CVE-2016-3158

Severity Score

3.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.

La función xrstor en arch/x86/xstate.c en Xen 4.x no maneja correctamente escrituras al bit FSW.ES hardware cuando se ejecuta en procesadores AMD64, lo que permite a usuarios locales del SO invitado obtener información sensible del contenido de registro de otro invitado aprovechando una excepción pendiente y bits de máscara. NOTA: esta vulnerabilidad existe por una solución incorrecta para CVE-2013-2076.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-03-15 CVE Reserved
2016-04-13 CVE Published
2024-08-05 CVE Updated
2024-09-26 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-284: Improper Access Control

CAPEC

References (10)

URL	Tag	Source
http://support.citrix.com/article/CTX209443	X_refsource_confirm
http://www.securityfocus.com/bid/85714	Third Party Advisory
http://www.securitytracker.com/id/1035435	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://xenbits.xen.org/xsa/xsa172-4.3.patch	2016-12-03
http://xenbits.xen.org/xsa/xsa172.patch	2016-12-03

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html	2016-12-03
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html	2016-12-03
http://www.debian.org/security/2016/dsa-3554	2016-12-03
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html	2016-12-03
http://xenbits.xen.org/xsa/advisory-172.html	2016-12-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				<= 4.4.0 Search vendor "Xen" for product "Xen" and version " <= 4.4.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				22 Search vendor "Fedoraproject" for product "Fedora" and version "22"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				23 Search vendor "Fedoraproject" for product "Fedora" and version "23"		-		Affected
Oracle Search vendor "Oracle"		Vm Server Search vendor "Oracle" for product "Vm Server"				3.3 Search vendor "Oracle" for product "Vm Server" and version "3.3"		-		Affected
Oracle Search vendor "Oracle"		Vm Server Search vendor "Oracle" for product "Vm Server"				3.4 Search vendor "Oracle" for product "Vm Server" and version "3.4"		-		Affected