Debian dla-4453 : inetutils - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4453. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(296511);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/12");

  script_cve_id("CVE-2026-24061");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2026/02/16");

  script_name(english:"Debian dla-4453 : inetutils - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4453
advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4453-1                [email protected]
    https://www.debian.org/lts/security/                   Andreas Henriksson
    January 25, 2026                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : inetutils
    Version        : 2:2.0-1+deb11u3
    CVE ID         : CVE-2026-24061
    Debian Bug     : 1126047

    Kyu Neushwaistein aka Carlos Cortes Alvarez found that inetutils,
    a collection of common network programs, was vulnerable to an authentication
    bypass problem in telnetd, which could lead to remote root shell access (if
    telnetd is enabled and exposed).

    As described also in the GNU InetUtils security advisory, it is not
    recommended to run telnetd server at all. At a minimum, restrict network
    access to the telnet port to trusted clients only. There is after all no
    encryption built into the telnet protocol, so authentication details would
    be sent in plain text over the network (which thus needs to be trusted).

    For more details see the GNU InetUtils Security Advisory:
    https://lists.gnu.org/archive/html/bug-inetutils/2026-01/msg00004.html

    For Debian 11 bullseye, this problem has been fixed in version
    2:2.0-1+deb11u3.

    We recommend that you upgrade your inetutils packages.

    For the detailed security status of inetutils please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/inetutils

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    Attachment:
    signature.asc
    Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/inetutils");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-24061");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/inetutils");
  script_set_attribute(attribute:"solution", value:
"Upgrade the inetutils packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-24061");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'GNU Inetutils Telnet Authentication Bypass Exploit CVE-2026-24061');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-ftp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-ftpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-inetd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-ping");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-syslogd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-talk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-talkd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-telnet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-telnetd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:inetutils-traceroute");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'inetutils-ftp', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-ftpd', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-inetd', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-ping', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-syslogd', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-talk', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-talkd', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-telnet', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-telnetd', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-tools', 'reference': '2:2.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'inetutils-traceroute', 'reference': '2:2.0-1+deb11u3'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_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');
}