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Wednesday, April 14, 2010, 04:30 pm PT (07:30 pm ET)

Apple fixes 27-inch iMac glitches, issues Mac OS X security updates

Apple on Wednesday afternoon issued a number of updates, addressing high processor usage and other glitches in its 27-inch iMac, as well as various security updates for Mac OS X 10.6 Snow Leopard and Mac OS X 10.5 Leopard.

27-inch iMac updates

Two updates released Wednesday address issues with the 27-inch big screen iMac, released in October 2009.

"27-inch iMac EFI FW Update 1.0" is recommended for all systems with quad-core Intel Core i5 and Core i7 processors. The update resolves an issue that caused high processor utilization when playing audio through the headphone output, and fixes a problem that prevented the display backlight from turning on after powering on the iMac.

The 2.1MB update is available for download from Apple. It requires Mac OS X 10.6.3 or later.

"27-inch iMac SMC Firmware Update 1.0" fixes Target Display Mode compatibility issues on the 27-inch desktop iMac. The 397KB update also requires Mac OS X 10.6.3 or later.

Snow Leopard, Leopard security updates

Also Wednesday, Apple issued Security Update 2010-003 for Snow Leopard (6.50MB), Leopard Client (218.6MB), and Leopard Server (379.5MB). The update addresses a vulnerability related to viewing or downloading a document containing a maliciously crafted embedded font. Discovery of the exploit is credited to researcher Charlie Miller, who worked with TippingPoint's Zero Day Initiative and reported the issue to Apple.

Finally, Server Admin Tools 10.6.3, a 236MB update, was released. The update includes the latest releases of iCal Server Utility, Podcast Composer, Server Admin, Server Monitor, Server Preferences, System Image Utility, Workgroup Manager, and Xgrid Admin. It is recommended for remote administration of Snow Leopard Server.