Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : Inetutils vulnerabilities (USN-6304-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6304-1. 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(180029);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/22");

  script_cve_id("CVE-2022-39028", "CVE-2023-40303");
  script_xref(name:"USN", value:"6304-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : Inetutils vulnerabilities (USN-6304-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  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 multiple
vulnerabilities as referenced in the USN-6304-1 advisory.

  - telnetd in GNU Inetutils through 2.3, MIT krb5-appl through 1.0.3, and derivative works has a NULL pointer
    dereference via 0xff 0xf7 or 0xff 0xf8. In a typical installation, the telnetd application would crash but
    the telnet service would remain available through inetd. However, if the telnetd application has many
    crashes within a short time interval, the telnet service would become unavailable after inetd logs a
    telnet/tcp server failing (looping), service terminated error. NOTE: MIT krb5-appl is not supported
    upstream but is shipped by a few Linux distributions. The affected code was removed from the supported MIT
    Kerberos 5 (aka krb5) product many years ago, at version 1.8. (CVE-2022-39028)

  - GNU inetutils through 2.4 may allow privilege escalation because of unchecked return values of set*id()
    family functions in ftpd, rcp, rlogin, rsh, rshd, and uucpd. This is, for example, relevant if the setuid
    system call fails when a process is trying to drop privileges before letting an ordinary user control the
    activities of the process. (CVE-2023-40303)

Note that Nessus has not tested for these issues 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-6304-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-40303");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/08/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/22");

  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:inetutils-ftp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-ftpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-inetd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-ping");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-syslogd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-talk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-talkd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-telnet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-telnetd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:inetutils-traceroute");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:telnet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:telnetd");
  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 Canonical, Inc. / NASL script (C) 2023 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': 'inetutils-ftp', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-ftpd', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-inetd', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-ping', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-syslogd', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-talk', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-talkd', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-telnet', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-telnetd', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-tools', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '20.04', 'pkgname': 'inetutils-traceroute', 'pkgver': '2:1.9.4-11ubuntu0.2'},
    {'osver': '22.04', 'pkgname': 'inetutils-ftp', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-ftpd', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-inetd', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-ping', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-syslogd', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-talk', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-talkd', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-telnet', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-telnetd', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-tools', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'inetutils-traceroute', 'pkgver': '2:2.2-2ubuntu0.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-ftp', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-ftpd', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-inetd', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-ping', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-syslogd', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-talk', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-talkd', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-telnet', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-telnetd', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-tools', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'inetutils-traceroute', 'pkgver': '2:2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'telnet', 'pkgver': '0.17+2.4-2ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'telnetd', 'pkgver': '0.17+2.4-2ubuntu1.1'}
];

var flag = 0;
foreach 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)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'inetutils-ftp / inetutils-ftpd / inetutils-inetd / inetutils-ping / etc');
}