Most of the time security problems lie in the programming of specific services on the system, so unless you can manually alter a setting or two to perform the same actions as the security update, then the only option is to limit the use of the affected services on your system. Without an official security update, addressing security vulnerabilities that are found may be a bit of a challenge, if possible at all.
#Firefox for mac 10.5.8 update update
While the fixes addressed in the latest security update can be easily implemented in systems by manually disabling the DigiNotar root certificates in Apple's Keychain Access utility (see below), it also means that future security updates may not be supported for these systems. With the latest Security Update, OS X 10.5 users can open these root certificates in Keychain Access and set the system to never trust them (see below). Apple stopped supplying OS updates for PowerPC-based systems with the OS X 10.5.8 update, but this is the first time that Apple has no longer supported them with security fixes. This requirement for having at least Snow Leopard means that any Mac user running a PowerPC system, be it a G4 or a G5, will not be able to run the latest security update. If you have an early Intel-based Mac that is running Tiger or Leopard, then the only way to ensure you can update it is to upgrade your system at least to Snow Leopard. Unlike previous security updates that have supported Leopard and even Tiger, Apple's latest update requires OS X 10.6 and OS X 10.7, and this means that users running OS X 10.5 will not be able to update their systems. Last week Apple released a security update to address the DigiNotar root certificate vulnerability, but in doing so revealed that the company may no longer support PowerPC-based Macs, at least when it comes to security updates.
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