Safari is a web browser developed by Apple Inc. and included with the Mac OS X and iOS operating systems. First released as a public beta on January 7, 2003 on the company's Mac OS X operating system, it became Apple's default browser beginning with Mac OS X v10.3 "Panther". Safari is also the native browser for iOS.
In February 01, 2011, Apple released a Security Update regarding the security content of Safari 5.0.3 and Safari 4.1.3. memory corruption issue exists in WebKit's rendering of HTML object outlines. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory management. (CVE-2010-1813)
Visiting a maliciously crafted website may cause an unexpected application termination or arbitrary code execution.
Apple Safari 4.1.2 and previous versions
Visiting a maliciously crafted website may cause an unexpected application termination or arbitrary code execution
As detailed in HT4455, Apple has released updates to address these issues. Please refer to http://support.apple.com/kb/HT4455 for more details.
For FortiGate users, turning on these IPS signatures can prevent exploitation of this vulnerability: