RHEL 9 : postgresql:16 (RHSA-2026:26524)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:26524. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(321354);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/17");

  script_cve_id(
    "CVE-2026-6473",
    "CVE-2026-6475",
    "CVE-2026-6477",
    "CVE-2026-6478"
  );
  script_xref(name:"RHSA", value:"2026:26524");

  script_name(english:"RHEL 9 : postgresql:16 (RHSA-2026:26524)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for postgresql:16.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:26524 advisory.

    PostgreSQL is an advanced object-relational database management system (DBMS).

    Security Fix(es):

    * postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and
    pg_rewind (CVE-2026-6475)

    * postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory
    (CVE-2026-6477)

    * postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison
    (CVE-2026-6478)

    * postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write
    (CVE-2026-6473)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2477439");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2477442");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2477447");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2477448");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_26524.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?94a81b18");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:26524");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL postgresql:16 package based on the guidance in RHSA-2026:26524.");
  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:R/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-2026-6477");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(59, 120, 190, 385);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:9.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pg_repack");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pgaudit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgres-decoderbufs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-contrib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-plperl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-plpython3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-pltcl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-private-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-private-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-server-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-test-rpm-macros");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-upgrade");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:postgresql-upgrade-devel");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat 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", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.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) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'eq', os_version: os_version, rhel_version: '9.4')) audit(AUDIT_OS_NOT, 'Red Hat 9.4', 'Red Hat ' + 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$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = {
  'postgresql:16': [
    {
      'release': '9',
      'sp': '4',
      'repo_relative_urls': [
        'content/aus/rhel9/9.4/x86_64/appstream/debug',
        'content/aus/rhel9/9.4/x86_64/appstream/os',
        'content/aus/rhel9/9.4/x86_64/appstream/source/SRPMS',
        'content/e4s/rhel9/9.4/aarch64/appstream/debug',
        'content/e4s/rhel9/9.4/aarch64/appstream/os',
        'content/e4s/rhel9/9.4/aarch64/appstream/source/SRPMS',
        'content/e4s/rhel9/9.4/ppc64le/appstream/debug',
        'content/e4s/rhel9/9.4/ppc64le/appstream/os',
        'content/e4s/rhel9/9.4/ppc64le/appstream/source/SRPMS',
        'content/e4s/rhel9/9.4/s390x/appstream/debug',
        'content/e4s/rhel9/9.4/s390x/appstream/os',
        'content/e4s/rhel9/9.4/s390x/appstream/source/SRPMS',
        'content/e4s/rhel9/9.4/x86_64/appstream/debug',
        'content/e4s/rhel9/9.4/x86_64/appstream/os',
        'content/e4s/rhel9/9.4/x86_64/appstream/source/SRPMS',
        'content/e6s/rhel9/9.4/aarch64/appstream/debug',
        'content/e6s/rhel9/9.4/aarch64/appstream/os',
        'content/e6s/rhel9/9.4/aarch64/appstream/source/SRPMS',
        'content/e6s/rhel9/9.4/ppc64le/appstream/debug',
        'content/e6s/rhel9/9.4/ppc64le/appstream/os',
        'content/e6s/rhel9/9.4/ppc64le/appstream/source/SRPMS',
        'content/e6s/rhel9/9.4/s390x/appstream/debug',
        'content/e6s/rhel9/9.4/s390x/appstream/os',
        'content/e6s/rhel9/9.4/s390x/appstream/source/SRPMS',
        'content/e6s/rhel9/9.4/x86_64/appstream/debug',
        'content/e6s/rhel9/9.4/x86_64/appstream/os',
        'content/e6s/rhel9/9.4/x86_64/appstream/source/SRPMS'
      ],
      'pkgs': [
        {'reference':'pg_repack-1.4.8-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'pgaudit-16.0-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgres-decoderbufs-2.4.0-1.Final.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-contrib-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-docs-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-plperl-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-plpython3-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-pltcl-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-private-devel-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-private-libs-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-server-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-server-devel-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-static-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-test-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-test-rpm-macros-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-upgrade-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'postgresql-upgrade-devel-16.14-1.module+el9.4.0', 'sp':'4', 'release':'9', 'rpm_spec_vers_cmp':TRUE}
      ]
    }
  ]
};

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints, appstreams:TRUE);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var module_ver = get_kb_item('Host/RedHat/appstream/postgresql');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module postgresql:16');
if ('16' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module postgresql:' + module_ver);

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;
var repo_relative_urls;
var appstreams_found = 0;
var appstream;
var appstream_name;
var appstream_version;
foreach var module (keys(constraints)) {
  appstream = NULL;
  appstream_name = NULL;
  appstream_version = NULL;
  appstream_split = split(module, sep:':', keep:FALSE);
  if (!empty_or_null(appstream_split)) {
    appstream_name = appstream_split[0];
    appstream_version = appstream_split[1];
    if (!empty_or_null(appstream_name)) appstream = get_one_kb_item('Host/RedHat/appstream/' + appstream_name);
  }
  if (!empty_or_null(appstream) && appstream_version == appstream || appstream_name == 'all') {
    appstreams_found++;
    foreach var module_array ( constraints[module] ) {
      # Check that the target release is equal to the affected release
      if (!empty_or_null(module_array['release'])){
        if (module_array['release'] != os_release) continue;
      }
      if (!empty_or_null(module_array['sp'])){
        if (module_array['sp'] != os_sp) continue;
      }
      repo_relative_urls = NULL;
      if (!empty_or_null(module_array['repo_relative_urls'])) repo_relative_urls = module_array['repo_relative_urls'];
      foreach var package_array ( module_array['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(package_array['reference'])) reference = package_array['reference'];
        if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
        if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
        if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
        if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
        if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
        if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
        if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
        if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
        if (reference &&
            rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
            (applicable_repo_urls || (!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 (!appstreams_found) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module postgresql:16');

if (flag)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Update Services for SAP Solutions repository.\n' +
    'Access to this repository requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'pg_repack / pgaudit / postgres-decoderbufs / postgresql / etc');
}