Microsoft Windows up to Server 2016 Kernel 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.
6.5	$0-$5k	0.00

A vulnerability classified as critical was found in Microsoft Windows up to Server 2016 (Operating System). Affected by this vulnerability is an unknown function 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 summary by CVE is:

The Windows kernel in Windows 8.1 and RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703 and 1709, Windows Server 2016 and Windows Server, version 1709 allows an elevation of privilege vulnerability due to the way objects are handled in memory, aka "Windows Elevation of Privilege Vulnerability".

The bug was discovered 01/03/2018. The weakness was shared 01/03/2018 by Tavis Ormandy with Google Project Zero as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. This vulnerability is known as CVE-2018-0744 since 12/01/2017. An attack has to be approached locally. The successful exploitation requires a single authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue. The advisory points out:

An elevation of privilege vulnerability exists when the Windows kernel fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability 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.

A public exploit has been developed by Google Security Research in ANSI C and been published 2 days after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 105547 (KB4056888: Windows 10 Version 1511 January 2018 Security Update (Meltdown)(Spectre)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91423 (Microsoft Windows Security Update (ADV180002) (Spectre/Meltdown)). The code used by the exploit is:

WNDCLASSEX WindowClass = {0};
HWND WindowA, WindowB, WindowC;
ATOM Atom;

WindowClass.cbSize         = sizeof(WNDCLASSEX);
WindowClass.lpfnWndProc    = DefWindowProc;
WindowClass.lpszClassName  = "Class";

Atom = RegisterClassEx(&WindowClass);
WindowA = CreateWindowEx(0, MAKEINTATOM(Atom), "One", 0, CW_USEDEFAULT, 0, 128, 128, NULL, NULL, NULL, NULL);
SetClassLong(WindowA, GCL_STYLE, CS_CLASSDC);
WindowB = CreateWindowEx(0, MAKEINTATOM(Atom), "Two", 0, CW_USEDEFAULT, 0, 128, 128, NULL, NULL, NULL, NULL);
GetDC(WindowA);
SetClassLong(WindowA, GCL_STYLE, CS_CLASSDC | CS_OWNDC);
WindowC = CreateWindowEx(0, MAKEINTATOM(Atom), "Three", 0, CW_USEDEFAULT, 0, 128, 128, NULL, NULL, NULL, NULL);

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 (105547) and Exploit-DB (43446). The entries 111347, 111348, 111350 and 111351 are related to this item.

Productinfo

Type

Operating System

Vendor

Microsoft

Name

Windows

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 7.0
Vendor Vector (Microsoft): 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
ATT&CK: T1068

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Google Security Research
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 105547
Nessus Name: KB4056888: Windows 10 Version 1511 January 2018 Security Update (Meltdown)(Spectre)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 870324
OpenVAS Name: Microsoft Windows Multiple Vulnerabilities (KB4056892)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

12/01/2017 🔍
01/03/2018 +33 days 🔍
01/03/2018 +0 days 🔍
01/03/2018 +0 days 🔍
01/03/2018 +0 days 🔍
01/04/2018 +1 days 🔍
01/04/2018 +0 days 🔍
01/05/2018 +1 days 🔍
01/05/2018 +0 days 🔍
01/05/2018 +0 days 🔍
01/28/2021 +1119 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: portal.msrc.microsoft.com
Researcher: Tavis Ormandy
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0744 (🔍)
OVAL: 🔍

SecurityTracker: 1040090
SecurityFocus: 102351 - Microsoft Windows Kernel CVE-2018-0744 Local Privilege Escalation Vulnerability

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

Entryinfo

Created: 01/05/2018 09:59
Updated: 01/28/2021 13:35
Changes: 01/05/2018 09:59 (99), 06/06/2020 11:42 (6), 01/28/2021 13:35 (3)
Complete: 🔍

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