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nessusThis script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS20_JAN_ASPDOTNET_CORE.NASL
HistoryJan 17, 2020 - 12:00 a.m.

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

2020-01-1700:00:00
This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
327
microsoft asp.net core
security update
denial of service
remote code execution
vulnerabilities
cve-2020-0602
cve-2020-0603

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.024

Percentile

90.0%

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)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(133049);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2020-0602", "CVE-2020-0603");
  script_xref(name:"IAVA", value:"2020-A-0027-S");

  script_name(english:"Security Update for Microsoft ASP.NET Core (January 2020)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft ASP.NET Core installations on the remote host contain vulnerable packages.");
  script_set_attribute(attribute:"description", value:
"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)");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0602
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?530ba67f");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0603
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?374d2043");
  script_set_attribute(attribute:"see_also", value:"https://github.com/aspnet/Announcements/issues/402");
  script_set_attribute(attribute:"see_also", value:"https://github.com/aspnet/Announcements/issues/403");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/aspnetcore/issues/18336");
  script_set_attribute(attribute:"see_also", value:"https://github.com/dotnet/aspnetcore/issues/18337");
  script_set_attribute(attribute:"solution", value:
"Update ASP.NET Core, remove vulnerable packages and refer to vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  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:H/I:H/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-2020-0603");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/17");

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

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

  script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("microsoft_asp_dotnet_core_win.nbin");
  script_require_keys("installed_sw/ASP .NET Core Windows");
  script_require_ports(139, 445);

  exit(0);
}

include('global_settings.inc');
include('audit.inc');
include('install_func.inc');
include('misc_func.inc');
include('smb_func.inc');
include('vcf.inc');

appname = 'ASP .NET Core Windows';
port = kb_smb_transport();
vuln = FALSE;
install = get_single_install(app_name:appname);

report =
  '\n  Path              : ' + install['path'] +
  '\n  Installed version : ' + install['version'] +
  '\n';

package_dat = {
  'Microsoft.AspNetCore.All':{
    'constraints':[
      { 'min_version' : '2.1.0', 'fixed_version' : '2.1.15' }
    ]
  },
  'Microsoft.AspNetCore.App':{
    'constraints':[
      { 'min_version' : '2.1.0', 'fixed_version' : '2.1.15' },
      { 'min_version' : '3.0.0', 'fixed_version' : '3.0.1' },
      { 'min_version' : '3.1.0', 'fixed_version' : '3.1.1' }
    ]
  },
  'Microsoft.AspNetCore.Http.Connections':{
    'constraints':[
      { 'min_version' : '1.0.0', 'max_version' : '1.0.4', 'fixed_version' : '1.0.15' }
    ]
  }
};

foreach package (keys(package_dat))
{
  foreach instance (split(install[package], sep:';', keep:false))
  {
    inst = split(instance, sep:'?', keep:false);
    out = vcf::check_version(version:vcf::parse_version(inst[0]), constraints:package_dat[package]['constraints']);
    if(!vcf::is_error(out) && !isnull(out))
    {
      vuln = TRUE;
      report +=
        '\n  Package           : ' + package +
        '\n  Path              : ' + inst[1] +
        '\n  Installed version : ' + inst[0] +
        '\n  Fixed version     : ' + out['fixed_version'] +
        '\n';
    }
  }
}

if(!vuln) audit(AUDIT_INST_VER_NOT_VULN, appname + ' ' + install['version']);

security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.024

Percentile

90.0%