CVE-2020-15563

 

Published at: - 07-07-2020 03:15

Last modified: - 03-05-2022 03:59

Total changes: - 3

Description

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• http://xenbits.xen.org/xsa/advisory-319.html
• [oss-security] 20200707 Xen Security Advisory 319 v3 (CVE-2020-15563) - inverted code paths in x86 dirty VRAM tracking-Mailing List, Third Party Advisory
• DSA-4723-Third Party Advisory
• openSUSE-SU-2020:0965-Mailing List, Third Party Advisory
• FEDORA-2020-fbc13516af-Mailing List, Third Party Advisory
• openSUSE-SU-2020:0985-Mailing List, Third Party Advisory
• FEDORA-2020-76cf2b0f0a-Mailing List, Third Party Advisory
• GLSA-202007-02-Third Party Advisory

 

Keywords

NVD

 

CVE-2020-15563

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures