XenSource Xen 4.3/4.4/4.5/4.6 Qemu VGA Module access control

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.2$0-$5k0.00

A vulnerability, which was classified as critical, has been found in XenSource Xen 4.3/4.4/4.5/4.6 (Virtualization Software). This issue affects some unknown functionality of the component Qemu VGA Module. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The VGA module in QEMU improperly performs bounds checking on banked access to video memory, which allows local guest OS users to execute arbitrary code on the host by changing access modes after setting the bank register, aka the "Dark Portal" issue.

The weakness was released 05/09/2016 by Qinghao Tang with 360 Marvel Team as XSA-179 as confirmed security advisory (Website). It is possible to read the advisory at xenbits.xen.org. The identification of this vulnerability is CVE-2016-3710 since 03/30/2016. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 91038 (RHEL 6 : qemu-kvm (RHSA-2016:0997)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196471 (Ubuntu Security Notification for Qemu, Qemu-kvm Vulnerabilities (USN-2974-1)).

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 X-Force (113038) and Tenable (91038). Entry connected to this vulnerability is available at 87132.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.2

VulDB Base Score: 8.8
VulDB Temp Score: 7.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
ATT&CK: T1068

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 91038
Nessus Name: RHEL 6 : qemu-kvm (RHSA-2016:0997)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867562
OpenVAS Name: CentOS Update for libcacard CESA-2016:0724 centos7
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

03/30/2016 🔍
05/09/2016 +40 days 🔍
05/09/2016 +0 days 🔍
05/09/2016 +0 days 🔍
05/10/2016 +1 days 🔍
05/11/2016 +1 days 🔍
05/11/2016 +0 days 🔍
08/18/2022 +2290 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-179
Researcher: Qinghao Tang
Organization: 360 Marvel Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-3710 (🔍)
OVAL: 🔍

X-Force: 113038 - Xen Qemu VGA module privilege escalation
SecurityTracker: 1035794
SecurityFocus: 90316 - QEMU CVE-2016-3710 Remote Code Execution Vulnerability

See also: 🔍

Entryinfo

Created: 05/10/2016 10:39
Updated: 08/18/2022 07:03
Changes: 05/10/2016 10:39 (72), 11/23/2018 10:46 (13), 08/18/2022 07:03 (3)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!