XenSource Xen 4.3.x/4.4.x/4.5.x/4.6.x VMX Intercept code

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in XenSource Xen 4.3.x/4.4.x/4.5.x/4.6.x. This affects an unknown part of the component VMX Intercept Handler. The manipulation leads to denial of service. This vulnerability is uniquely identified as CVE-2016-1571. The attack is possible to be carried out remotely. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in XenSource Xen 4.3.x/4.4.x/4.5.x/4.6.x (Virtualization Software) and classified as critical. This issue affects an unknown code of the component VMX Intercept Handler. The manipulation with an unknown input leads to a code vulnerability. Using CWE to declare the problem leads to CWE-17. Impacted is confidentiality, and availability.

The weakness was disclosed 01/20/2016 by Jan Beulich with SuSE as XSA-168 as confirmed security advisory (Website). The advisory is shared at xenbits.xen.org. The identification of this vulnerability is CVE-2016-1571 since 01/11/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

While INVLPG does not cause a General Protection Fault when used on a non-canonical address, INVVPID in its "individual address" variant, which is used to back the intercepted INVLPG in certain cases, fails in such cases. Failure of INVVPID results in a hypervisor bug check.

The vulnerability scanner Nessus provides a plugin with the ID 88170 (OracleVM 3.3 : xen (OVMSA-2016-0007)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175674 (Debian Security Update for xen (DSA 3519-1)).

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 (88170), SecurityTracker (ID 1034745†) and Vulnerability Center (SBV-56025†). The entries VDB-80356 and VDB-81024 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 8.6
VulDB Temp Score: 8.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.3
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Code
CWE: CWE-17
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 88170
Nessus Name: OracleVM 3.3 : xen (OVMSA-2016-0007)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for xen FEDORA-2016-2
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

01/11/2016 🔍
01/20/2016 +9 days 🔍
01/20/2016 +0 days 🔍
01/20/2016 +0 days 🔍
01/20/2016 +0 days 🔍
01/21/2016 +1 days 🔍
01/21/2016 +0 days 🔍
01/22/2016 +1 days 🔍
01/26/2016 +4 days 🔍
07/04/2022 +2351 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-168
Researcher: Jan Beulich
Organization: SuSE
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-1571 (🔍)
GCVE (CVE): GCVE-0-2016-1571
GCVE (VulDB): GCVE-100-80357

OVAL: 🔍

SecurityTracker: 1034745
Vulnerability Center: 56025 - Xen 3.3 - 4.6 Local DoS or Code Execution due to an Issue in INVVPID, Medium

See also: 🔍

Entryinfo

Created: 01/21/2016 11:29
Updated: 07/04/2022 06:21
Changes: 01/21/2016 11:29 (67), 07/02/2018 09:18 (21), 07/04/2022 06:21 (3)
Complete: 🔍
Cache ID: 216:0BC:103

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