RHEL 9 : httpd (RHSA-2026:66323)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:66323. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(344535);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/10");

  script_cve_id(
    "CVE-2024-42516",
    "CVE-2026-28780",
    "CVE-2026-29167",
    "CVE-2026-29169",
    "CVE-2026-33007",
    "CVE-2026-33857",
    "CVE-2026-34032",
    "CVE-2026-34059",
    "CVE-2026-34355",
    "CVE-2026-34356",
    "CVE-2026-42536",
    "CVE-2026-43951",
    "CVE-2026-44185",
    "CVE-2026-44186",
    "CVE-2026-44631"
  );
  script_xref(name:"RHSA", value:"2026:66323");

  script_name(english:"RHEL 9 : httpd (RHSA-2026:66323)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for httpd.");
  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-2026:66323 advisory.

    The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

    Security Fix(es):

    * httpd: incomplete fix for CVE-2023-38709 (CVE-2024-42516)

    * httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()
    (CVE-2026-34059)

    * httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)

    * httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)

    * httpd: NULL pointer dereference via specially crafted request (CVE-2026-29169)

    * httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)

    * Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-
    based buffer overflow (CVE-2026-28780)

    * httpd: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap
    per-directory configuration (CVE-2026-29167)

    * httpd: Apache HTTP Server: Heap-based Buffer Overflow via malicious backend servers (CVE-2026-34356)

    * httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server
    (CVE-2026-44185)

    * httpd: Apache HTTP Server: Denial of Service via crafted regular expressions (CVE-2026-44631)

    * httpd: Apache HTTP Server: Denial of Service in mod_proxy_ftp via attacker-controlled FTP server
    (CVE-2026-44186)

    * httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
    (CVE-2026-42536)

    * httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass (CVE-2026-34355)

    * httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)

    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=2374549");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2464940");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2464952");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2464953");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2465296");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2465299");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2466913");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486394");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486395");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486397");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486399");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486402");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486411");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486414");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2486415");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_66323.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d17260f0");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:66323");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL httpd package based on the guidance in RHSA-2026:66323.");
  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-2026-44631");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(93, 120, 124, 125, 126, 170, 476, 787, 825, 835);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/10");

  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:httpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:httpd-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mod_ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mod_proxy_html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mod_ssl");
  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 = [
  {
    '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':'httpd-core-2.4.57-11.el9_4.5', 'sp':'4', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2024-42516', 'CVE-2026-28780', 'CVE-2026-29169', 'CVE-2026-33007', 'CVE-2026-33857', 'CVE-2026-34032', 'CVE-2026-34059', 'CVE-2026-34356', 'CVE-2026-43951', 'CVE-2026-44186', 'CVE-2026-44631']},
      {'reference':'mod_ldap-2.4.57-11.el9_4.5', 'sp':'4', 'rpm_spec_vers_cmp':TRUE, 'cves':['CVE-2026-29167']},
      {'reference':'mod_proxy_html-2.4.57-11.el9_4.5', 'sp':'4', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1', 'cves':['CVE-2026-34355', 'CVE-2026-42536']},
      {'reference':'mod_ssl-2.4.57-11.el9_4.5', 'sp':'4', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1', 'cves':['CVE-2026-44185']}
    ]
  }
];

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

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 repo_relative_urls;
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;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  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 &&
        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 (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, 'httpd-core / mod_ldap / mod_proxy_html / mod_ssl');
}