Security Update for Microsoft ASP.NET Core (January 2020)

high Nessus Plugin ID 133049
New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it is different from CVSS.

VPR Score: 5.9

Synopsis

The Microsoft ASP.NET Core installations on the remote host contain vulnerable packages.

Description

The Microsoft ASP.NET Core installation on the remote host is version 2.1.x < 2.1.15, 3.0.x < 3.0.2, or 3.1.x < 3.1.1.
It is, therefore, affected by multiple vulnerabilities:

- A denial of service vulnerability exists when ASP.NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against an ASP.NET Core web application.
The vulnerability can be exploited remotely, without authentication. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the ASP.NET Core application. (CVE-2020-0602)

- A remote code execution vulnerability exists in ASP.NET Core software when the software fails to handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the 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. (CVE-2020-0603)

Solution

Update ASP.NET Core, remove vulnerable packages and refer to vendor advisory.

See Also

http://www.nessus.org/u?530ba67f

http://www.nessus.org/u?374d2043

https://github.com/aspnet/Announcements/issues/402

https://github.com/aspnet/Announcements/issues/403

https://github.com/dotnet/aspnetcore/issues/18336

https://github.com/dotnet/aspnetcore/issues/18337

Plugin Details

Severity: High

ID: 133049

File Name: smb_nt_ms20_jan_aspdotnet_core.nasl

Version: 1.2

Type: local

Agent: windows

Family: Windows

Published: 1/17/2020

Updated: 1/20/2020

Dependencies: microsoft_asp_dotnet_core_win.nbin

Risk Information

Risk Factor: High

VPR Score: 5.9

CVSS Score Source: CVE-2020-0603

CVSS v2.0

Base Score: 9.3

Temporal Score: 6.9

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:aspnet_core

Required KB Items: installed_sw/ASP .NET Core Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 1/14/2020

Vulnerability Publication Date: 1/14/2020

Reference Information

CVE: CVE-2020-0602, CVE-2020-0603

IAVA: 2020-A-0027