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Security Leftovers

Submitted by Roy Schestowitz on Friday 24th of January 2020 08:59:59 PM Filed under
Security
  • Security updates for Friday

    Security updates have been issued by Debian (git and python-apt), Oracle (openslp), Red Hat (chromium-browser and ghostscript), SUSE (samba, slurm, and tomcat), and Ubuntu (clamav, gnutls28, and python-apt).

  • Why Networking Monitoring Tools are Important and How to Pick One?

    In today’s world, a business has to have a strong online presence to build a brand and to stay connected with the target demographic. To achieve that, it’s critical that your online network is protected against common cyber-attacks and hacking attempts so that there is minimal downtime. Network monitoring allows you to bolster your business network and also to make the most of your resources.

  • There are no root causes

    At the if statement, the CPU uses past measurements to make a prediction about which branch might be taken, and it then begins to execute that path, even though ‘x > y’ has not been executed or completed yet! At this point x or y may not have even finished being computed yet!

    Let’s assume for now our branch predictor thinks that ‘x > y’ is false, so we’ll start to execute the “return false” or any other content in that branch.

    Now the instructions ahead catch up, and we resolve “did we really predict correctly?”. If we did, great! We have been able to advance the program state asynchronously even without knowing the answer until we get there.

    If not, ohh nooo. We have to unwind what we were doing, clear some of the pipeline and try to do the correct branch.

    Of course this has an impact on timing of the program. Some people found you could write a program to manipulate this predictor and using specific addresses and content, they could use these timing variations to “access memory” they are not allowed to by letting the specualative executor contribute to code they are not allowed to access before the unroll occurs. They could time this, and retrieve the memory contents from areas they are not allowed to access, breaking isolation.

    [...]

    Our computers are still asynchronous, and contain many out-of-order parts. It’s hard to believe we have “found” every method of exploiting this. Indeed in the last year many more ways to bypass hardware isolation due to our systems async nature have been found.

»

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