Debian dla-4766 : cyrus-admin - 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-4766. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(342180);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/01");

  script_cve_id(
    "CVE-2026-47081",
    "CVE-2026-47082",
    "CVE-2026-47084",
    "CVE-2026-47085",
    "CVE-2026-47086",
    "CVE-2026-47087",
    "CVE-2026-47088",
    "CVE-2026-47089"
  );

  script_name(english:"Debian dla-4766 : cyrus-admin - 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 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4766 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4766-1                [email protected]
    https://www.debian.org/lts/security/                       Xavier Guimard
    September 01, 2026                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : cyrus-imapd
    Version        : 3.6.1-4+deb12u5
    CVE ID         : CVE-2026-47081 CVE-2026-47082 CVE-2026-47084 CVE-2026-47085
                     CVE-2026-47086 CVE-2026-47087 CVE-2026-47088 CVE-2026-47089

    Several vulnerabilities were discovered in cyrus-imapd, a highly scalable
    mail store with support for IMAP, JMAP, POP3, CalDAV and CardDAV. Most of
    them allow authenticated users to bypass access control lists (ACL) and to
    access or modify other users' mailboxes.

    CVE-2026-47081

        The XAPPLEPUSHSERVICE command allowed an authenticated user to probe
        for the existence of other users' mailboxes and to hijack their push
        notifications.

    CVE-2026-47082

        Delivery of the Sieve vacation fcc copy skipped the ACL check on the
        destination mailbox, allowing a user to write messages into a mailbox
        they have no rights on.

    CVE-2026-47084

        The LOCALDELETE command bypassed ACL checks, allowing non-admin users
        to delete mailboxes they are not permitted to delete.

    CVE-2026-47085

        URLAUTH tokens could be forged because a predictable empty mboxkey was
        accepted, giving unauthorized access to message content.

    CVE-2026-47086

        The GENURLAUTH command issued URLAUTH tokens without checking the
        ACL_READ right on the target mailbox.

    CVE-2026-47087

        URLAUTH tokens remained valid after the access rights of the user who
        issued them had been revoked.

    CVE-2026-47088

        A heap out-of-bounds read was possible when parsing nested MIME
        comments in RFC 822 headers, which may lead to a denial of service.

    CVE-2026-47089

        The LISTRIGHTS command was not restricted to users having admin rights
        on the target mailbox, disclosing the ACL of other users' mailboxes.

    These issues were fixed upstream in Cyrus IMAP 3.10.3 and have been
    backported to the 3.6 branch, which upstream no longer supports.

    For Debian 12 bookworm, these problems have been fixed in version
    3.6.1-4+deb12u5.

    We recommend that you upgrade your cyrus-imapd packages.

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

    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 these issues but has instead relied only on the application's self-reported version
number.");
  # https://security-tracker.debian.org/tracker/source-package/cyrus-imapd
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f390528c");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47081");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47082");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47084");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47085");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47086");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47087");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47088");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47089");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/cyrus-imapd");
  script_set_attribute(attribute:"solution", value:
"Upgrade the cyrus-admin packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/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:N/I:H/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-2026-47084");

  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:"2026/07/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-admin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-caldav");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-imapd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-murder");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-nntpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-pop3d");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:cyrus-replication");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcyrus-imap-perl");
  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:"^(12)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 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': '12.0', 'prefix': 'cyrus-admin', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-caldav', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-clients', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-common', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-dev', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-doc', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-imapd', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-murder', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-nntpd', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-pop3d', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'cyrus-replication', 'reference': '3.6.1-4+deb12u5'},
    {'release': '12.0', 'prefix': 'libcyrus-imap-perl', 'reference': '3.6.1-4+deb12u5'}
];

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, 'cyrus-admin / cyrus-caldav / cyrus-clients / cyrus-common / cyrus-dev / etc');
}