Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSL vulnerabilities (USN-8678-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8678-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(365402);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/13");

  script_cve_id(
    "CVE-2026-14456",
    "CVE-2026-14457",
    "CVE-2026-18798",
    "CVE-2026-54874",
    "CVE-2026-63072",
    "CVE-2026-63073",
    "CVE-2026-63074",
    "CVE-2026-63075",
    "CVE-2026-63076",
    "CVE-2026-75803"
  );
  script_xref(name:"IAVA", value:"2026-A-0878-S");
  script_xref(name:"USN", value:"8678-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSL vulnerabilities (USN-8678-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8678-1 advisory.

    It was discovered that OpenSSL incorrectly handled the QUIC server incoming channel queue. A remote
    attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of
    service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-14456)

    It was discovered that OpenSSL incorrectly handled signature algorithm selection when using Raw Public
    Keys. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of
    service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-14457)

    It was discovered that OpenSSL incorrectly handled QUIC INITIAL packet processing. A remote attacker could
    possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only
    affected Ubuntu 26.04 LTS. (CVE-2026-18798)

    It was discovered that OpenSSL incorrectly handled buffering of DTLS records for a future epoch. A remote
    attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of
    service. (CVE-2026-54874)

    It was discovered that OpenSSL incorrectly handled CMS key unwrapping. A remote attacker could possibly
    use this issue to cause a heap buffer overflow, leading to a denial of service or arbitrary code
    execution. (CVE-2026-63072)

    It was discovered that OpenSSL incorrectly validated the sender distinguished name in CMP response
    messages. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial
    of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-63073)

    It was discovered that OpenSSL incorrectly limited the growth of an internal certificate cache used during
    CMP operations. A remote attacker could possibly use this issue to cause OpenSSL to use excessive
    resources, leading to a denial of service. (CVE-2026-63074)

    It was discovered that OpenSSL incorrectly handled QUIC ACK-only packet retention. A remote attacker could
    possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of service. This
    issue only affected Ubuntu 26.04 LTS. (CVE-2026-63075)

    It was discovered that OpenSSL incorrectly handled CMP protection algorithm validation. A remote attacker
    could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service.
    (CVE-2026-63076)

    It was discovered that OpenSSL incorrectly verified authentication tags when using certain AEAD ciphers
    via the EVP_Cipher() interface. An attacker could possibly use this issue to perform AEAD forgery attacks.
    (CVE-2026-75803)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-8678-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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: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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-63073");

  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:"2026/08/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl3t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssl-provider-legacy");
  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:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '22.04', 'pkgname': 'libssl3', 'pkgver': '3.0.2-0ubuntu1.29', 'cves': ['CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63074', 'CVE-2026-63076', 'CVE-2026-75803']},
    {'osver': '22.04', 'pkgname': 'openssl', 'pkgver': '3.0.2-0ubuntu1.29', 'cves': ['CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63074', 'CVE-2026-63076', 'CVE-2026-75803']},
    {'osver': '24.04', 'pkgname': 'libssl3t64', 'pkgver': '3.0.13-0ubuntu3.15', 'cves': ['CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63074', 'CVE-2026-63076', 'CVE-2026-75803']},
    {'osver': '24.04', 'pkgname': 'openssl', 'pkgver': '3.0.13-0ubuntu3.15', 'cves': ['CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63074', 'CVE-2026-63076', 'CVE-2026-75803']},
    {'osver': '26.04', 'pkgname': 'libssl3t64', 'pkgver': '3.5.5-1ubuntu3.4', 'cves': ['CVE-2026-14456', 'CVE-2026-14457', 'CVE-2026-18798', 'CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63073', 'CVE-2026-63074', 'CVE-2026-63075', 'CVE-2026-63076', 'CVE-2026-75803']},
    {'osver': '26.04', 'pkgname': 'openssl', 'pkgver': '3.5.5-1ubuntu3.4', 'cves': ['CVE-2026-14456', 'CVE-2026-14457', 'CVE-2026-18798', 'CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63073', 'CVE-2026-63074', 'CVE-2026-63075', 'CVE-2026-63076', 'CVE-2026-75803']},
    {'osver': '26.04', 'pkgname': 'openssl-provider-legacy', 'pkgver': '3.5.5-1ubuntu3.4', 'cves': ['CVE-2026-14456', 'CVE-2026-14457', 'CVE-2026-18798', 'CVE-2026-54874', 'CVE-2026-63072', 'CVE-2026-63073', 'CVE-2026-63074', 'CVE-2026-63075', 'CVE-2026-63076', 'CVE-2026-75803']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libssl3 / libssl3t64 / openssl / openssl-provider-legacy');
}