CVE-2020-35517

Description

A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system daemon where a privileged guest user is able to create a device special file in the shared directory and use it to r/w access host devices. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Statement

This issue does not affect the version of the qemu-kvm package as shipped with the Red Hat Enterprise Linux 5, 6 and 7. Virtio-fs is fairly new and is not built in the Red Hat Enterprise Linux 5, 6 and 7.

This issue affects the version of the qemu-kvm package as shipped with the Red Hat Enterprise Linux 8. Future qemu-kvm package updates for Red Hat Enterprise Linux 8 may address this issue.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score7.58.2N/A
Attack VectorLocalLocalN/A
Attack ComplexityHighLowN/A
Privileges RequiredHighHighN/A
User InteractionNoneNoneN/A
ScopeChangedChangedN/A
ConfidentialityHighHighN/A
Integrity ImpactHighHighN/A
Availability ImpactHighHighN/A

Vector

Red Hat: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

NVD: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Understanding the Weakness (CWE)

CWE-269

Access Control

Technical Impact: Gain Privileges or Assume Identity

Acknowledgements

Red Hat would like to thank Alex Xu (alxu.ca) for reporting this issue.

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