Xen Array access control

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Xen. This affects an unknown function of the component Array Handler. Executing a manipulation can lead to access control. This vulnerability is registered as CVE-2016-9637. The attack needs to be launched locally. No exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability classified as critical was found in Xen (Virtualization Software) (affected version not known). This vulnerability affects some unknown functionality of the component Array Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest OS administrators to gain qemu process privileges via vectors involving an out-of-range ioport access.

The bug was discovered 12/06/2016. The weakness was published 12/06/2016 by yanghongke with Huawei as XSA-199 as confirmed security advisory (Website). The advisory is available at xenbits.xen.org. The public release has been coordinated with the vendor. This vulnerability was named CVE-2016-9637 since 11/23/2016. Local access is required to approach this attack. A single authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project. The advisory points out:

The code in qemu which implements ioport read/write looks up the specified ioport address in a dispatch table. The argument to the dispatch function is a uint32_t, and is used without a range check, even though the table has entries for only 2^16 ioports.

The vulnerability scanner Nessus provides a plugin with the ID 900047 , which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169439 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2016:3174-1)).

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 (900047), SecurityFocus (BID 94699†) and SecurityTracker (ID 1037397†). Similar entries are available at VDB-92454, VDB-92455, VDB-92462 and VDB-93307. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
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: Access control
CWE: CWE-264
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: 900047
Nessus File: 🔍

OpenVAS ID: 54740
OpenVAS Name: CentOS Update for xen CESA-2016:2963 centos5
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

11/23/2016 🔍
12/06/2016 +13 days 🔍
12/06/2016 +0 days 🔍
12/06/2016 +0 days 🔍
12/06/2016 +0 days 🔍
12/06/2016 +0 days 🔍
12/07/2016 +1 days 🔍
02/16/2017 +71 days 🔍
06/19/2019 +853 days 🔍

Sourcesinfo

Advisory: XSA-199
Researcher: yanghongke
Organization: Huawei
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-9637 (🔍)
GCVE (CVE): GCVE-0-2016-9637
GCVE (VulDB): GCVE-100-93970
SecurityFocus: 94699 - Xen CVE-2016-9637 Privilege Escalation Vulnerability
SecurityTracker: 1037397

See also: 🔍

Entryinfo

Created: 12/07/2016 10:36
Updated: 06/19/2019 17:31
Changes: 12/07/2016 10:36 (68), 06/19/2019 17:31 (14)
Complete: 🔍
Cache ID: 216:D39:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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