Microsoft .NET Core Hash Collision input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

A vulnerability was found in Microsoft .NET Core (version now known). It has been rated as critical. This issue affects some unknown processing of the component Hash Handler. The manipulation with an unknown input leads to a input validation vulnerability (Collision). 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:

.NET Core 1.0, .NET Core 1.1, NET Core 2.0 and PowerShell Core 6.0.0 allow a denial of Service vulnerability due to how specially crafted requests are handled, aka ".NET Core Denial of Service Vulnerability".

The bug was discovered 03/13/2018. The weakness was presented 03/13/2018 as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. The identification of this vulnerability is CVE-2018-0875 since 12/01/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

A denial of service vulnerability exists in the way that .NET Core handles specially crafted requests, causing a hash collision.

The vulnerability scanner Nessus provides a plugin with the ID 108395 (RHEL 7 : .NET Core on Red Hat Enterprise Linux (RHSA-2018:0522)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370820 (Microsoft .NET CORE Hash Collision Denial Of Service Vulnerability March 2018).

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 vulnerability database at Tenable (108395).

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
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NVD Base Score: 7.5
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CVSSv2info

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Exploitinginfo

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

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 108395
Nessus Name: RHEL 7 : .NET Core on Red Hat Enterprise Linux (RHSA-2018:0522)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 830465
OpenVAS Name: Microsoft PowerShell Core Denial of Service Vulnerability (Linux)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Timelineinfo

12/01/2017 🔍
03/13/2018 +102 days 🔍
03/13/2018 +0 days 🔍
03/13/2018 +0 days 🔍
03/13/2018 +0 days 🔍
03/14/2018 +1 days 🔍
03/14/2018 +0 days 🔍
03/16/2018 +2 days 🔍
02/21/2023 +1803 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: RHSA-2018:0522
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0875 (🔍)
OVAL: 🔍

SecurityTracker: 1040505
SecurityFocus: 103225 - Microsoft .NET CVE-2018-0875 Denial Of Service Vulnerability

Entryinfo

Created: 03/14/2018 11:15
Updated: 02/21/2023 19:17
Changes: 03/14/2018 11:15 (77), 01/13/2020 13:22 (5), 02/04/2021 18:27 (2), 02/21/2023 19:17 (3)
Complete: 🔍

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