CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS
Percentile
54.0%
The Microsoft .NET Core installation on the remote host is version 3.1.x prior to 3.1.16, 5.x prior to 5.0.7. It is, therefore, affected by a denial of service vulnerability. 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.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(150708);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/09");
script_cve_id("CVE-2021-1721");
script_name(english:"Security Update for .NET Core (June 2021)");
script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by a .NET Core denial of service (DoS) vulnerability.");
script_set_attribute(attribute:"description", value:
"The Microsoft .NET Core installation on the remote host is version 3.1.x prior to 3.1.16, 5.x prior to 5.0.7.
It is, therefore, affected by a denial of service vulnerability. 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.");
script_set_attribute(attribute:"see_also", value:"https://dotnet.microsoft.com/download/dotnet-core/3.1");
script_set_attribute(attribute:"see_also", value:"https://dotnet.microsoft.com/download/dotnet/5.0");
# https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.16/3.1.16.md
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cf839a13");
# https://github.com/dotnet/core/blob/main/release-notes/5.0/5.0.7/5.0.7.md
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1c41b94c");
script_set_attribute(attribute:"solution", value:
"Update .NET Core, remove vulnerable packages and refer to vendor advisory.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:R/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-2021-1721");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/08");
script_set_attribute(attribute:"patch_publication_date", value:"2021/06/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/11");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:.net_core");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows");
script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("microsoft_dotnet_core_win.nbin");
script_require_keys("installed_sw/.NET Core Windows");
exit(0);
}
include('vcf.inc');
var app = '.NET Core Windows';
var app_info = vcf::get_app_info(app:app, win_local:TRUE);
var constraints = [
{ 'min_version' : '3.1', 'fixed_version' : '3.1.16' },
{ 'min_version' : '5.0', 'fixed_version' : '5.0.7' },
];
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS
Percentile
54.0%