CVE-2019-19583

 

Published at: - 11-12-2019 07:16

Last modified: - 31-03-2022 08:19

Total changes: - 3

Description

An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of service (guest OS crash) because VMX VMEntry checks mishandle a certain case. Please see XSA-260 for background on the MovSS shadow. Please see XSA-156 for background on the need for #DB interception. The VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single Stepping is active, and blocked by STI/MovSS is active, despite this being a legitimate state to be in. The resulting VMEntry failure is fatal to the guest. HVM/PVH guest userspace code may be able to crash the guest, resulting in a guest Denial of Service. All versions of Xen are affected. Only systems supporting VMX hardware virtual extensions (Intel, Cyrix, or Zhaoxin CPUs) are affected. Arm and AMD systems are unaffected. Only HVM/PVH guests are affected. PV guests cannot leverage the vulnerability.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://xenbits.xen.org/xsa/advisory-308.html
• FEDORA-2019-6aad703290-Mailing List, Third Party Advisory
• FEDORA-2019-2e12bd3a9a-Mailing List, Third Party Advisory
• openSUSE-SU-2020:0011-Mailing List, Third Party Advisory
• DSA-4602-Third Party Advisory
• 20200114 [SECURITY] [DSA 4602-1] xen security update-Mailing List, Third Party Advisory
• GLSA-202003-56-Third Party Advisory

 

Keywords

NVD

 

CVE-2019-19583

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures