AlmaLinux 9 : httpd (ALSA-2026:41906)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2026:41906.
##

include('compat.inc');

if (description)
{
  script_id(328786);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/21");

  script_cve_id(
    "CVE-2024-42516",
    "CVE-2026-24072",
    "CVE-2026-29169",
    "CVE-2026-33006",
    "CVE-2026-34355",
    "CVE-2026-34356",
    "CVE-2026-42535",
    "CVE-2026-42536",
    "CVE-2026-43951",
    "CVE-2026-44119",
    "CVE-2026-44185",
    "CVE-2026-44186",
    "CVE-2026-44631"
  );
  script_xref(name:"ALSA", value:"2026:41906");
  script_xref(name:"RHSA", value:"2026:41906");

  script_name(english:"AlmaLinux 9 : httpd (ALSA-2026:41906)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2026:41906 advisory.

    * httpd: incomplete fix for CVE-2023-38709 (CVE-2024-42516)
      * Apache HTTP Server: mod_rewrite: Apache HTTP Server: Privilege Escalation via .htaccess file
    manipulation (CVE-2026-24072)
      * httpd: mod_auth_digest: timing attack allows a bypass of digest authentication (CVE-2026-33006)
      * httpd: NULL pointer dereference via specially crafted request (CVE-2026-29169)
      * 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 httpd mod_dav_fs: Denial of Service due to path handling issue (CVE-2026-42535)
      * 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)
      * httpd: Apache HTTP Server: Local .htaccess authors can read files with httpd user privileges
    (CVE-2026-44119)


    Bug Fix(es) and Enhancement(s):

      * address Moderate severity issues from httpd 2.4.68 [almalinux-9.8.z] (JIRA:AlmaLinux-184520)
      * mod_proxy_html regression in CVE-2026-34355 fix [almalinux-9.8.z] (JIRA:AlmaLinux-192752)

Tenable has extracted the preceding description block directly from the AlmaLinux 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://errata.almalinux.org/9/ALSA-2026-41906.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:41906");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42535");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-44631");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(120, 124, 125, 208, 22, 266, 476, 73, 835, 93);

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:httpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:httpd-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:httpd-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:httpd-filesystem");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:httpd-manual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:httpd-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:mod_ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:mod_lua");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:mod_proxy_html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:mod_session");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:mod_ssl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::appstream");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::baseos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::crb");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::highavailability");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::nfv");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::realtime");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::resilientstorage");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::sap");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::sap_hana");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::supplementary");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alma 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_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  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) || 'AlmaLinux' >!< os_product) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
if (! preg(pattern:"^9([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'AlmaLinux 9.x', 'AlmaLinux ' + os_version);

if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

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

var constraints = [
  {
    'release': '9',
    'pkgs': [
      {'reference':'httpd-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-core-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-core-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-core-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-core-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-devel-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-devel-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-devel-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-devel-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-filesystem-2.4.62-13.el9_8.5', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-manual-2.4.62-13.el9_8.5', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-tools-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-tools-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-tools-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'httpd-tools-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_ldap-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_ldap-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_ldap-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_ldap-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_lua-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_lua-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_lua-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_lua-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_proxy_html-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_proxy_html-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_proxy_html-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_proxy_html-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_session-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_session-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_session-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_session-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'mod_ssl-2.4.62-13.el9_8.5', 'cpu':'aarch64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_ssl-2.4.62-13.el9_8.5', 'cpu':'ppc64le', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_ssl-2.4.62-13.el9_8.5', 'cpu':'s390x', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'mod_ssl-2.4.62-13.el9_8.5', 'cpu':'x86_64', 'el_string':'el9_8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'}
    ]
  }
];

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, 'httpd / httpd-core / httpd-devel / httpd-filesystem / httpd-manual / etc');
}