Safari 5.1.7 also improves browser responsiveness in low memory situations, fixes a problem that could prevent Web pages from responding after using a pinch-to-zoom gesture, and addresses several security vulnerabilities related to WebKit. Flash is frequently a source of security issues and this limits the window during which Safari users are likely to be exposed to known Flash vulnerabilities. This is similar to a feature Mozilla added to the Firefox Web browser in 2009 and is a strong move to protect Mac users. If you are running Flash 10.1.102.64 or older, Safari will disable it and redirect you to download and install a current version from Adobe. Newer versions check for updates automatically, which minimizes the chances a user will be exposed to Flash-related security issues. Flash versions 10.1.102.64 (yes, that’s a version number, not an IP address) and older don’t include the capability to update themselves to new releases, requiring users to update manually. Safari will now check the version of Flash you are running and disable it if it is not capable of updating itself to a current version. This is especially problematic with browser plug-ins like Adobe Flash that are easy to exploit remotely, but that few users think to upgrade. One of the biggest security vulnerabilities on Macs (or any system) comes from running out-of-date software. It’s a roughly 45 MB download via Software Update or from Apple’s Support Downloads page. Safari 5.1.7 - An even more interesting security-related improvement comes from Safari 5.1.7 for both 10.7 Lion and 10.6 Snow Leopard. Mac OS X Lion Update 10.7.4 Server Combo (1.49 GB) Mac OS X Lion Update 10.7.4 Server (738.71 MB)
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