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FreeBSD : xen-kernel -- broken check in memory_exchange() permits PV guest breakout (90becf7c-1acf-11e7-970f-002590263bf5)

high Nessus Plugin ID 99240

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The Xen Project reports :

The XSA-29 fix introduced an insufficient check on XENMEM_exchange input, allowing the caller to drive hypervisor memory accesses outside of the guest provided input/output arrays.

A malicious or buggy 64-bit PV guest may be able to access all of system memory, allowing for all of privilege escalation, host crashes, and information leaks.

Solution

Update the affected package.

See Also

https://xenbits.xen.org/xsa/advisory-212.html

http://www.nessus.org/u?f963a2e3

Plugin Details

Severity: High

ID: 99240

File Name: freebsd_pkg_90becf7c1acf11e7970f002590263bf5.nasl

Version: 3.10

Type: local

Published: 4/7/2017

Updated: 6/3/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

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

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:xen-kernel, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/6/2017

Vulnerability Publication Date: 4/4/2017

Reference Information

CVE: CVE-2017-7228

IAVB: 2017-B-0042-S