Detections
Analytics

Xen Hypervisor XENMEM_exchange Memory Disclosure (XSA-212)

high Nessus Plugin ID 99399

Language:

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 out-of-array memory access error in the memory_exchange() function in file common/memory.c due to improper checking of XENMEM_exchange input. An attacker on a 64-bit PV guest VM who has administrative privileges can exploit this issue to access arbitrary system memory locations, which can then be potentially used for further compromising the host.

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-212.html

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

Plugin Details

Severity: High

ID: 99399

File Name: xen_server_XSA-212.nasl

Version: 1.5

Type: local

Family: Misc.

Published: 4/14/2017

Updated: 6/3/2021

Configuration: Enable paranoid mode

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: cpe:/o:xen:xen

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/4/2017

Vulnerability Publication Date: 4/4/2017

Reference Information

CVE: CVE-2017-7228

BID: 97375

IAVB: 2017-B-0042-S