Microsoft Windows 8.1 up to Server 2016 DNSAPI DNSAPI.dll DNS Response access control

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CVSS Meta Temp Score
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7.9$5k-$25k0.00

A vulnerability was found in Microsoft Windows 8.1 up to Server 2016 (Operating System) and classified as critical. Affected by this issue is an unknown function in the library DNSAPI.dll of the component DNSAPI. The manipulation as part of a DNS Response leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-284. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The Microsoft Windows Domain Name System (DNS) DNSAPI.dll on Microsoft Windows 8.1, Windows Server 2012 R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows a remote code execution vulnerability when it fails to properly handle DNS responses, aka "Windows DNSAPI Remote Code Execution Vulnerability".

The bug was discovered 10/10/2017. The weakness was shared 10/10/2017 by Nick Freeman as KB4041690 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. This vulnerability is handled as CVE-2017-11779 since 07/31/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 01/16/2021). The MITRE ATT&CK project declares the attack technique as T1068. The advisory points out:

A remote code execution vulnerability exists in Windows Domain Name System (DNS) DNSAPI.dll when it fails to properly handle DNS responses. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the Local System Account.

The vulnerability scanner Nessus provides a plugin with the ID 103745 (KB4041676: Windows 10 Version 1703 October 2017 Cumulative Update (KRACK)), 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 local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91411 (Microsoft Windows Security Update October 2017 (KRACK Attack) (ROCA)).

Applying the patch KB4041690 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 SecurityFocus (BID 101166), SecurityTracker (ID 1039533) and Tenable (103745). The entries 107699, 107701, 107702 and 107704 are related to this item.

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VulDB Meta Base Score: 8.3
VulDB Meta Temp Score: 7.9

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

Vendor Base Score (Microsoft): 8.1
Vendor Vector (Microsoft): 🔍

NVD Base Score: 8.1
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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍

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Nessus ID: 103745
Nessus Name: KB4041676: Windows 10 Version 1703 October 2017 Cumulative Update (KRACK)
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OpenVAS ID: 802136
OpenVAS Name: Microsoft Windows Multiple Vulnerabilities (KB4042895)
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Countermeasuresinfoedit

Recommended: Patch
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Patch: KB4041690

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07/31/2017 🔍
10/10/2017 +70 days 🔍
10/10/2017 +0 days 🔍
10/10/2017 +0 days 🔍
10/10/2017 +0 days 🔍
10/10/2017 +0 days 🔍
10/11/2017 +1 days 🔍
10/13/2017 +2 days 🔍
01/16/2021 +1191 days 🔍

Sourcesinfoedit

Vendor: https://www.microsoft.com/
Product: https://www.microsoft.com/en-us/windows

Advisory: KB4041690
Researcher: Nick Freeman
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-11779 (🔍)
OVAL: 🔍

SecurityFocus: 101166
SecurityTracker: 1039533

scip Labs: https://www.scip.ch/en/?labs.20161215
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Entryinfoedit

Created: 10/11/2017 11:38 PM
Updated: 01/16/2021 03:17 PM
Changes: (3) advisory_person_name source_securityfocus_date source_securityfocus_class
Complete: 🔍

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