While Mac OS X 10.6.8 resolves numerous security vulnerabilities for Snow Leopard users, those still using Mac OS X 10.5 Leopard should download and install Security Update 2011-004. The most important fix is to AirPort, and it prevents an attacker on the same Wi-Fi network from causing your Mac to reboot. Other affected aspects of Mac OS X include ColorSync, CoreGraphics, ImageIO, MySQL, patch, Samba, servermgrd, and Subversion. Separate standalone updates are available for Leopard and Leopard Server, though it’s still easiest to let Software Update do its thing. (Free; 256.4 MB, 499.8 MB)
Viewing Wi-Fi Details in Snow Leopard
In Snow Leopard, hold down the Option key before clicking the AirPort menu. Doing so reveals additional technical details including which standards, speeds, and frequencies you're using to connect, as well as what's in use by other networks. With the Option key held down and with a network already joined, the AirPort menu reveals seven pieces of information: the PHY Mode, the MAC (Media Access Control) address, the channel and band in use, the security method that's in use, the RSSI (Received Signal Strength Indication) measurement, the transmit rate, and the MCS Index. In Leopard, some, but not all, of these details are revealed by Option-clicking the AirPort menu.
Security Update 2011-004 (Leopard/Leopard Server)
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