Adobe's advisory: http://www.adobe.com/support/security/advisories/apsa10-03.html
Is there any way to protect yourself against this without blocking Flash, until you get the update (due Sept 27)? I would try the --safe-plugins option, which runs all your plugins in a sandbox. It could break some features, like Flash might not be able to access your webcam or microphone anymore. If I get the chance I'll try this out and let you know if anything breaks.
Note that as of today, Sept 13, virtually all web users are vulnerable to zero-day exploits for 3 different browser plugins, for which no fix is available:
- Quicktime 7.6.7 for IE
- Adobe Reader 9.3.4 for all platforms
- Adobe Flash 10.1.82 for all platforms