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.
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
Source: MITRE
Published: 2020-11-10
Updated: 2022-01-01
Type: CWE-862
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 4.4
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 0.8
Severity: MEDIUM