How Microsoft Made Windows Secure From Ground Up

Microsofts Steve Lipner, who was a major proponent of the need for a secure development methodology, talks about the successes of Microsofts push--and the costs.

When Microsoft announced the Trustworthy Computing Initiative more than a decade ago, it seemed little more than a marketing push. Yet the company managed to create a sustained security program aimed at locking down its software. A key component of the initiative is the Secure Development Lifecycle (SDL), an iterative approach to programming that helps identify and resolve security weaknesses.
For more than a decade, the SDL has generated impressive results for Microsoft--leading, for example, to
the decline of critical vulnerabilities in 2011
to their lowest level in five years.
Steven Lipner, the partner director of program management for Microsofts Trustworthy Computing, had once held the belief that the computer security could be solved in a provable way. After a decade of working on Microsoft security, Lipner is the first to admit his former naivete.
Dark Reading
caught up with Lipner before the coming RSA Conference and talked about the success of the SDL and its costs.
DR: In what ways has the SDL paid off for Microsoft and its code base? What sort of metrics does Microsoft look at to gauge success or failure?
Lipner:
In terms of measuring success, we look at a couple things. One of them is customer confidence--do people believe that we are in fact doing the right thing in developing software securely? And on that front, [a decade ago] Microsoft was not in the best position from a security perspective, whereas today we are in a much better position. So from that perspective, we view the initiative as successful.
Internally, we look at numbers, we look at metrics. We look at how many vulnerabilities, how many issues we have to fix. And that includes severity--how much impact do the vulnerabilities have on customers? We also look at the exploitability index. We have the exploitability index out for more than 18 months, and we are looking at that to say, OK, if there are vulnerabilities out there and they are discovered, how hard is it to exploit them and do harm to our customers?
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How Microsoft Made Windows Secure From Ground Up