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"Office Web Apps are the webified version of Word, Excel, etc., and we expect them to have lesser impact on IT, as the applications have fewer installations," he said. "In any case, Server Administrators need to take a good look at this bulletin to see if they need to take action."
Web-Based Attack Risks
Marcus Carey, a security researcher at Rapid 7, told us Bulletins 2 and 5, both critical, will affect most consumers and enterprises since they fix vulnerabilities that would allow an attacker to remotely execute code on all Windows platforms. Both of these bulletins fix vulnerabilities that potentially could be leveraged as web-based attacks, he said, however they would be difficult to exploit and achieve remote code execution.
"Bulletin 6 is rated as important and affects all supported Microsoft operating systems except for Windows RT. Since it's rated as important it probably requires a special set of circumstances to actually exploit, which would probably require some sort of victim participation such as opening malicious files," Carey said.
"Bulletin 7 is important and only affects Windows Server 2012 and Windows Server 2008 R2. It could allow an attacker to bypass at least one security measure on those operating systems. Since it is rated as important it may only work under limited circumstances and configurations."