Debian dla-4673 : dpkg - 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-4673. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(325676);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/08");

  script_cve_id("CVE-2025-6297");

  script_name(english:"Debian dla-4673 : dpkg - 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-4673
advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4673-1                [email protected]
    https://www.debian.org/lts/security/                     Arnaud Rebillout
    July 08, 2026                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : dpkg
    Version        : 1.20.14
    CVE ID         : CVE-2025-6297
    Debian Bug     : 1061404 1065575 1107971 1108192

    A vulnerability have been discovered in dpkg, the Debian package manager
    (dpkg is the low-level tool that actually installs or removes packages).

    CVE-2025-6297

        It was discovered that dpkg-deb does not properly sanitize directory
        permissions when extracting a control member into a temporary
        directory, which is documented as being a safe operation even on
        untrusted data. This may result in leaving temporary files behind on
        cleanup. Given automated and repeated execution of dpkg-deb commands
        on adversarial .deb packages or with well compressible files, placed
        inside a directory with permissions not allowing removal by a
        non-root user, this can end up in a DoS scenario due to causing disk
        quota exhaustion or disk full conditions.

    Additionally, this version includes some minor security fixes that didn't
    receive a CVE number, but were reported on the Debian bug tracker, see
    the list of Debian bugs above.

    For Debian 11 bullseye, this problem has been fixed in version
    1.20.14.

    We recommend that you upgrade your dpkg packages.

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

    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/dpkg");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-6297");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/dpkg");
  script_set_attribute(attribute:"solution", value:
"Upgrade the dpkg packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:P/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:N/UI:N/S:U/C:H/I:L/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-2025-6297");

  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:"2025/07/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dpkg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dpkg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dselect");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdpkg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libdpkg-perl");
  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': 'dpkg', 'reference': '1.20.14'},
    {'release': '11.0', 'prefix': 'dpkg-dev', 'reference': '1.20.14'},
    {'release': '11.0', 'prefix': 'dselect', 'reference': '1.20.14'},
    {'release': '11.0', 'prefix': 'libdpkg-dev', 'reference': '1.20.14'},
    {'release': '11.0', 'prefix': 'libdpkg-perl', 'reference': '1.20.14'}
];

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, 'dpkg / dpkg-dev / dselect / libdpkg-dev / libdpkg-perl');
}