Critical vulnerabilities have been identified in Adobe Reader and Acrobat 8.1.2 and earlier versions. These vulnerabilities would cause the application to crash and could potentially allow an attacker to take control of the affected system.
Acrobat and Reader version 9 is not vulnerable to these particular flaws. A few interesting things to note here. No patch for Acrobat/Reader 7 and earlier has been released. Additionally, the update is available only by moving to a new version of Acrobat/Reader, either version 8.1.3 or 9. This may cause significant pain and stress among organizations that have standardized on Acrobat or Reader, especially in FDA validated systems. This is because Adobe has not made it possible to just apply a security update patch to the affected software. Instead, organizations must deploy a new version, which may contain additional changes including a changed user interface, changed behavior, and changed compatibility. Therefore, I expect some organizations may choose to live with the risk rather than move into a new version, and have to re-document and re-validate processes according to an updated version of Acrobat or Reader.