CVE-2020-15564

 

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

Last modified: - 03-05-2022 03:57

Total changes: - 3

Description

An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the guest will be correctly aligned. As a result, a malicious guest could cause a hypervisor crash by passing a misaligned address. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). All Xen versions are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.

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-327.html
• [oss-security] 20200707 Xen Security Advisory 327 v3 (CVE-2020-15564) - Missing alignment check in VCPUOP_register_vcpu_info-Mailing List, Patch, Third Party Advisory
• DSA-4723-Third Party Advisory
• FEDORA-2020-fbc13516af-Mailing List, Third Party Advisory
• FEDORA-2020-76cf2b0f0a-Mailing List, Third Party Advisory
• GLSA-202007-02-Third Party Advisory

 

Keywords

NVD

 

CVE-2020-15564

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures