Apple Monday pushed out two updates for Mac OS X 10.5 addressing the Flashback malware. Also posted is a Security Update 2012-003 again for Leopard that disabled outdated Adobe Flash Player that's susceptible to vulnerabilities.
Recently the company tackled the issues with OS X 10.6 and the current 10.7. These updates bring further legacy Macs into compliance. Also updated was Safari with additional security fixes within Mac OS X 10.7.4.
All updates are available via Apple's Software Update utility.