Rapid7 Vulnerability & Exploit Database

Ubuntu: USN-5617-1 (CVE-2020-15564): Xen vulnerabilities

Back to Search

Ubuntu: USN-5617-1 (CVE-2020-15564): Xen vulnerabilities

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
07/07/2020
Created
09/21/2022
Added
09/20/2022
Modified
09/20/2022

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.

Solution(s)

  • ubuntu-upgrade-libxendevicemodel1
  • ubuntu-upgrade-libxenevtchn1
  • ubuntu-upgrade-libxengnttab1
  • ubuntu-upgrade-libxenmisc4-11
  • ubuntu-upgrade-xen-hypervisor-4-11-amd64
  • ubuntu-upgrade-xen-hypervisor-4-11-arm64
  • ubuntu-upgrade-xen-hypervisor-4-11-armhf
  • ubuntu-upgrade-xen-utils-4-11
  • ubuntu-upgrade-xen-utils-common
  • ubuntu-upgrade-xenstore-utils

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;