The update fixes 13 security bugs in Leopard and Snow Leopard Apple has released a security update to its Mac OS X operating system, fixing 13 critical security issues in the software. The update, released early Tuesday afternoon fixes bugs in various Mac OS X components, including core components such as Apple Type Services and CFNetwork. It’s Apple’s fifth Mac OS X security update this year.Many open-source Mac OS X components are also patched, including Samba, PHP, and ClamAV software.[ Discover the key Mac, iOS, and Apple tech trends for business users. Read InfoWorld’s Technology: Apple newsletter. ] At least six of the bugs theoretically could be exploited by attackers to run unauthorized software on the Mac, Apple said.Microsoft’s Windows operating system remains the favorite target of online attackers, but security experts say it’s always a good idea to install these security updates as quickly as possible, no matter what the product.Robert McMillan covers computer security and general technology breaking news for the IDG News Service. Follow Robert on Twitter at @bobmcmillan. Robert’s e-mail address is robert_mcmillan@idg.com. Software DevelopmentPatch Management Software