Xen 4.4.x/4.5.x/4.6.x/4.7.x CMPXCHG16B Emulation information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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3.5$0-$5k0.00

Summaryinfo

A vulnerability has been found in Xen 4.4.x/4.5.x/4.6.x/4.7.x and classified as problematic. This affects an unknown part of the component CMPXCHG16B Emulation. Performing a manipulation results in information disclosure. This vulnerability was named CVE-2016-9932. The attack needs to be approached locally. There is no available exploit. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Xen 4.4.x/4.5.x/4.6.x/4.7.x (Virtualization Software). This affects an unknown part of the component CMPXCHG16B Emulation. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

CMPXCHG8B emulation in Xen 3.3.x through 4.7.x on x86 systems allows local HVM guest OS users to obtain sensitive information from host stack memory via a "supposedly-ignored" operand size prefix.

The bug was discovered 12/13/2016. The weakness was presented 12/13/2016 by Jan Beulich with SuSE as XSA-200 as confirmed security advisory (Website). It is possible to read the advisory at xenbits.xen.org. The public release was coordinated in cooperation with the project team. This vulnerability is uniquely identified as CVE-2016-9932 since 12/12/2016. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 95787 (FreeBSD : xen-kernel -- x86 CMPXCHG8B emulation fails to ignore operand size override (80a897a2-c1a6-11e6-ae1b-002590263bf5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169446 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2016:3207-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95787), SecurityFocus (BID 94863†) and SecurityTracker (ID 1037468†). See VDB-94629 for similar entry. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.6
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 95787
Nessus Name: FreeBSD : xen-kernel -- x86 CMPXCHG8B emulation fails to ignore operand size override (80a897a2-c1a6-11e6-ae1b-002590263bf5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 865785
OpenVAS Name: Fedora Update for xen FEDORA-2016-1b868c23a9
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

12/12/2016 🔍
12/13/2016 +1 days 🔍
12/13/2016 +0 days 🔍
12/13/2016 +0 days 🔍
12/13/2016 +0 days 🔍
12/14/2016 +1 days 🔍
12/14/2016 +0 days 🔍
12/15/2016 +1 days 🔍
01/26/2017 +42 days 🔍
05/14/2026 +3395 days 🔍

Sourcesinfo

Advisory: XSA-200
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-9932 (🔍)
GCVE (CVE): GCVE-0-2016-9932
GCVE (VulDB): GCVE-100-94503

OVAL: 🔍

SecurityFocus: 94863 - Xen CVE-2016-9932 Information Disclosure Vulnerability
SecurityTracker: 1037468

See also: 🔍

Entryinfo

Created: 12/15/2016 10:54
Updated: 05/14/2026 23:43
Changes: 12/15/2016 10:54 (78), 07/08/2019 09:51 (10), 05/14/2026 23:43 (16)
Complete: 🔍
Cache ID: 216::103

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