Research In Motion yesterday released an "interim security update" for BlackBerry Enterprise Server (BES) 5.0 Service Pack 2 (SP2) for Microsoft Exchange and IBM Lotus Domino due to a vulnerability that could potentially allow a hacker or other malicious person access to organizations' BES infrastructure. That flaw could also be used to execute Denial of Service (DoS) attacks, according to the BlackBerry-maker. And it affects not just the full version of BES, but the free BES Express, as well.\n\n\n\n\n BlackBerry Enterprise Server (BES) Diagram\n\nAnd the BES security flaw is currently ranked 7.6, or "high severity," on a Common Vulnerability Scoring System (CVSS) scale of 0 to 10, with 10 representing the most critical flaws.\n\nFrom RIM:\n\n"The vulnerability could allow a malicious individual to cause buffer overflow errors, leading to a Denial of Service (DoS) condition or possibly arbitrary code execution on the computer that the BlackBerry Attachment Service runs on.\n\n"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."\n\nThe BES 5.0.2 flaw is related to the BlackBerry Attachment Service's PDF distiller component, and it's not the first time RIM has had to issues patches and security advisories due to problems with the PDF distiller. In fact, RIM issued at least three different PDF-distiller-related security updates since the summer of 2008. (Find information on those previous BES security flaws here, here and here.)\n\n\n\n\nRIM advises BES administrators to update their BES 5.0.2 software for Exchange and Lotus Domino immediately, but to do so with caution, since performing the update process wrong can lead to additional issues. Find specifics on the BES flaw and the associated update process at RIM's BlackBerry Technical Solution Center.\n\n\nAnd download the BES security patch for Exchange and Lotus Domino here.\n\n\nAS\n\nVia @banthon\n\n\n\n\n\n\n Al Sacco covers Mobile and Wireless for CIO.com. Follow Al on Twitter @ASacco. Follow everything from CIO.com on Twitter @CIOonline. Email Al at ASacco@CIO.com.