else Color.GRAY; action: function():Void { if(puz.fixed[idx]) { return; } var v = puz.grid[idx]; v = (v+1) mod (puz.gridDim+1); puz.grid[idx] = v; }

When you click Start A New Meeting, you are required to enter a meeting name and a password. The default meeting name is the People With Me name and the current time. You can change the meeting name to anything, but if you are setting up an Ad Hoc Wireless Meeting, as discussed later in this lesson, the name must contain fewer than 15 characters. The meeting password has the same security requirements as a user s logon password. On a stand-alone Windows Vista computer, this means a length of eight characters with mixed case, numbers, and symbols. Meeting passwords need to be sent to participants prior to a meeting. Options include using the phone, Short Message Service (SMS), e-mail, or Instant Messenger, if participants have the appropriate software installed. Remember that you cannot use People Near Me as an instant messaging client to send this information even though the taskbar icon is similar to that of Windows Live Messenger.

9

Important These SMTP vulnerabilities are well known, and most SMTP servers are either not vulnerable to the exploits or can be patched so that they are not vulnerable. However, ISA Server can block the attack at the network perimeter so that the attack does not reach the SMTP server.

After you have created the meeting, you can either wait for people to arrive or send them an invitation. Invitations are not required to join a meeting; only the meeting password is a necessity. There are three methods of sending invitations:

SMTP command attacks SMTP servers must support a standard set of commands that are used to send and receive SMTP messages. Attackers can use the commands to mount buffer-overflow attacks or to send malformed commands that the system programmers did not anticipate. Command-manipulation attacks can lead to system compromise by giving an attacker access to key files, the ability to overwrite files, or to inject Trojan horse programs onto a mail server. Some SMTP commands are optional. Some commands, such as EXPN and VRFY, if configured incorrectly, can be used to find a list of recipients on the server. If these commands are not required, they can be disabled at the firewall so that the SMTP server does not receive them.

}; x/=puz.boxDim; y/=puz.boxDim; var bg = if((x mod 2)==(y mod 2)) gridCol1 else gridCol2; var jb = b.getJComponent() as JButton; jb.setContentAreaFilled(false); jb.setBackground(bg); jb.setOpaque(true); jb.setBorder(border); jb.setBorderPainted(true); b;