CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
58.3%
ASP.NET Core is prone to a denial of service vulnerability.
# SPDX-FileCopyrightText: 2021 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only
CPE = "cpe:/a:microsoft:asp.net_core" ;
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.818324");
script_version("2024-02-19T05:05:57+0000");
script_cve_id("CVE-2021-31957");
script_tag(name:"cvss_base", value:"5.0");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_tag(name:"last_modification", value:"2024-02-19 05:05:57 +0000 (Mon, 19 Feb 2024)");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2023-08-01 23:15:00 +0000 (Tue, 01 Aug 2023)");
script_tag(name:"creation_date", value:"2021-06-10 10:10:36 +0530 (Thu, 10 Jun 2021)");
script_name(".NET Core Denial of Service Vulnerability (Jun 2021)");
script_tag(name:"summary", value:"ASP.NET Core is prone to a denial of service vulnerability.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present
on the target host.");
script_tag(name:"insight", value:"The flaw exists due to an unspecified error in
the Microsoft ASP.NET Core");
script_tag(name:"impact", value:"Successful exploitation will allow an attacker
to conduct a denial of service attack on the affected system.");
script_tag(name:"affected", value:"ASP.NET Core version 5.0 and 3.1");
script_tag(name:"solution", value:"The vendor has released updates. Please see the
references for more information.");
script_tag(name:"solution_type", value:"VendorFix");
script_tag(name:"qod_type", value:"registry");
script_xref(name:"URL", value:"https://github.com/dotnet/core/blob/main/release-notes/5.0/5.0.7/5.0.7.md");
script_xref(name:"URL", value:"https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.16/3.1.16.md");
script_xref(name:"URL", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31957");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2021 Greenbone AG");
script_family("Windows");
script_dependencies("gb_asp_dotnet_core_detect_win.nasl");
script_mandatory_keys("ASP.NET/Core/Ver");
exit(0);
}
include("host_details.inc");
include("version_func.inc");
if(!infos = get_app_version_and_location(cpe:CPE, exit_no_version:TRUE)) exit(0);
coreVers = infos['version'];
path = infos['location'];
if (coreVers =~ "^3\.1" && version_is_less(version:coreVers, test_version:"3.1.16")){
fix = "3.1.16";
}
else if (coreVers =~ "^5\.0" && version_is_less(version:coreVers, test_version:"5.0.7")){
fix = "5.0.7" ;
}
if(fix)
{
report = report_fixed_ver(installed_version:coreVers, fixed_version:fix, install_path:path);
security_message(data:report);
exit(0);
}
exit(99);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
58.3%