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Vulnerability of QEMU: read-write access via virtiofsd

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions via virtiofsd of QEMU, in order to read or alter data on the host system.
Impacted products: QEMU, RHEL.
Severity of this bulletin: 2/4.
Creation date: 22/01/2021.
Références of this threat: CVE-2020-35517, RHSA-2021:0711-01, RHSA-2021:0743-01, VIGILANCE-VUL-34401.

Description of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions via virtiofsd of QEMU, in order to read or alter data on the host system.
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This cybersecurity bulletin impacts software or systems such as QEMU, RHEL.

Our Vigil@nce team determined that the severity of this cybersecurity weakness is medium.

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 vulnerability bulletin.

Solutions for this threat 

QEMU: patch for virtiofsd.
A patch is indicated in information sources.

RHEL 8: new virt-8.2 module.
The following module is updated:
  RHEL 8 Module: virt:8.2

RHEL 8: new virt-rhel module.
The following module is updated:
  RHEL 8 Module: virt:rhel
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