eSentire is aware of recently disclosed vulnerabilities in many modern processors. Speculative execution side-channel attacks (known as Meltdown and Spectre), could allow attackers to access information stored in protected memory for processes and operating systems. This can include passwords,
Operating system and software vendors have released updates which mitigate these vulnerabilities. Affected parties are highly encouraged to review and apply updates for relevant CVEs (listed below) on affected systems, and monitor vendor communication for updates as they are made available.
What we’re doing about it
- eSentire Threat Intelligence will continue to monitor the situation for future releases and updates.
What you should do about it
Review and deploy the following recommended OS and software vendor updates:
- Microsoft Guidance for client and server operating systems .
- Various Linux distributions have released updates. Continue to monitor vendor websites or
reposfor additional updates as they become available.
- VMware Guidance 
- Amazon AWS , Microsoft Azure  have begun patching underlying cloud infrastructure.
- Hardening web browsers against attack
- Block advertisements using an ad-blocker
- Update Mozilla Firefox to latest release 
- Implement Site Isolation in Google Chrome  ( Google indicates an update will arrive January
- Ensure Microsoft Edge and Internet Explorer 11 updates are installed 
- CVE-2017-5753 (Bounds Check Bypass - Spectre)
- CVE-2017-5715 (Branch Target Inspection - Spectre)
- CVE-2017-5754 (Targeted cache side-channel attacks - Meltdown)
CVE-2017-5754 (Meltdown) affects Intel x86-64
eSentire has not observed any attacks at this time and additionally, no major vendor has indicated that attacks have been observed at this time.
Although CERT recommends replacing affected CPU hardware, this likely not feasible for most organizations. We recommend the following guidance from OS and software vendors to apply updates on impacted systems in order to mitigate these vulnerabilities in a timely manner.
For more information please visit:
https://spectreattack.com/ contains relevant links to papers and vendor security bulletins.