Debian dla-4795 : 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 dla-4795. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(350322);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/25");

  script_cve_id(
    "CVE-2026-42767",
    "CVE-2026-54874",
    "CVE-2026-63072",
    "CVE-2026-63074",
    "CVE-2026-63076",
    "CVE-2026-75803"
  );
  script_xref(name:"IAVA", value:"2026-A-0589-S");
  script_xref(name:"IAVA", value:"2026-A-0878");

  script_name(english:"Debian dla-4795 : 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 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4795 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4795-1                [email protected]
    https://www.debian.org/lts/security/                     Arnaud Rebillout
    September 25, 2026                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : openssl
    Version        : 3.0.22-1~deb12u1
    CVE ID         : CVE-2026-42767 CVE-2026-54874 CVE-2026-63072 CVE-2026-63074
                     CVE-2026-63076 CVE-2026-75803
    Debian Bug     : 1139674 1145172

    Several vulnerabilities have been discovered in OpenSSL, a Secure Socket
    Layer toolkit providing the SSL and TLS cryptographic protocols for secure
    communication over the Internet.

    CVE-2026-42767

        An attacker-controlled CMP (Certificate Management Protocol) server
        could trigger a NULL pointer dereference in a CMP client application.

    CVE-2026-54874

        Receiving a DTLS record for a future epoch while a handshake is in
        progress causes OpenSSL to buffer far more memory than the record
        itself requires.

    CVE-2026-63072

        OpenSSL CMS decryption sizes the key-unwrap output buffer based on
        querying the unwrapped key size, but the AES-WRAP-PAD unwrap
        primitive can write and cleanse more bytes than that query reports,
        causing an 8-byte out-of-bounds heap write.

    CVE-2026-63074

        The OpenSSL Certificate Management Protocol (CMP) caches additional
        certificates (extraCerts) sent in a CMP message, but never expunges
        them (for instance if they are invalid). If a server reuses an
        OSSL_CMP_CTX frequently, this cache of extraCerts may grow
        unboundedly, and a malicious client may flood a CMP server with
        requests driving this growth.

    CVE-2026-63076

        OpenSSL CMP password based protection verification only checks
        whether the protectionAlg parameter was not NULL and not its ASN.1
        type, before treating it as a PBMParameter. A crafted message can
        contain a parameter of a different type, which is then dereferenced
        as an invalid pointer.

    CVE-2026-75803

        ChaCha20-Poly1305 and AES-OCB decryption with an empty ciphertext can
        report success without verifying the supplied authentication tag when
        the operation is finalized by calling the EVP_Cipher() function.

    For Debian 12 bookworm, these problems have been fixed in version
    3.0.22-1~deb12u1.

    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 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/openssl");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42767");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54874");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-63072");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-63074");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-63076");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-75803");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/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:C/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:N/UI:N/S:U/C:H/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-2026-75803");

  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:"2026/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/25");

  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");
  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:openssl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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': 'libcrypto3-udeb', 'reference': '3.0.22-1~deb12u1'},
    {'release': '12.0', 'prefix': 'libssl-dev', 'reference': '3.0.22-1~deb12u1'},
    {'release': '12.0', 'prefix': 'libssl-doc', 'reference': '3.0.22-1~deb12u1'},
    {'release': '12.0', 'prefix': 'libssl3', 'reference': '3.0.22-1~deb12u1'},
    {'release': '12.0', 'prefix': 'libssl3-udeb', 'reference': '3.0.22-1~deb12u1'},
    {'release': '12.0', 'prefix': 'openssl', 'reference': '3.0.22-1~deb12u1'}
];

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 / libssl3-udeb / etc');
}