Microsoft Windows up to Server 2012 R2 GDI+ win32k!NtGdiGetFontResourceInfoInternalW information disclosure

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5.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft Windows up to Server 2012 R2. It has been declared as problematic. Affected is the function win32k!NtGdiGetFontResourceInfoInternalW of the component GDI+. Such manipulation leads to information disclosure. This vulnerability is referenced as CVE-2017-8684. The attack can only be performed from a local environment. Furthermore, an exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Microsoft Windows up to Server 2012 R2 (Operating System). Affected by this issue is the function win32k!NtGdiGetFontResourceInfoInternalW of the component GDI+. The manipulation with an unknown input leads to a information disclosure vulnerability. 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. CVE summarizes:

Windows GDI+ on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT 8.1, allows information disclosure by the way it discloses kernel memory addresses, aka "Windows GDI+ Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8685 and CVE-2017-8688.

The bug was discovered 09/12/2017. The weakness was published 09/12/2017 by Mateusz Jurczyk with Google Project Zero as KB4038792 as confirmed security update guide (Website). The advisory is available at portal.msrc.microsoft.com. This vulnerability is handled as CVE-2017-8684 since 05/03/2017. Local access is required to approach this attack. Required for exploitation is a simple authentication. Technical details as well as a public exploit are known. This vulnerability is assigned to T1592 by the MITRE ATT&CK project. The advisory points out:

A information disclosure vulnerability exists when the Windows GDI+ component improperly discloses kernel memory addresses. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.

A public exploit has been developed by Google Security Research and been published 6 days after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 103127 (Windows 7 and Windows Server 2008 R2 September 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 91408 (Microsoft Windows Security Update September 2017).

Applying the patch KB4038792 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 (42747), Tenable (103127) and SecurityFocus (BID 100782†). Similar entries are available at VDB-89035, VDB-106482, VDB-106502 and VDB-106454. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

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

Vendor Base Score (Microsoft): 5.5
Vendor Vector (Microsoft): 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

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

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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 103127
Nessus Name: Windows 7 and Windows Server 2008 R2 September 2017 Security Updates
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802136
OpenVAS Name: Microsoft Windows Multiple Vulnerabilites (KB4039384)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
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Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
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Patch: KB4038792

Timelineinfo

05/03/2017 🔍
09/12/2017 +132 days 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/12/2017 +0 days 🔍
09/13/2017 +1 days 🔍
09/18/2017 +5 days 🔍
09/18/2017 +0 days 🔍
01/12/2021 +1212 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: KB4038792
Researcher: Mateusz Jurczyk
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8684 (🔍)
GCVE (CVE): GCVE-0-2017-8684
GCVE (VulDB): GCVE-100-106490

OVAL: 🔍

SecurityFocus: 100782 - Microsoft Windows GDI+ Component CVE-2017-8684 Local Information Disclosure Vulnerability
SecurityTracker: 1039338

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

Entryinfo

Created: 09/13/2017 13:18
Updated: 01/12/2021 07:01
Changes: 09/13/2017 13:18 (99), 06/06/2020 09:47 (7), 01/12/2021 07:01 (2)
Complete: 🔍
Cache ID: 216::103

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

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