Debian dla-4705 : calibre - 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-4705. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(330617);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/29");

  script_cve_id(
    "CVE-2026-27810",
    "CVE-2026-27824",
    "CVE-2026-30853",
    "CVE-2026-33205",
    "CVE-2026-33206"
  );

  script_name(english:"Debian dla-4705 : calibre - 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 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4705 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4705-1                [email protected]
    https://www.debian.org/lts/security/                          Abhijith PA
    July 29, 2026                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : calibre
    Version        : 5.12.0+dfsg-1+deb11u5
    CVE ID         : CVE-2026-27810 CVE-2026-27824 CVE-2026-30853 CVE-2026-33205
                     CVE-2026-33206

    Multiple vulnerabilities have been discovered in calibre, an e-book
    manager.

    CVE-2026-27810

        An HTTP Response Header Injection vulnerability in the calibre
        Content Server allows any authenticated user to inject arbitrary
        HTTP headers into server responses via an unsanitized
        `content_disposition` query parameter in the `/get/` and
        `/data-files/get/` endpoints

    CVE-2026-27824

        The calibre Content Server's brute-force protection mechanism uses
        a ban key derived from both `remote_addr` and the
        `X-Forwarded-For` header. Since the `X-Forwarded-For` header is
        read directly from the HTTP request without any validation or
        trusted-proxy configuration, an attacker can bypass IP-based bans
        by simply changing or adding this header, rendering the
        brute-force protection completely ineffective. This is
        particularly dangerous for calibre servers exposed to the
        internet, where brute-force protection is the primary defense
        against credential stuffing and password guessing attacks.

    CVE-2026-30853

        A path traversal vulnerability in the RocketBook (.rb) input
        plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to
        write arbitrary files to any path writable by the calibre process
        when a user opens or converts a crafted .rb file.

    CVE-2026-33205

        A Server-Side Request Forgery vulnerability in the
        background-image endpoint of calibre e-book reader's web view
        allows an attacker to perform blind GET requests to arbitrary URLs
        and exfiltrate information out from the ebook sandbox.

    CVE-2026-33206

        A path traversal vulnerability exists in Calibre' handling of
        images in Markdown and other similar text-based files allowing an
        attacker to include arbitrary files from the file system into the
        converted book. Additionally, missing authentication and
        server-side request forgery in the background-image endpoint in the
        ebook reader web view allow the files to be exfiltrated without
        additional interaction.

    For Debian 11 bullseye, these problems have been fixed in version
    5.12.0+dfsg-1+deb11u5.

    We recommend that you upgrade your calibre packages.

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

    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.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/calibre");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-27810");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-27824");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-30853");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33205");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33206");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/calibre");
  script_set_attribute(attribute:"solution", value:
"Upgrade the calibre packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-30853");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-33206");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:calibre");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:calibre-bin");
  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': 'calibre', 'reference': '5.12.0+dfsg-1+deb11u5'},
    {'release': '11.0', 'prefix': 'calibre-bin', 'reference': '5.12.0+dfsg-1+deb11u5'}
];

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, 'calibre / calibre-bin');
}