Krystian Kloskowski has discovered a vulnerability in Safari, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to plug-ins being unloaded when navigating to a new page while the user interacts with the plug-in (e.g. displays the context menu). If the plug-in has called a blocking function (e.g. TrackPopupMenu) before Safari navigates to another page, the API call may block until after Safari unloaded the plug-in, which can lead to the API call returning to freed memory.
The vulnerability is confirmed in version 5.1.2 (7534.52.7) on Windows using the RealPlayer and Adobe Flash plug-ins. Other versions may also be affected.
Solution: No effective workaround is currently available.
Provided and/or discovered by: Krystian Kloskowski (h07) via Secunia
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Subject: Apple Safari Plug-in Unloading Vulnerability
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