National Vulnerability Database

National Vulnerability Database

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    Vulnerabilities Detail

CVE-2016-3159 Detail

Description

The fpu_fxrstor function in arch/x86/i387.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.

Source:  MITRE
Description Last Modified:  04/13/2016

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 3.8 LOW
Vector: AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N (V3 legend)
Impact Score: 1.4
Exploitability Score: 2.0

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): Low
Integrity (I): None
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 1.7 LOW
Vector: (AV:L/AC:L/Au:S/C:P/I:N/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 3.1

Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): Partial
Integrity (I): None
Availability (A): None
Additional Information:
Allows unauthorized disclosure of information

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html Third Party Advisory
http://support.citrix.com/article/CTX209443
http://www.debian.org/security/2016/dsa-3554
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html Vendor Advisory
http://www.securityfocus.com/bid/85716 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1035435 Third Party Advisory VDB Entry
http://xenbits.xen.org/xsa/advisory-172.html Patch Vendor Advisory
http://xenbits.xen.org/xsa/xsa172.patch Patch

Technical Details

Vulnerability Type (View All)

  • Information Leak / Disclosure (CWE-200)
  • Improper Access Control (CWE-284)

Change History

5 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2016-3159
NVD Published Date:
04/13/2016
NVD Last Modified:
12/02/2016