Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from outside the guest) via a side-channel attack on a power/energy monitoring interface, aka a "Platypus" attack. NOTE: there is only one logically independent fix: to change the access control for each such interface in Xen.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-28368
• https://lists.fedoraproject.org/archives/list/[email protected]/message/5J66QUUHXH2RR4CNCKQRGVXVSOUFRPDA/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/XV23EZIMNLJN4YXRRXLQV2ALW6ZEALXV/
• https://platypusattack.com
• https://www.debian.org/security/2020/dsa-4804
• https://www.zdnet.com/article/new-platypus-attack-can-steal-data-from-intel-cpus/
• https://xenbits.xen.org/xsa/advisory-351.html
• http://www.openwall.com/lists/oss-security/2020/11/26/1
• http://xenbits.xen.org/xsa/advisory-351.html