Debian dsa-6526 : dovecot-auth-lua - 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-6526. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(350920);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id(
    "CVE-2026-27852",
    "CVE-2026-33263",
    "CVE-2026-33604",
    "CVE-2026-33605",
    "CVE-2026-33606",
    "CVE-2026-33607",
    "CVE-2026-40013",
    "CVE-2026-40014",
    "CVE-2026-40015",
    "CVE-2026-40017",
    "CVE-2026-40018",
    "CVE-2026-40203",
    "CVE-2026-40204",
    "CVE-2026-40205",
    "CVE-2026-42007",
    "CVE-2026-42008",
    "CVE-2026-42391",
    "CVE-2026-42392",
    "CVE-2026-42393",
    "CVE-2026-42394",
    "CVE-2026-42395",
    "CVE-2026-52681",
    "CVE-2026-52687",
    "CVE-2026-73208",
    "CVE-2026-73209"
  );

  script_name(english:"Debian dsa-6526 : dovecot-auth-lua - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-6526 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6526-1                   [email protected]
    https://www.debian.org/security/                       Moritz Muehlenhoff
    September 28, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : dovecot
    CVE ID         : CVE-2026-27852 CVE-2026-33263 CVE-2026-33604 CVE-2026-33605
                     CVE-2026-33606 CVE-2026-33607 CVE-2026-40013 CVE-2026-40014
                     CVE-2026-40015 CVE-2026-40017 CVE-2026-40018 CVE-2026-40203
                     CVE-2026-40204 CVE-2026-40205 CVE-2026-42007 CVE-2026-42008
                     CVE-2026-42391 CVE-2026-42392 CVE-2026-42393 CVE-2026-42394
                     CVE-2026-42395 CVE-2026-52681 CVE-2026-52687 CVE-2026-73208
                     CVE-2026-73209
    Debian Bug     : 1144639

    Multiple vulnerabilities have been discovered in the Dovecot IMAP server
    which could result in denial of service, SMTP smuggling, information
    disclosure, code injection via malformed Sieve scripts or bypass of ACL
    restrictions.

    For the stable distribution (trixie), these problems have been fixed in
    version 1:2.4.1+dfsg1-6+deb13u7.

    We recommend that you upgrade your dovecot packages.

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

    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 these issues 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/dovecot");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-27852");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33263");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33604");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33605");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33606");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33607");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40013");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40014");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40015");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40017");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40018");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40203");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40204");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40205");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42007");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42008");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42391");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42392");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42393");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42394");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42395");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-52681");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-52687");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-73208");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-73209");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/dovecot");
  script_set_attribute(attribute:"solution", value:
"Upgrade the dovecot-auth-lua packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:C");
  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:C/C:L/I:L/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42007");

  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:"2026/08/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-auth-lua");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-flatcurve");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-gssapi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-imapd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-lmtpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-managesieved");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-pop3d");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-sieve");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-solr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-sqlite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot-submissiond");
  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': 'dovecot-auth-lua', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-core', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-dev', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-flatcurve', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-gssapi', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-imapd', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-ldap', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-lmtpd', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-managesieved', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-mysql', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-pgsql', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-pop3d', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-sieve', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-solr', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-sqlite', 'reference': '1:2.4.1+dfsg1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'dovecot-submissiond', 'reference': '1:2.4.1+dfsg1-6+deb13u7'}
];

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, 'dovecot-auth-lua / dovecot-core / dovecot-dev / dovecot-flatcurve / etc');
}