Debian dsa-6462 : libnvpair3linux - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-6462. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(339127);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/24");

  script_name(english:"Debian dsa-6462 : libnvpair3linux - 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 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6462
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6462-1                   [email protected]
    https://www.debian.org/security/                                  Aron Xu
    August 24, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : zfs-linux

    Erica Windisch reported several vulnerabilities in the Linux
    implementation of OpenZFS, a filesystem and volume manager.

    The administrative operations exposed by the /dev/zfs ioctl interface
    accepted the CAP_SYS_ADMIN capability in the calling process's own user
    namespace as authority over pools on the host, instead of requiring it
    in the initial user namespace.  In addition, opening a vdev did not
    check that the caller was permitted to access the underlying device
    node or backing file.  Since /dev/zfs is world-accessible and
    unprivileged user namespaces are enabled by default, a local user can
    take advantage of these flaws to administer pools on the host, to
    attach and write to devices they have no permission to access, and
    thereby to escalate privileges or cause a denial of service.  The same
    flaws allow a process in a container to which /dev/zfs is exposed to
    act on the host storage stack.

    This update is based on the upstream 2.3.9 release, which also contains
    a number of fixes for data corruption, kernel panics and deadlocks.

    For the stable distribution (trixie), this problem has been fixed in
    version 2.3.9-0+deb13u1.

    We recommend that you upgrade your zfs-linux packages.

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

    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/

    Mailing list: [email protected]

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/zfs-linux");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/zfs-linux");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libnvpair3linux packages.");
  script_set_attribute(attribute:"risk_factor", value:"High");

  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:"2026/08/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnvpair3linux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-zfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libuutil3linux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzfs6linux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzfsbootenv1linux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzfslinux-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzpool6linux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-pyzfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:pyzfs-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zfs-dkms");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zfs-dracut");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zfs-initramfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zfs-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zfs-zed");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zfsutils-linux");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  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:"^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 13.0', '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': '13.0', 'prefix': 'libnvpair3linux', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libpam-zfs', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libuutil3linux', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libzfs6linux', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libzfsbootenv1linux', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libzfslinux-dev', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libzpool6linux', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'python3-pyzfs', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'pyzfs-doc', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'zfs-dkms', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'zfs-dracut', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'zfs-initramfs', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'zfs-test', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'zfs-zed', 'reference': '2.3.9-0+deb13u1'},
    {'release': '13.0', 'prefix': 'zfsutils-linux', 'reference': '2.3.9-0+deb13u1'}
];

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, 'libnvpair3linux / libpam-zfs / libuutil3linux / libzfs6linux / etc');
}