Microsoft .NET Framework up to 4.7 input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft .NET Framework up to 4.7. It has been classified as critical. Affected is an unknown function. Performing a manipulation results in input validation. This vulnerability is known as CVE-2017-8759. Remote exploitation of the attack is possible. Furthermore, an exploit is available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Microsoft .NET Framework up to 4.7 (Programming Language Software). This affects an unknown code block. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Microsoft .NET Framework 2.0, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 allow an attacker to execute code remotely via a malicious document or application, aka ".NET Framework Remote Code Execution Vulnerability."

The bug was discovered 09/12/2017. The weakness was published 09/12/2017 by Alex with FireEye, Inc. as KB4040973 as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. This vulnerability is uniquely identified as CVE-2017-8759 since 05/03/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. The advisory points out:

A remote code execution vulnerability exists when Microsoft .NET Framework processes untrusted input. An attacker who successfully exploited this vulnerability in software using the .NET framework could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

A public exploit has been developed by Voulnet and been published 1 days after the advisory. The exploit is shared for download at exploit-db.com. It is declared as attacked. We expect the 0-day to have been worth approximately $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 91410 (Microsoft .NET Framework Security Update September 2017). The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Applying the patch KB4040973 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 (42711), Zero-Day.cz (476), Tenable (103127) and SecurityFocus (BID 100742†). Further details are available at youtube.com. Similar entries are available at VDB-106502, VDB-106454, VDB-106472 and VDB-106481. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Attacked
Author: Voulnet
Download: 🔍

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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: 103306
OpenVAS Name: Microsoft .NET Framework Remote Code Execution Vulnerability (KB4041086)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
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Exploit-DB: 🔍
Zero-Day.cz: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Patch: KB4040973
Suricata ID: 2024702
Suricata Class: 🔍
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Timelineinfo

05/03/2017 🔍
09/12/2017 +132 days 🔍
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09/13/2017 +1 days 🔍
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09/13/2017 +0 days 🔍
09/09/2024 +2553 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: KB4040973
Researcher: Alex Berry, Dhanesh Kizhakkinan (Alex)
Organization: FireEye, Inc.
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8759 (🔍)
GCVE (CVE): GCVE-0-2017-8759
GCVE (VulDB): GCVE-100-106545

OVAL: 🔍

SecurityFocus: 100742 - Microsoft Windows .NET Framework CVE-2017-8759 Remote Code Execution Vulnerability
SecurityTracker: 1039324

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 09/13/2017 14:41
Updated: 09/09/2024 22:29
Changes: 09/13/2017 14:41 (98), 12/17/2019 19:29 (3), 01/12/2021 14:05 (3), 01/12/2021 14:08 (1), 04/19/2024 10:48 (28), 07/05/2024 18:35 (2), 07/24/2024 21:16 (1), 09/09/2024 22:29 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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