Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSL vulnerabilities (USN-8847-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8847-1. 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(351469);
  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-2026-54872",
    "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_xref(name:"USN", value:"8847-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenSSL vulnerabilities (USN-8847-1)");

  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-8847-1 advisory.

    It was discovered that OpenSSL incorrectly handled certain certificate revocation list distribution point
    names. An attacker could possibly use this issue to cause OpenSSL to consume excessive memory, resulting
    in a denial of service. (CVE-2026-35189)

    It was discovered that OpenSSL incorrectly handled QUIC unvalidated amplification credit accounting. An
    attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 26.04
    LTS. (CVE-2026-35191)

    It was discovered that OpenSSL incorrectly implemented scalar multiplication for non-NIST elliptic curves.
    An attacker could possibly use this issue to perform a timing side-channel attack and obtain sensitive
    information. (CVE-2026-54872)

    It was discovered that OpenSSL incorrectly implemented SM2 scalar multiplication on ARM64 and RISC-V
    architectures. An attacker could possibly use this issue to perform a timing side-channel attack and
    obtain sensitive information. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-54875)

    It was discovered that OpenSSL incorrectly handled SSL context switching during a TLS handshake. An
    attacker could possibly use this issue to cause an out-of-bounds read, resulting in a denial of service or
    obtaining sensitive information. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-72897)

    It was discovered that OpenSSL incorrectly enforced QUIC connection- level flow control for streams. An
    attacker could possibly use this issue to cause OpenSSL to consume excessive memory, resulting in a denial
    of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-75804)

    It was discovered that OpenSSL incorrectly handled a NULL pointer in CMP client revocation response
    processing. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-75805)

    It was discovered that OpenSSL incorrectly handled undersized DTLS 1.2 AEAD records before authentication.
    An attacker could possibly use this issue to cause a denial of service. (CVE-2026-75806)

    It was discovered that OpenSSL incorrectly implemented SM2 signature generation. An attacker could
    possibly use this issue to perform a timing side-channel attack and obtain sensitive information.
    (CVE-2026-77696)

    It was discovered that OpenSSL incorrectly handled DTLS retransmission of handshake messages. An attacker
    could possibly use this issue to cause incorrect handshake behavior or a denial of service.
    (CVE-2026-84782)

    It was discovered that OpenSSL incorrectly handled QUIC RETIRE_CONNECTION_ID frames. An attacker could
    possibly use this issue to cause OpenSSL to consume excessive memory, resulting in a denial of service.
    This issue only affected Ubuntu 26.04 LTS. (CVE-2026-84784)

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-8847-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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:"2026/09/29");
  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:"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_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_info.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': '3.0.2-0ubuntu1.30', 'cves': ['CVE-2026-35189', 'CVE-2026-54872', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782']},
    {'osver': '22.04', 'pkgname': 'openssl', 'pkgver': '3.0.2-0ubuntu1.30', 'cves': ['CVE-2026-35189', 'CVE-2026-54872', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782']},
    {'osver': '24.04', 'pkgname': 'libssl3t64', 'pkgver': '3.0.13-0ubuntu3.16', 'cves': ['CVE-2026-35189', 'CVE-2026-54872', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782']},
    {'osver': '24.04', 'pkgname': 'openssl', 'pkgver': '3.0.13-0ubuntu3.16', 'cves': ['CVE-2026-35189', 'CVE-2026-54872', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782']},
    {'osver': '26.04', 'pkgname': 'libssl3t64', 'pkgver': '3.5.5-1ubuntu3.6', 'cves': ['CVE-2026-35189', 'CVE-2026-35191', 'CVE-2026-54872', 'CVE-2026-54875', 'CVE-2026-72897', 'CVE-2026-75804', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782', 'CVE-2026-84784']},
    {'osver': '26.04', 'pkgname': 'openssl', 'pkgver': '3.5.5-1ubuntu3.6', 'cves': ['CVE-2026-35189', 'CVE-2026-35191', 'CVE-2026-54872', 'CVE-2026-54875', 'CVE-2026-72897', 'CVE-2026-75804', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782', 'CVE-2026-84784']},
    {'osver': '26.04', 'pkgname': 'openssl-provider-legacy', 'pkgver': '3.5.5-1ubuntu3.6', 'cves': ['CVE-2026-35189', 'CVE-2026-35191', 'CVE-2026-54872', 'CVE-2026-54875', 'CVE-2026-72897', 'CVE-2026-75804', 'CVE-2026-75805', 'CVE-2026-75806', 'CVE-2026-77696', 'CVE-2026-84782', 'CVE-2026-84784']}
];

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');
}