AMD Flaws Acknowledged

save
Share and earn Cybytes
Facebook Twitter Google+ LinkedIn Email

CTS-Labs published several AMD flaws over a week ago. For those of us who read vulnerability disclosures regularly, this particular disclosure was curious. Not only was the branded website bereft of any real technical details, but it also lacked any type of information about coordination with AMD. The disclosure also had bizarre legal disclaimers, including the following:

“The opinions expressed in this report are not investment advice nor should they be construed as investment advice or any recommendation of any kind.”1

In fact, were it not for Trail of Bits stepping forward and acknowledging they had been paid by CTS-Labs to review and confirm the accuracy of CTS-Labs findings, the whole thing would have been difficult to take seriously.

However, as of this morning, AMD has published a detailed acknowledgement of the CTS-Labs vulnerabilities. Although no patches have been published, we have a much better understanding of the severity of these vulnerabilities and our customers’ exposure.

Vulnerability details

Despite the flashy website and many news articles since the disclosure, our assessment is the AMD vulnerabilities are overhyped and nowhere near the severity of Spectre and Meltdown. Those two flaws were particularly concerning for two reasons. First, they’re based on fundamental flaws in the design of processors. Secondly, those vulnerabilities can be exploited by unauthenticated remote attacks. For example, the Spectre whitepaper specifically mentions a JavaScript proof of concept.

Impact assessment

All the discussed AMD flaws, except CHIMERA-HW, are firmware issues. Patching firmware issues is significantly easier than mitigating a hardware flaw. AMD is likely to push out a firmware fix relatively quickly since we’ve seen it done before. CHIMERA-HW does look like it’s a vulnerability at the hardware level. CTS-Labs is very quick to call this a “Manufacturer Backdoor.” More likely, it’s probably just unintentionally poor design work.

Prevalence

The other part of this vulnerability that needs to be considered is AMD’s prevalence. Meltdown and Spectre were a big deal because they affected a large variety of processors. AMD represents about 20 percent of the CPU market share, and only a subset of that is vulnerable to these vulnerabilities.

(No) Urgently required actions

These vulnerabilities aren’t good, but you probably shouldn’t lose sleep over them either. AMD reported they will provide firmware updates and mitigations “in the upcoming weeks.” That seems about as good as you can ask, given CTS-Labs’ lack of coordination effort.

Tenable is actively researching new plugins to identify these issues. As always, ensuring administrator access is restricted to only the most trusted users will go a long way in protecting everybody from these vulnerabilities.

Share this post and earn Cybytes
Facebook Twitter Google+ LinkedIn Email
Follow
1573 Followers
About Tenable
Tenable™, Inc. is the Cyber Exposure company. Over 24,000 organizations of all sizes around the globe rely on Tenable to manage and measure their modern attack surface to accurately understand and reduce cyber risk. As the creator of Nessus®, Tenable built its platform from the ground up to deeply understand assets, networks and vulnerabilities, extending this knowledge and expertise into Tenable.io™ to deliver the world’s first platform to provide live visibility into any asset on any computing platform. Tenable customers include over 50 percent of the Fortune 500, large government agencies and organizations across the private and public sectors. Learn more at tenable.com.
Promoted Content
Five Steps to Building a Successful Vulnerability Management Program
Is your vulnerability management program struggling? Despite proven technology solutions and the best efforts of IT teams, unresolved vulnerabilities remain an ongoing source of friction and frustration in many organizations. Regardless of how many vulnerabilities are fixed, there will always be vulnerabilities that can’t easily be remediated – and too often, finger-pointing between IT teams and business groups can ensue.

Our Revolution

We believe Cyber Security training should be free, for everyone, FOREVER. Everyone, everywhere, deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is a free community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.

Cybrary On The Go

Get the Cybrary app for Android for online and offline viewing of our lessons.

Get it on Google Play
 

Support Cybrary

Donate Here to Get This Month's Donor Badge

 
Skip to toolbar

We recommend always using caution when following any link

Are you sure you want to continue?

Continue
Cancel