Debian dsa-6531 : libcrypto3-udeb - 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-6531. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(351475);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/30");

  script_cve_id(
    "CVE-2026-35189",
    "CVE-2026-35191",
    "CVE-2026-42772",
    "CVE-2026-54872",
    "CVE-2026-54873",
    "CVE-2026-54875",
    "CVE-2026-72897",
    "CVE-2026-75804",
    "CVE-2026-75805",
    "CVE-2026-75806",
    "CVE-2026-77696",
    "CVE-2026-84782",
    "CVE-2026-84784"
  );

  script_name(english:"Debian dsa-6531 : libcrypto3-udeb - 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-6531 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6531-1                   [email protected]
    https://www.debian.org/security/                     Salvatore Bonaccorso
    September 30, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : openssl
    CVE ID         : CVE-2026-35189 CVE-2026-35191 CVE-2026-42772 CVE-2026-54872
                     CVE-2026-54873 CVE-2026-54875 CVE-2026-72897 CVE-2026-75804
                     CVE-2026-75805 CVE-2026-75806 CVE-2026-77696 CVE-2026-84782
                     CVE-2026-84784

    Multiple vulnerabilities have been discovered in OpenSSL, a Secure
    Sockets Layer toolkit, which could result in denial of service,
    information disclosure or potentially recovery of private keys.

    Additional details can be found in the upstream advisories:
    https://openssl-library.org/news/secadv/20260929.txt

    For the stable distribution (trixie), these problems have been fixed in
    version 3.5.7-1~deb13u3.

    We recommend that you upgrade your openssl packages.

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

    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/openssl");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-35189");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-35191");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42772");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54872");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54873");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54875");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-72897");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-75804");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-75805");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-75806");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-77696");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-84782");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-84784");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/openssl");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libcrypto3-udeb packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/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:N/UI:N/S:U/C:L/I:N/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-2026-84782");

  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:"2026/09/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcrypto3-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libssl-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libssl3-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libssl3t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openssl-provider-fips");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openssl-provider-legacy");
  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': 'libcrypto3-udeb', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'libssl-dev', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'libssl-doc', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'libssl3-udeb', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'libssl3t64', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'openssl', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'openssl-provider-fips', 'reference': '3.5.7-1~deb13u3'},
    {'release': '13.0', 'prefix': 'openssl-provider-legacy', 'reference': '3.5.7-1~deb13u3'}
];

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, 'libcrypto3-udeb / libssl-dev / libssl-doc / libssl3-udeb / libssl3t64 / etc');
}