Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : Kerberos vulnerability (USN-6467-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6467-2. 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(184451);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/18");

  script_cve_id("CVE-2023-36054");
  script_xref(name:"USN", value:"6467-2");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : Kerberos vulnerability (USN-6467-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS / 22.04 LTS / 23.04 host has packages installed that are affected by a vulnerability as
referenced in the USN-6467-2 advisory.

    USN-6467-1 fixed a vulnerability in Kerberos. This update provides the corresponding update for Ubuntu
    20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 23.04.

    Original advisory details:

    Robert Morris discovered that Kerberos did not properly handle memory

    access when processing RPC data through kadmind, which could lead to the

    freeing of uninitialized memory. An authenticated remote attacker could

    possibly use this issue to cause kadmind to crash, resulting in a denial

    of service.

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-6467-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:L/UI:N/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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-36054");

  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:"2023/07/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/11/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/11/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-admin-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-gss-samples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-k5tls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-kdc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-kdc-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-kpropd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-locales");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-multidev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-otp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-pkinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:krb5-user");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgssapi-krb5-2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgssrpc4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libk5crypto3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkdb5-10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkdb5-9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrad-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrad0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrb5-3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrb5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libkrb5support0");
  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 (! ('20.04' >< os_release || '22.04' >< os_release || '23.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.04', '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': '20.04', 'pkgname': 'krb5-admin-server', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-gss-samples', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-k5tls', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-kdc', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-kdc-ldap', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-kpropd', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-locales', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-multidev', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-otp', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-pkinit', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'krb5-user', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libgssapi-krb5-2', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libgssrpc4', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libk5crypto3', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkadm5clnt-mit11', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkadm5srv-mit11', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkdb5-9', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkrad-dev', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkrad0', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkrb5-3', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkrb5-dev', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '20.04', 'pkgname': 'libkrb5support0', 'pkgver': '1.17-6ubuntu4.4'},
    {'osver': '22.04', 'pkgname': 'krb5-admin-server', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-gss-samples', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-k5tls', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-kdc', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-kdc-ldap', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-kpropd', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-locales', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-multidev', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-otp', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-pkinit', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'krb5-user', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libgssapi-krb5-2', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libgssrpc4', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libk5crypto3', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkadm5clnt-mit12', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkadm5srv-mit12', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkdb5-10', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkrad-dev', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkrad0', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkrb5-3', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkrb5-dev', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libkrb5support0', 'pkgver': '1.19.2-2ubuntu0.3'},
    {'osver': '23.04', 'pkgname': 'krb5-admin-server', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-gss-samples', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-k5tls', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-kdc', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-kdc-ldap', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-kpropd', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-locales', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-multidev', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-otp', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-pkinit', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'krb5-user', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libgssapi-krb5-2', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libgssrpc4', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libk5crypto3', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkadm5clnt-mit12', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkadm5srv-mit12', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkdb5-10', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkrad-dev', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkrad0', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkrb5-3', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkrb5-dev', 'pkgver': '1.20.1-1ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'libkrb5support0', 'pkgver': '1.20.1-1ubuntu0.1'}
];

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_WARNING,
    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, 'krb5-admin-server / krb5-gss-samples / krb5-k5tls / krb5-kdc / etc');
}