Xen Information Disclosure Vulnerability (XSA-305)

medium Nessus Plugin ID 134174
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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 an information disclosure vulnerability. A TSX Asynchronous Abort condition exists on some CPUs utilizing speculative execution. An authenticated, local attacker can exploit this to potentially enable information disclosure via a side channel.

Solution

Apply the appropriate patch according to the vendor advisory.

See Also

http://www.nessus.org/u?49587fdf

Plugin Details

Severity: Medium

ID: 134174

File Name: xen_server_XSA-305.nasl

Version: 1.2

Type: local

Family: Misc.

Published: 3/2/2020

Updated: 3/3/2020

Dependencies: xen_server_detect.nbin

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2019-11135

VPR

Risk Factor: High

Score: 7.7

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:xen:xen

Required KB Items: installed_sw/Xen Hypervisor, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2019

Vulnerability Publication Date: 11/12/2019

Reference Information

CVE: CVE-2019-11135