Security Update for .NET Core SDK (May 2019) - Nessus

High Plugin ID: 125225

This page contains detailed information about the Security Update for .NET Core SDK (May 2019) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 125225
Name: Security Update for .NET Core SDK (May 2019)
Filename: smb_nt_ms19_may_dotnet_core_sdk.nasl
Vulnerability Published: 2019-05-14
This Plugin Published: 2019-05-16
Last Modification Time: 2021-06-03
Plugin Version: 1.3
Plugin Type: local
Plugin Family: Windows
Dependencies: microsoft_dotnet_core_sdk_win.nbin
Required KB Items [?]: installed_sw/.NET Core SDK Windows, Settings/ParanoidReport

Vulnerability Information

Severity: High
Vulnerability Published: 2019-05-14
Patch Published: 2019-05-14
CVE [?]: CVE-2019-0820, CVE-2019-0980, CVE-2019-0981, CVE-2019-0982
CPE [?]: cpe:/a:microsoft:.net_core

Synopsis

The remote Windows host is affected by a .NET Core SDK vulnerability.

Description

The Microsoft .NET Core SDK installation on the remote host is version 1.x < 1.1.14, 2.1.x < 2.1.507 or 2.1.604, 2.2.x < 2.2.107 or 2.2.204. It is, therefore, affected by a denial of service (DoS) vulnerability when .NET Core improperly handles web requests. An unauthenticated, remote attacker could exploit this issue, via sending a specially crafted requests to the .NET Core application, to cause the application to stop responding.

Solution

Refer to vendor documentation.

Public Exploits

Target Network Port(s): 139, 445
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the Security Update for .NET Core SDK (May 2019) vulnerability:

GitHub: https://github.com/MeterianHQ/api-samples-python
[CVE-2019-0820]
GitHub: https://github.com/snowflakedb/snowflake-connector-net
[CVE-2019-0820]
GitHub: https://github.com/Metalnem/sharpfuzz
[CVE-2019-0980]
GitHub: https://github.com/Metalnem/sharpfuzz
[CVE-2019-0981]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2019-0980
CVSS V2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P/E:U/RL:OF/RC:C

CVSS Base Score:	5.0 (Medium)
Impact Subscore:	2.9
Exploitability Subscore:	10.0
CVSS Temporal Score:	3.7 (Low)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.7 (Low)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

CVSS Base Score:	7.5 (High)
Impact Subscore:	3.6
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.5 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.5 (Medium)

STIG Severity [?]: I
STIG Risk Rating: High

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");

if (description)
{
  script_id(125225);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id(
    "CVE-2019-0820",
    "CVE-2019-0980",
    "CVE-2019-0981",
    "CVE-2019-0982"
  );
  script_bugtraq_id(108245, 108207, 108208);
  script_xref(name:"IAVA", value:"2019-A-0149-S");

  script_name(english:"Security Update for .NET Core SDK (May 2019)");
  script_summary(english:"Checks for Windows Install of .NET Core.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by a .NET Core SDK vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Microsoft .NET Core SDK installation on the remote host is version
1.x < 1.1.14, 2.1.x < 2.1.507 or 2.1.604, 2.2.x < 2.2.107 or 2.2.204.
It is, therefore, affected by a denial of service (DoS) vulnerability when
.NET Core improperly handles web requests. An unauthenticated,
remote attacker could exploit this issue, via sending a specially
crafted requests to the .NET Core application, to cause the
application to stop responding.");
  # https://devblogs.microsoft.com/dotnet/net-core-may-2019/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?75f23c84");
  # https://github.com/dotnet/announcements/issues/111
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bc7b707c");
  # https://github.com/dotnet/announcements/issues/112
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d238d2f5");
  # https://github.com/dotnet/announcements/issues/113
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f495ef09");
  # https://github.com/aspnet/Announcements/issues/359
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cdcee111");
  script_set_attribute(attribute:"solution", value:"Refer to vendor documentation.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-0980");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/05/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/16");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:.net_core");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2019-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("microsoft_dotnet_core_sdk_win.nbin");
  script_require_keys("installed_sw/.NET Core SDK Windows", "Settings/ParanoidReport");
  script_require_ports(139, 445);

  exit(0);
}

include('vcf.inc');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

app = '.NET Core SDK Windows';

app_info = vcf::get_app_info(app:app, win_local:TRUE);

constraints = [
  { 'fixed_version' : '1.1.14' },
  { 'min_version' : '2.1', 'fixed_version' : '2.1.507' },
  { 'min_version' : '2.1.600', 'fixed_version' : '2.1.604'},
  { 'min_version' : '2.2', 'fixed_version' : '2.2.107' },
  { 'min_version' : '2.2.200', 'fixed_version' : '2.2.204'}
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/smb_nt_ms19_may_dotnet_core_sdk.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms19_may_dotnet_core_sdk.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms19_may_dotnet_core_sdk.nasl

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How to Run

Here is how to run the Security Update for .NET Core SDK (May 2019) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Windows plugin family.
On the right side table select Security Update for .NET Core SDK (May 2019) plugin ID 125225.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl smb_nt_ms19_may_dotnet_core_sdk.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a smb_nt_ms19_may_dotnet_core_sdk.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - smb_nt_ms19_may_dotnet_core_sdk.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state smb_nt_ms19_may_dotnet_core_sdk.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

108207, 108208, 108245

IAVA | Information Assurance Vulnerability Alert:

2019-A-0149-S

See also:

Similar and related Nessus plugins:

145596 - CentOS 8 : dotnet (CESA-2019:1259)
127585 - Oracle Linux 8 : dotnet (ELSA-2019-1259)
125322 - RHEL 7 : dotNET (RHSA-2019:1236)
125347 - RHEL 8 : dotnet (RHSA-2019:1259)
125058 - KB4494440: Windows 10 Version 1607 and Windows Server 2016 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125059 - KB4494441: Windows 10 Version 1809 and Windows Server 2019 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125060 - KB4499180: Windows Server 2008 and Windows Vista SP2 May 2019 Security Update (BlueKeep)
125061 - KB4499165: Windows 8.1 and Windows Server 2012 R2 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125062 - KB4499154: Windows 10 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125063 - KB4499175: Windows 7 and Windows Server 2008 R2 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout) (BlueKeep)
125064 - KB4499167: Windows 10 Version 1803 and Windows Server Version 1803 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125065 - KB4499158: Windows Server 2012 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125066 - KB4499179: Windows 10 Version 1709 and Windows Server Version 1709 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125067 - KB4499181: Windows 10 Version 1703 May 2019 Security Update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)
125164 - Security Update for Microsoft ASP.NET Core (DoS) (May 2019)
125217 - Security Update for .NET Core (May 2019)
125074 - Security Updates for Microsoft .NET Framework (May 2019)
125069 - Security Updates for Internet Explorer (May 2019)
125149 - Intel Microcode Updates for Windows 10 / Windows Server 2016 / Windows Server 2019 (May 2019) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms19_may_dotnet_core_sdk.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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Security Update for .NET Core SDK (May 2019) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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