Debian dsa-6423 : kitty - 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-6423. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(333554);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/09");

  script_cve_id(
    "CVE-2026-42850",
    "CVE-2026-42851",
    "CVE-2026-54055",
    "CVE-2026-54057"
  );

  script_name(english:"Debian dsa-6423 : kitty - 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-6423 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6423-1                   [email protected]
    https://www.debian.org/security/                             Nilesh Patra
    August 09, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : kitty
    CVE ID         : CVE-2026-42850 CVE-2026-42851 CVE-2026-54055 CVE-2026-54057
    Debian Bug     : 1139898

    Multiple security issues were discovered in kitty, a GPU based terminal
    emulator, which may result in the execution of arbitrary code, command
    injection into the shell running in the terminal, or the overwriting of
    arbitrary files, if untrusted content is displayed in a terminal window.

    For the stable distribution (trixie), these problems have been fixed in
    version 0.41.1-2+deb13u2.

    We recommend that you upgrade your kitty packages.

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

    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/kitty");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42850");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42851");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54055");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54057");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/kitty");
  script_set_attribute(attribute:"solution", value:
"Upgrade the kitty packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/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:N/AC:L/PR:N/UI:R/S:U/C:H/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:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/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-2026-42850");

  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:"2026/06/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:kitty");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:kitty-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:kitty-shell-integration");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:kitty-terminfo");
  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': 'kitty', 'reference': '0.41.1-2+deb13u2'},
    {'release': '13.0', 'prefix': 'kitty-doc', 'reference': '0.41.1-2+deb13u2'},
    {'release': '13.0', 'prefix': 'kitty-shell-integration', 'reference': '0.41.1-2+deb13u2'},
    {'release': '13.0', 'prefix': 'kitty-terminfo', 'reference': '0.41.1-2+deb13u2'}
];

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, 'kitty / kitty-doc / kitty-shell-integration / kitty-terminfo');
}