EulerOS Virtualization 2.5.3 : kvm (EulerOS-SA-2019-1370)

Medium Nessus Plugin ID 124748

Synopsis

The remote EulerOS Virtualization host is missing a security update.

Description

According to the version of the kvm package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerability :

- A use-after-free vulnerability was found in the way the Linux kernel's KVM hypervisor emulates a preemption timer for L2 guests when nested (=1) virtualization is enabled. This high resolution timer(hrtimer) runs when a L2 guest is active. After VM exit, the sync_vmcs12() timer object is stopped. The use-after-free occurs if the timer object is freed before calling sync_vmcs12() routine. A guest user/process could use this flaw to crash the host kernel resulting in a denial of service or, potentially, gain privileged access to a system.(CVE-2019-7221)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected kvm package.

See Also

http://www.nessus.org/u?6bea2a99

Plugin Details

Severity: Medium

ID: 124748

File Name: EulerOS_SA-2019-1370.nasl

Version: 1.4

Type: local

Published: 2019/05/10

Updated: 2019/06/27

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.6

Temporal Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 7.8

Temporal Score: 7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:kvm, cpe:/o:huawei:euleros:uvp:2.5.3

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/uvp_version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2019/05/05

Reference Information

CVE: CVE-2019-7221