Debian dla-4689 : libnfs-dev - 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-4689. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(327822);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/19");

  script_cve_id("CVE-2026-53689");

  script_name(english:"Debian dla-4689 : libnfs-dev - 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 / 12 host has packages installed that are affected by a vulnerability as referenced in the dla-4689
advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4689-1                [email protected]
    https://www.debian.org/lts/security/                    Thorsten Alteholz
    July 19, 2026                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libnfs
    Version        : 4.0.0-1+deb11u1 4.0.0-1+deb12u1
    CVE ID         : CVE-2026-53689
    Debian Bug     : 1139731


    An issue has been found in libnfs, am NFS client library.
    The issue is related to to a missing validation of a string size that
    might lead to an integer overflow.



    For Debian 11 bullseye, this problem has been fixed in version
    4.0.0-1+deb11u1.

    For Debian 12 bookworm, this problem has been fixed in version
    4.0.0-1+deb12u1.

    We recommend that you upgrade your libnfs packages.

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

    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

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/libnfs");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-53689");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/libnfs");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/libnfs");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libnfs-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-53689");

  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:"2026/06/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnfs-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnfs-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnfs13");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  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]+|^(12)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0 / 12.0', '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': 'libnfs-dev', 'reference': '4.0.0-1+deb11u1'},
    {'release': '11.0', 'prefix': 'libnfs-utils', 'reference': '4.0.0-1+deb11u1'},
    {'release': '11.0', 'prefix': 'libnfs13', 'reference': '4.0.0-1+deb11u1'},
    {'release': '12.0', 'prefix': 'libnfs-dev', 'reference': '4.0.0-1+deb12u1'},
    {'release': '12.0', 'prefix': 'libnfs-utils', 'reference': '4.0.0-1+deb12u1'},
    {'release': '12.0', 'prefix': 'libnfs13', 'reference': '4.0.0-1+deb12u1'}
];

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, 'libnfs-dev / libnfs-utils / libnfs13');
}