Microsoft Windows up to Server 2012 R2 win32k.sys win32k!NtGdiGetTextMetricsW Kernel Memory information disclosure

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.
4.9$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Microsoft Windows up to Server 2012 R2. This impacts the function win32k!NtGdiGetTextMetricsW in the library win32k.sys. The manipulation leads to information disclosure (Kernel Memory). This vulnerability is traded as CVE-2017-8472. An attack has to be approached locally. Furthermore, there is an exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Microsoft Windows up to Server 2012 R2 (Operating System). It has been rated as problematic. This issue affects the function win32k!NtGdiGetTextMetricsW in the library win32k.sys. The manipulation with an unknown input leads to a information disclosure vulnerability (Kernel Memory). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality.

The bug was discovered 06/13/2017. The weakness was shared 06/13/2017 by Mateusz Jurczyk with Google Project Zero as KB4022887 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The identification of this vulnerability is CVE-2017-8472 since 05/03/2017. Attacking locally is a requirement. A simple authentication is required for exploitation. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK. The advisory points out:

An information disclosure vulnerability exists when the Windows kernel improperly initializes objects in memory. To exploit this vulnerability, an authenticated attacker could run a specially crafted application. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system. The update addresses the vulnerability by correcting how the Windows kernel initializes objects in memory.

A public exploit has been developed by Google Security Research in C++ and been published 2 weeks after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 100761 (Windows 7 and Windows Server 2008 R2 June 2017 Security Updates), 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 91385 (Microsoft Windows Security Update June 2017).

Applying the patch KB4022887 is able to eliminate this problem. The bugfix is ready for download at catalog.update.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (42225), Tenable (100761) and SecurityFocus (BID 98851†). The entries VDB-102386, VDB-102396, VDB-102401 and VDB-102416 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 4.9

VulDB Base Score: 5.5
VulDB Temp Score: 5.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 4.7
Vendor Vector (Microsoft): 🔍

NVD Base Score: 5.0
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Name: Kernel Memory
Class: Information disclosure / Kernel Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 100761
Nessus Name: Windows 7 and Windows Server 2008 R2 June 2017 Security Updates
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802136
OpenVAS Name: Microsoft Windows Multiple Vulnerabilites (KB4022719)
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: 🔍

Patch: KB4022887

Timelineinfo

05/03/2017 🔍
06/13/2017 +41 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/14/2017 +1 days 🔍
06/14/2017 +0 days 🔍
06/22/2017 +8 days 🔍
06/22/2017 +0 days 🔍
08/21/2024 +2617 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: KB4022887
Researcher: Mateusz Jurczyk
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8472 (🔍)
GCVE (CVE): GCVE-0-2017-8472
GCVE (VulDB): GCVE-100-102419

OVAL: 🔍

SecurityFocus: 98851 - Microsoft Windows Kernel 'Win32k.sys' CVE-2017-8472 Local Information Disclosure Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20140213
See also: 🔍

Entryinfo

Created: 06/14/2017 11:18
Updated: 08/21/2024 08:04
Changes: 06/14/2017 11:18 (98), 10/19/2019 21:01 (7), 12/28/2020 08:52 (2), 08/21/2024 08:04 (17)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!