Microsoft Windows Vista SP2 up to Server 2012 R2 Kernel win32k.sys 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.
8.1$5k-$25k0.00

A vulnerability has been found in Microsoft Windows Vista SP2 up to Server 2012 R2 (Operating System) and classified as critical. Affected by this vulnerability is some unknown functionality in the library win32k.sys of the component Kernel. 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.

The weakness was presented 06/14/2016 as MS16-073 as confirmed bulletin (Technet). It is possible to read the advisory at technet.microsoft.com. This vulnerability is known as CVE-2016-3221 since 03/15/2016. The exploitation appears to be easy. The attack can be launched remotely. A single authentication is required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/23/2022). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

Multiple elevation of privilege vulnerabilities exist in Windows when the Windows kernel-mode driver fails to properly handle objects in memory. An attacker who successfully exploited the vulnerabilities could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

The vulnerability scanner Nessus provides a plugin with the ID 91601 (MS16-073: Security Update for Windows Kernel-Mode Drivers (3164028)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91236 (Microsoft Windows Kernel Mode Drivers Elevation of Privilege Vulnerabilities (MS16-073)). The advisory illustrates:

To exploit the vulnerabilities, an attacker would first have to log on to the target system. An attacker could then run a specially crafted application that could exploit the vulnerabilities and take control over an affected system. The update addresses the vulnerabilities by correcting how the Windows kernel-mode driver handles objects in memory.

Applying the patch MS16-073 is able to eliminate this problem. The bugfix is ready for download at technet.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (91601). See 87942 and 87944 for similar entries.

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: 8.3
VulDB Meta Temp Score: 8.1

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
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-264
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 91601
Nessus Name: MS16-073: Security Update for Windows Kernel-Mode Drivers (3164028)
Nessus File: 🔍
Nessus Family: 🔍

OpenVAS ID: 802074
OpenVAS Name: Microsoft Kernel-Mode Drivers Privilege Elevation Vulnerabilities (3164028)
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: 🔍

Patch: MS16-073

Timelineinfo

03/15/2016 🔍
06/14/2016 +91 days 🔍
06/14/2016 +0 days 🔍
06/15/2016 +1 days 🔍
06/16/2016 +1 days 🔍
08/23/2022 +2259 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS16-073
Status: Confirmed

CVE: CVE-2016-3221 (🔍)
OVAL: 🔍

SecurityTracker: 1036109

scip Labs: https://www.scip.ch/en/?labs.20161215
See also: 🔍

Entryinfo

Created: 06/16/2016 16:35
Updated: 08/23/2022 18:49
Changes: 06/16/2016 16:35 (68), 04/07/2017 13:38 (9), 08/23/2022 18:49 (4)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

Might our Artificial Intelligence support you?

Check our Alexa App!