Xen Privilege Escalation (XSA-182) (Bunker Buster)

high Nessus Plugin ID 92701

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

According to its self-reported version number, the remote Xen hypervisor is affected by a privilege escalation vulnerability in the paravirtualization (PV) pagetable implementation due to incorrect usage of fast-paths for making updates to pre-existing pagetable entries. An attacker with administrative privileges on a PV guest can exploit this vulnerability to gain administrative privileges on the host operating system. This vulnerability only affects PV guests on x86 hardware; HVM and ARM guests are not 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 as referenced in the vendor advisory.

Plugin Details

Severity: High

ID: 92701

File Name: xen_server_XSA-182.nasl

Version: 1.9

Type: local

Family: Misc.

Published: 8/3/2016

Updated: 7/10/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2016-6258

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/o:xen:xen

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/26/2016

Vulnerability Publication Date: 7/26/2016

Reference Information

CVE: CVE-2016-6258

BID: 92131

IAVB: 2016-B-0118-S

Detections

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