In a move similar to Microsoft, Adobe have recently begun delivering security patches on the second Tuesday of each month and are also pre-announcing them. This Thursday the 4th September, they announced a critical (their highest of four security levels !) release for Adobe Reader versions 10 and 11 and Acrobat versions 10 and 11 – for both Windows and OS X. A critical release means that the vulnerabilities are already, or have a very high risk of, being exploited and if successfully exploited, could be used to hijack a personal computer and inject malware into it.
Adobe patched both Reader and Acrobat last “Patch Tuesday” which was August 12th and they have released patches three different times already this year. For a change, the frequently targeted Adobe Flash Player, which is more widely installed and used than Reader, will not be patched tomorrow. However, Adobe has already released 10 patches are varying criticality this year and we recommend checking that you have the latest version of this product installed.
In order to update Adobe Reader and Acrobat, open up these programs, if you have them installed, and then from the Help menu, click “Check for Updates”. We suggest you do this within 24 to 48 hours of the release tomorrow.