Oracle Linux 9 : openssl (ELSA-2026-500440)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2026-500440.
##

include('compat.inc');

if (description)
{
  script_id(369499);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/21");

  script_cve_id("CVE-2026-84782");
  script_xref(name:"IAVA", value:"2026-A-1072");

  script_name(english:"Oracle Linux 9 : openssl (ELSA-2026-500440)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the
ELSA-2026-500440 advisory.

    - Fixed DTLS Retransmits Handshake Messages From a Stale Buffer Offset (CVE-2026-84782)
      Resolves: RHEL-264479
    - Patch asn1_d2i_read_bio to read headers without blocking
      Resolves: RHEL-178642

    Fix CVE-2026-7383, CVE-2026-9076, CVE-2026-34180, CVE-2026-34181,
    CVE-2026-34183, CVE-2026-42764, CVE-2026-42766, CVE-2026-42767, CVE-2026-42768,
    CVE-2026-42769, CVE-2026-42770, CVE-2026-45445, CVE-2026-45446, CVE-2026-45447,
    CVE-2026-34182.
    Resolves:             RHEL-179274
    Resolves:             RHEL-179287
    Resolves:             RHEL-179539
    Resolves:             RHEL-179544
    Resolves:             RHEL-179547
    Resolves:             RHEL-179552
    Resolves:             RHEL-179556
    Resolves:             RHEL-179633
    Resolves:             RHEL-179661
    Resolves:             RHEL-179678
    Resolves:             RHEL-179684
    Resolves:             RHEL-179688
    Resolves:             RHEL-179691
    Resolves:             RHEL-179696
    Resolves:             RHEL-179699
    - Fix CVE-2026-28390
      Resolves: RHEL-165870
    - Fix CVE-2026-31790
      Resolves: RHEL-161586

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2026-500440.html");
  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:"2026/10/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssl-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssl-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssl-perl");
  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:"Oracle Linux 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_info2.nasl");
  script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_product)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
if (! preg(pattern:"^9([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'Oracle Linux 9.x', 'Oracle Linux ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) 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$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

var constraints = [
  {
    'release': '9',
    'pkgs': [
      {'reference':'openssl-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'aarch64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-devel-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'aarch64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-libs-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'aarch64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-perl-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'aarch64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-devel-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'i686', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-libs-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'i686', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'x86_64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-devel-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'x86_64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-libs-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'x86_64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'openssl-perl-3.5.8-2.0.1.ksplice1.el9_8', 'cpu':'x86_64', 'el_string':'ksplice1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'openssl / openssl-devel / openssl-libs / etc');
}