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Vulnerability of Xen: information disclosure via a side channel

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass the virtual memory barriers via a side channel in Xen, in order to get sensitive information from the host system or others guests.
Impacted systems: Xen.
Severity of this alert: 1/4.
Creation date: 11/03/2020.
Références of this alert: CERTFR-2020-AVI-144, CVE-2020-0551, VIGILANCE-VUL-31763, XSA-315.

Description of the vulnerability 

An attacker, inside a guest system, can bypass the virtual memory barriers via a side channel in Xen, in order to get sensitive information from the host system or others guests.
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This cybersecurity announce impacts software or systems such as Xen.

Our Vigil@nce team determined that the severity of this threat alert is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this computer weakness alert.

Solutions for this threat 

Xen: workaround for LVI.
A workaround is indicated in the information source.
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