In an advisory, RIM warned that a corrupt TIFF (Tagged Image File Format) attachment could be used in an attack that would stop a user from being able to view attachments. The bug was first flagged by a researcher known as “FX” during a presentation at the 22nd Chaos Communication Congress, where multiple RIM BlackBerry products came under the security microscope. Even as RIM downplayed the risk as a denial-of-service condition, the U.S.-CERT (Computer Emergency Readiness Team) said the vulnerabilities discussed by “FX” could allow an attacker to execute arbitrary code on the BlackBerry Attachment Service.