CVE-2020-15564
Severity CVSS v4.0:
Pending analysis
Type:
CWE-119
Buffer Errors
Publication date:
07/07/2020
Last modified:
07/11/2023
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.
Impact
Base Score 3.x
6.50
Severity 3.x
MEDIUM
Base Score 2.0
4.90
Severity 2.0
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:* | 4.8.0 (including) | 4.13.1 (including) |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | ||
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | ||
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- http://www.openwall.com/lists/oss-security/2020/07/07/5
- http://xenbits.xen.org/xsa/advisory-327.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/
- https://security.gentoo.org/glsa/202007-02
- https://www.debian.org/security/2020/dsa-4723