Debian dla-4384 : ctdb - 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-4384. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(277289);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/03");

  script_cve_id("CVE-2025-9640");
  script_xref(name:"IAVA", value:"2025-A-0777");

  script_name(english:"Debian dla-4384 : ctdb - 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-4384
advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4384-1                [email protected]
    https://www.debian.org/lts/security/                      Paride Legovini
    November 26, 2025                             https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : samba
    Version        : 2:4.13.13+dfsg-1~deb11u7
    CVE ID         : CVE-2025-9640

    A flaw was found in Samba, in the vfs_streams_xattr module, where uninitialized
    heap memory could be written into alternate data streams. This allows an
    authenticated user to read residual memory content that may include sensitive
    data, resulting in an information disclosure vulnerability.

    For Debian 11 bullseye, this problem has been fixed in version
    2:4.13.13+dfsg-1~deb11u7.

    We recommend that you upgrade your samba packages.

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

    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/samba");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-9640");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/samba");
  script_set_attribute(attribute:"solution", value:
"Upgrade the ctdb packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:N/A:N");
  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:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-9640");

  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:"2025/10/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsmbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwbclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:registry-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-common-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-dsdb-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-vfs-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:smbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:winbind");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025 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': 'ctdb', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'libnss-winbind', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'libpam-winbind', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'libsmbclient', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'libsmbclient-dev', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'libwbclient-dev', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'libwbclient0', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'python3-samba', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'registry-tools', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-common', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-common-bin', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-dev', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-dsdb-modules', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-libs', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-testsuite', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'samba-vfs-modules', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'smbclient', 'reference': '2:4.13.13+dfsg-1~deb11u7'},
    {'release': '11.0', 'prefix': 'winbind', 'reference': '2:4.13.13+dfsg-1~deb11u7'}
];

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_WARNING,
    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, 'ctdb / libnss-winbind / libpam-winbind / libsmbclient / etc');
}