Misbehaving employees also figure prominently in IT fears: Ninety-one percent of respondents say the risk of employee misconduct related to information systems worries them.

Another security worry is many line-of-business executives' tendency to see information security as solely IT's problem, Deloitte says. Forty percent of surveyed companies give IT the primary responsibility for information security, and 45 percent say top management is informed about security issues only on an ad hoc basis. And although 62 percent say security is a key imperative at the board or executive level, that number is low, says Deloitte, since security should be top strategic priority for every TMT company.

To mitigate these security threats, Deloitte recommends that security goals be integrated into business strategies and plans. Measuring ROI on security efforts and providing thorough and ongoing security training to all levels of the organization are also key, Deloitte advises. Training can educate employees on how to deal with the latest security threats and can serve as a reminder to stay vigilant. For more lessons on security ROI, see "How GE Uses Six Sigma to Drive Security ROI" and "Your Guide To Good-Enough Compliance."

"The technology, media and entertainment and telecommunications industries are still in a reactive mode when it comes to their approach to security," said Rena Mears, Deloitte's global and U.S. privacy and data protection leader, in a press release. "A prerequisite for effective information security is the implementation of a proactive information security strategy that is closely linked to the company's overall business strategy, business requirements, and key business drivers."