CVE-2016-9386

high
New! CVE Severity Now Using CVSS v3

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

Description

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

References

http://www.securityfocus.com/bid/94471

http://www.securitytracker.com/id/1037340

http://xenbits.xen.org/xsa/advisory-191.html

https://security.gentoo.org/glsa/201612-56

https://support.citrix.com/article/CTX218775

Details

Source: MITRE

Published: 2017-01-23

Updated: 2017-07-01

Type: CWE-264

Risk Information

CVSS v2

Base Score: 4.6

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

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 7.8

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

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH

Tenable Plugins

View all (22 total)

IDNameProductFamilySeverity
103830OracleVM 3.4 : xen (OVMSA-2017-0153)NessusOracleVM Local Security Checks
critical
96253openSUSE Security Update : xen (openSUSE-2017-5)NessusSuSE Local Security Checks
high
96252openSUSE Security Update : xen (openSUSE-2017-4)NessusSuSE Local Security Checks
high
96231GLSA-201612-56 : Xen: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
96150SUSE SLES11 Security Update : xen (SUSE-SU-2016:3273-1)NessusSuSE Local Security Checks
high
96032SUSE SLES11 Security Update : xen (SUSE-SU-2016:3174-1)NessusSuSE Local Security Checks
high
95910openSUSE Security Update : xen (openSUSE-2016-1477)NessusSuSE Local Security Checks
high
95822SUSE SLES12 Security Update : xen (SUSE-SU-2016:3156-1)NessusSuSE Local Security Checks
high
95761SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3083-1)NessusSuSE Local Security Checks
high
95709SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2016:3067-1)NessusSuSE Local Security Checks
high
95630Xen Multiple Vulnerabilities (XSA-191 - XSA-198)NessusMisc.
high
95624SUSE SLES11 Security Update : xen (SUSE-SU-2016:3044-1)NessusSuSE Local Security Checks
high
95610Debian DSA-3729-1 : xen - security updateNessusDebian Local Security Checks
high
95539Citrix XenServer Multiple Vulnerabilities (CTX218775)NessusMisc.
high
95505FreeBSD : xen-kernel -- x86 null segments not always treated as unusable (50ac2e96-ba4d-11e6-ae1b-002590263bf5)NessusFreeBSD Local Security Checks
high
95493Fedora 25 : xen (2016-999e1a6927)NessusFedora Local Security Checks
high
95492Fedora 24 : xen (2016-95c104a4c6)NessusFedora Local Security Checks
high
95491Fedora 23 : xen (2016-68b71978a1)NessusFedora Local Security Checks
high
95296Debian DLA-720-1 : xen security updateNessusDebian Local Security Checks
high
95280OracleVM 3.2 : xen (OVMSA-2016-0166)NessusOracleVM Local Security Checks
high
95279OracleVM 3.3 : xen (OVMSA-2016-0165)NessusOracleVM Local Security Checks
high
95278OracleVM 3.4 : xen (OVMSA-2016-0164)NessusOracleVM Local Security Checks
high