Ubuntu 23.10 : .Net regressions (USN-6438-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6438-2. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(183873);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id("CVE-2023-36799");
  script_xref(name:"USN", value:"6438-2");

  script_name(english:"Ubuntu 23.10 : .Net regressions (USN-6438-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 23.10 host has packages installed that are affected by a vulnerability as referenced in the USN-6438-2
advisory.

    USN-6438-1 fixed vulnerabilities in .Net. It was discovered that the fix for
    [CVE-2023-36799](https://ubuntu.com/security/CVE-2023-36799) was incomplete. This update fixes the
    problem.

    Original advisory details:

    Kevin Jones discovered that .NET did not properly process certain

    X.509 certificates. An attacker could possibly use this issue to

    cause a denial of service. (CVE-2023-36799)

    It was discovered that the .NET Kestrel web server did not properly

    handle HTTP/2 requests. A remote attacker could possibly use this

    issue to cause a denial of service. (CVE-2023-44487)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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://ubuntu.com/security/notices/USN-6438-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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: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-2023-36799");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/09/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-host-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-6.0-source-built-artifacts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-7.0-source-built-artifacts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-6.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:netstandard-targeting-pack-2.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:netstandard-targeting-pack-2.1-7.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 23.10', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '23.10', 'pkgname': 'aspnetcore-runtime-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'aspnetcore-runtime-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'aspnetcore-targeting-pack-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'aspnetcore-targeting-pack-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-apphost-pack-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-apphost-pack-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-host', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-host-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-hostfxr-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-hostfxr-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-runtime-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-runtime-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-sdk-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-sdk-6.0-source-built-artifacts', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-sdk-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-sdk-7.0-source-built-artifacts', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-targeting-pack-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-targeting-pack-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-templates-6.0', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet-templates-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet6', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'dotnet7', 'pkgver': '7.0.113-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'netstandard-targeting-pack-2.1', 'pkgver': '6.0.124-0ubuntu1~23.10.1'},
    {'osver': '23.10', 'pkgname': 'netstandard-targeting-pack-2.1-7.0', 'pkgver': '7.0.113-0ubuntu1~23.10.1'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'aspnetcore-runtime-6.0 / aspnetcore-runtime-7.0 / etc');
}