NewStart CGSL MAIN 6.02 : dotnet3.1 Vulnerability (NS-SA-2021-0078)

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2021-0078. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(147317);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");

  script_cve_id("CVE-2020-1045");
  script_xref(name:"CEA-ID", value:"CEA-2020-0118");

  script_name(english:"NewStart CGSL MAIN 6.02 : dotnet3.1 Vulnerability (NS-SA-2021-0078)");

  script_set_attribute(attribute:"synopsis", value:
"The remote machine is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version MAIN 6.02, has dotnet3.1 packages installed that are affected by a
vulnerability:

  - A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie
    names.The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker
    to set a second cookie with the name being percent encoded.The security update addresses the vulnerability
    by fixing the way the ASP.NET Core cookie parser handles encoded names., aka 'Microsoft ASP.NET Core
    Security Feature Bypass Vulnerability'. (CVE-2020-1045)

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:"http://security.gd-linux.com/notice/NS-SA-2021-0078");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL dotnet3.1 packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-1045");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (release !~ "CGSL MAIN 6.02")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 6.02');

if (!get_kb_item('Host/ZTE-CGSL/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'NewStart Carrier Grade Server Linux', cpu);

flag = 0;

pkgs = {
  'CGSL MAIN 6.02': [
    'aspnetcore-runtime-3.1-3.1.10-1.el8_3',
    'aspnetcore-targeting-pack-3.1-3.1.10-1.el8_3',
    'dotnet-apphost-pack-3.1-3.1.10-1.el8_3',
    'dotnet-apphost-pack-3.1-debuginfo-3.1.10-1.el8_3',
    'dotnet-hostfxr-3.1-3.1.10-1.el8_3',
    'dotnet-hostfxr-3.1-debuginfo-3.1.10-1.el8_3',
    'dotnet-runtime-3.1-3.1.10-1.el8_3',
    'dotnet-runtime-3.1-debuginfo-3.1.10-1.el8_3',
    'dotnet-sdk-3.1-3.1.110-1.el8_3',
    'dotnet-sdk-3.1-debuginfo-3.1.110-1.el8_3',
    'dotnet-targeting-pack-3.1-3.1.10-1.el8_3',
    'dotnet-templates-3.1-3.1.110-1.el8_3',
    'dotnet3.1-debuginfo-3.1.110-1.el8_3',
    'dotnet3.1-debugsource-3.1.110-1.el8_3'
  ]
};
pkg_list = pkgs[release];

foreach (pkg in pkg_list)
  if (rpm_check(release:'ZTE ' + release, reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'dotnet3.1');
}