A vulnerability in the Mac version of Microsoft Office v.X could allow an attacker to crash applications on a network.
An advisory on the bug identifies the anti-piracy mechanism in Office v.X as at fault.
The software contains a Network Product Identification Checker component which looks for multiple copies of Office running on the same network.
It does this by announcing its Product Identification Number to the network at certain intervals. If two copies of Office are detected on a network, they will be shut down.
But Microsoft warned that if a malformed announcement is sent to a machine or generally over the network, the Network Product Identification Checker mishandles the information and crashes.
Although not potentially devastating, when the application crashes, data could be lost.
The attack can be directed at a single Mac or thrown at an entire network.
Microsoft has released a patch, and an advisory can be found here.
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