Xen Project Insufficient TLB Flushing Vulnerability (XSA-275)

Medium Nessus Plugin ID 119656

Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a vulnerability allowing a guest system to potentially elevate privileges, access protected information, and perform a DoS against the host. Only AMD systems with IOMMU enabled are affected.

Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.

Solution

Apply the appropriate patch according to the vendor advisory.

See Also

https://xenbits.xen.org/xsa/advisory-275.html

https://xenbits.xen.org/gitweb/?p=xen.git;a=summary

Plugin Details

Severity: Medium

ID: 119656

File Name: xen_server_XSA-275.nasl

Version: 1.2

Type: local

Family: Misc.

Published: 2018/12/13

Updated: 2019/01/09

Dependencies: 78089

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2018-19961

CVSS v2.0

Base Score: 6.9

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

CVSS v3.0

Base Score: 9.3

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

Vulnerability Information

CPE: cpe:/o:xen:xen

Patch Publication Date: 2018/11/20

Vulnerability Publication Date: 2018/11/20

Reference Information

CVE: CVE-2018-19961, CVE-2018-19962

BID: 106182

IAVB: 2018-B-0149