December 16, 2010, 9:19 AM — That pesky PDF distiller in Research In Motion's (RIM) BlackBerry Enterprise Server (BES) BlackBerry Attachment Service has yet again been identified as a security risk, and RIM has issued another "interim security update" to patch the vulnerability.
This latest BES security flaw is currently ranked 7.8, or "high severity," on a Common Vulnerability Scoring System (CVSS) scale of 0 to 10, with 10 representing the most critical flaws.
The vulnerability could allow a malicious individual to cause buffer overflow errors, which may result in arbitrary code execution on the computer that hosts the BlackBerry Attachment Service. While code execution is possible, an attack is more likely to result in the PDF rendering process terminating before it completes. In the event of such an unexpected process termination, the PDF rendering process will restart automatically but will not resume processing the same PDF file.
Successful exploitation of this issue requires a malicious individual to persuade a BlackBerry smartphone user to open a specially crafted PDF file on a BlackBerry smartphone that is associated with a user account on a BlackBerry Enterprise Server. The PDF file may be attached to an email message, or the BlackBerry smartphone user may retrieve it from a web site using the Get Link menu item on the BlackBerry smartphone.
The following BES versions are affected and should be updated immediately, according to RIM:
* BlackBerry Enterprise Server Express version 5.0.1 and 5.0.2 for Microsoft Exchange
* BlackBerry Enterprise Server Express version 5.0.2 for IBM Lotus Domino
* BlackBerry Enterprise Server versions 4.1.3 through 5.0.2 for Microsoft Exchange and IBM Lotus Domino
* BlackBerry Enterprise Server versions 4.1.3 through 5.0.1 for Novell GroupWise
* BlackBerry Professional Software version 4.1.4 for Microsoft Exchange and IBM Lotus Domino
These PDF-distiller-related BlackBerry Attachment Service vulnerabilities in BES are anything but uncommon at this point. In fact, RIM issued at least four different PDF-distiller-related security updates since the summer of 2008. (Find information on those previous BES security flaws here, here, here and here.)