In part three of our technical tour of Adobe Reader X Protected Mode , we’ll examine the broker policies and the inter-process communication (IPC) the sandbox process uses to communicate with it.
The broker process runs with regular user rights and allows the sandboxed processes indirect and secure access to objects based on policies. As the privileged controller, the broker process enables the sandboxed process to get its work done. Some actions are specifically white-listed as part of the broker policies and are allowed to be performed by the sandbox indirectly via the broker. White-listed actions include:
Writing to the user’s TEMP folder Writing (saving) Adobe Reader-specific user-modified preferences to the registry Launching a tracker to handle shared reviews Launch a .docx attachment in Microsoft WordInter-Process Communication (IPC)
The broker process’ IPC is the sandbox’s gateway to the rest of the operating system. The IPC exposed by the broker is also an attack surface of Protected Mode. Malicious code that runs inside the sandbox process may try to abuse functionality exposed by the broker process or exploit a vulnerability in the broker itself.
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Vupen said it confirmed the vulnerability affects Adobe Reader version 9.4 running on either Windows 7 or Windows XP SP3. In addition, it said Reader |
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The flaw remains exploitable through the Flash interpreter included in Adobe Reader and Acrobat, which are set to receive updates during the week of |
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The tablet also comes with Evernote, Adobe Reader, and Adobe Acrobat built in, along with some HP-branded software. The big question now is the price. |
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