The full report confirms that Microsoft funded the study, and is sure to prompt further accusations of bias. But the researchers are providing the full methodology and challenging other security experts to test the legitimacy of their results.
Richard Ford, a research professor in the computer sciences department at the Florida Institute of Technology's College of Engineering, and Herbert Thompson, director of research and training at Security Innovation, a security technology provider, conducted the study. They used the ICAT Metabase, a database of vulnerabilities from the National Institute of Standards and Technology to measure the severity of the various vulnerabilities identified over the course of 2004. The report also tabulated the "days of risk" from the time vulnerabilities were publicly identified to the time they were fixed.
The report drew criticism from Red Hat. The head of the company's Security Response Team, Mark Cox, said on his blog,"Red Hat was not given an opportunity to examine the 'Role Comparison Report' or its data in advance of publication and we believe there to be inaccuracies in the published 'days of risk' metrics. These metrics are significantly different from our own findings based on data sets made publicly available by our Security Response Team."
Researchers analyzed the two systems configured as Web servers with add-on software.
- Researchers found that the Red HatLinux had 3,893 total days of risk for all the risks classified as high severity, compared to 1,145 for Windows Server 2003.
- The average days of risk per vulnerability were 71.4 for Red Hat Enterprise Linux, compared with 31.3 for Windows Server.
- The team also looked at the vulnerability of the two systems to a port scan. They found that Red Hat Enterprise Linux had 77 high-severity vulnerabilities in its default configuration compared to 33 for Windows Server 2003, out of a total vulnerability count of 174 for Red Hat vs. 52 for Windows.
However, Thompson admitted that the relative severity of a vulnerability doesn't necessarily correlate with how much damage an attack can cause. "I have seen multiple instances where l5 low severity vulnerabilities have been combined into an attack that would have done damage as bad as a high severity attack," he said. He also cautioned that the "attack surface" of both systems could be mitigated simply by turning on the firewalls that come with both Windows Server and Enterprise Linux.
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