Microsoft .NET Core 2.1 input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

A vulnerability was found in Microsoft .NET Core 2.1. It has been rated as critical. This issue affects some unknown processing. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A tampering vulnerability exists when .NET Core improperly handles specially crafted files, aka ".NET Core Tampering Vulnerability." This affects .NET Core 2.1.

The bug was discovered 11/13/2018. The weakness was published 11/13/2018 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The public release has been coordinated with Microsoft. The identification of this vulnerability is CVE-2018-8416 since 03/14/2018. The attack may be initiated remotely. Required for exploitation is a simple authentication. The technical details are unknown and an exploit is not publicly available. The advisory points out:

A tampering vulnerability exists when .NET Core improperly handles specially crafted files. An attacker who successfully exploited this vulnerability could write arbitrary files and directories to certain locations on a vulnerable system. However, an attacker would have limited control over the destination of the files and directories.

The vulnerability scanner Nessus provides a plugin with the ID 118979 (Security Update for .NET Core (November 2018)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371584 (PowerShell Core Multiple .NET Vulnerabilities).

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 (118979) and SecurityFocus (BID 105798†). Similar entries are available at VDB-128734 and VDB-128747.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
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NVD Base Score: 6.5
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CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

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

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 118979
Nessus Name: Security Update for .NET Core (November 2018)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Timelineinfo

03/14/2018 🔍
11/13/2018 +244 days 🔍
11/13/2018 +0 days 🔍
11/13/2018 +0 days 🔍
11/13/2018 +0 days 🔍
11/13/2018 +0 days 🔍
11/14/2018 +1 days 🔍
11/16/2018 +2 days 🔍
06/06/2023 +1663 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: RHSA-2018:3676
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2018-8416 (🔍)
SecurityFocus: 105798 - Microsoft .NET Core CVE-2018-8416 Tampering Security Bypass Vulnerability
SecurityTracker: 1042128

See also: 🔍

Entryinfo

Created: 11/14/2018 09:58 AM
Updated: 06/06/2023 09:21 AM
Changes: 11/14/2018 09:58 AM (74), 04/12/2020 11:53 AM (5), 06/06/2023 09:21 AM (5)
Complete: 🔍
Cache ID: 18:120:40

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