CVE-2016-7777

medium
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

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

References

http://www.securityfocus.com/bid/93344

http://www.securitytracker.com/id/1036942

http://xenbits.xen.org/xsa/advisory-190.html

https://security.gentoo.org/glsa/201611-09

https://support.citrix.com/article/CTX217363

Details

Source: MITRE

Published: 2016-10-07

Updated: 2017-07-01

Type: CWE-362

Risk Information

CVSS v2

Base Score: 3.3

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

Impact Score: 4.9

Exploitability Score: 3.4

Severity: LOW

CVSS v3

Base Score: 6.3

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

Impact Score: 5.2

Exploitability Score: 1

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions up to 4.7.0 (inclusive)

Tenable Plugins

View all (21 total)

IDNameProductFamilySeverity
140019OracleVM 3.4 : xen (OVMSA-2020-0039) (Bunker Buster) (Foreshadow) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout) (Meltdown) (POODLE) (Spectre)NessusOracleVM Local Security Checks
critical
111992OracleVM 3.4 : xen (OVMSA-2018-0248) (Bunker Buster) (Foreshadow) (Meltdown) (POODLE) (Spectre)NessusOracleVM Local Security Checks
critical
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
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
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
95504FreeBSD : xen-kernel -- CR0.TS and CR0.EM not always honored for x86 HVM guests (4d7cf654-ba4d-11e6-ae1b-002590263bf5)NessusFreeBSD Local Security Checks
medium
95278OracleVM 3.4 : xen (OVMSA-2016-0164)NessusOracleVM Local Security Checks
high
94893GLSA-201611-09 : Xen: Multiple vulnerabilities (Bunker Buster)NessusGentoo Local Security Checks
high
94827Fedora 25 : xen (2016-81e5a36d8c)NessusFedora Local Security Checks
critical
94520Debian DLA-699-1 : xen security updateNessusDebian Local Security Checks
medium
94162Xen x86 CR0.TS and CR0.EM Honoring Cross-task Register State Information Disclosure (XSA-190)NessusMisc.
medium
94059Fedora 23 : xen (2016-689f240960)NessusFedora Local Security Checks
critical
94058Fedora 24 : xen (2016-4c407cd849)NessusFedora Local Security Checks
critical