Detections
Analytics
Security Update for .NET Core (February 2021)
medium Nessus Plugin ID 146328
Language:
Synopsis
The remote Windows host is affected by a .NET Core denial of service (DoS) vulnerability.Description
The Microsoft .NET Core installation on the remote host is version 2.1.x prior to 2.1.25, 3.1.x prior to 3.1.126, or 5.x prior to 5.0.3. It is, therefore, affected by a denial of service vulnerability when creating HTTPS web requests during X509 certificate chain building. An unauthenticated, remote attacker can exploit this to cause the application to stop responding.Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update .NET Core, remove vulnerable packages and refer to vendor advisory.See Also
https://dotnet.microsoft.com/download/dotnet-core/3.1
https://dotnet.microsoft.com/download/dotnet/5.0
https://github.com/dotnet/announcements/issues/175
http://www.nessus.org/u?2455d834
http://www.nessus.org/u?a75f459e
Plugin Details
Severity: Medium
ID: 146328
File Name: smb_nt_ms21_feb_dotnet_core.nasl
Version: 1.4
Type: local
Agent: windows
Family: Windows
Published: 2/9/2021
Updated: 6/11/2021
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.2
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2021-1721
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:microsoft:.net_core
Required KB Items: installed_sw/.NET Core Windows
Exploit Ease: No known exploits are available
Patch Publication Date: 2/9/2021
Vulnerability Publication Date: 2/9/2021
Reference Information
CVE: CVE-2021-1721
IAVA: 2021-A-0091-S