This problem starts with Firefox reporting that your flash-plugin is out of date. This report looks like this and disables all-flash.
After this, we will take a look Mozilla’s Plugin Check to see what it thinks is going on.
Now here we can see that version 184.108.40.2060 is vulnerable. We will then check about:plugins to see if it agrees.
Again this is also reporting 220.127.116.110, so there must be a problem, but it also tells us that there is an update available. Now I run regular yum updates on this machine, and I actually noticed flash-plugin was updated just a few hours prior to seeing this alert. So lets check the installed version.
[root@ltmmattoon matthew]# yum info flash-plugin<br />
Loaded plugins: langpacks, refresh-packagekit<br />
Installed Packages<br />
Name : flash-plugin<br />
Arch : x86_64<br />
Version : 18.104.22.1682<br />
Release : release<br />
Size : 19 M<br />
Repo : installed<br />
From repo : adobe-flashplayer<br />
Summary : Adobe Flash Player 11.2<br />
URL : http://www.adobe.com/downloads/<br />
License : Commercial<br />
Description : Adobe Flash Plugin 22.214.171.1242<br />
: Fully Supported: Mozilla SeaMonkey 1.0+, Firefox 1.5+, Mozilla<br />
Interesting 126.96.36.1992, which is higher than what Firefox is reporting. Of course Firefox has been rebooted, but lets do it again just to make sure.
Now to fix it.
$ pwd<br />
$ mv pluginreg.dat pluginreg.dat.bak
Restart Firefox and it will collect new data on all of its plugins, and about:plugins will start reporting the correct version.