AlmaLinux 8 : httpd:2.4 (ALSA-2026:92616)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2026:92616.
##

include('compat.inc');

if (description)
{
  script_id(376142);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/04");

  script_cve_id(
    "CVE-2026-33006",
    "CVE-2026-46729",
    "CVE-2026-48005",
    "CVE-2026-56153",
    "CVE-2026-56154",
    "CVE-2026-63045",
    "CVE-2026-63292",
    "CVE-2026-63686",
    "CVE-2026-63718",
    "CVE-2026-73636",
    "CVE-2026-73637",
    "CVE-2026-93546"
  );
  script_xref(name:"ALSA", value:"2026:92616");
  script_xref(name:"RHSA", value:"2026:92616");

  script_name(english:"AlmaLinux 8 : httpd:2.4 (ALSA-2026:92616)");

  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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2026:92616 advisory.

    * httpd: mod_auth_digest: timing attack allows a bypass of digest authentication (CVE-2026-33006)
      * httpd: httpd: HTTP response smuggling via crafted Transfer-Encoding response in mod_proxy_uwsgi
    (CVE-2026-63718)
      * httpd: httpd: Denial of Service via integer overflow in mod_dav_fs (CVE-2026-93546)
      * httpd: httpd: Authentication state corruption via concurrent Digest authentication requests
    (CVE-2026-73637)
      * httpd: httpd: unauthorized connection to arbitrary hosts via crafted FTP PASV response
    (CVE-2026-63045)
      * httpd: httpd: Arbitrary code execution via oversized Host header in mod_vhost_alias (CVE-2026-63292)
      * httpd: httpd: mod_heartmonitor: Denial of Service via NULL pointer dereference (CVE-2026-46729)
      * httpd: httpd: Authentication bypass via credential replay in mod_auth_digest (CVE-2026-73636)
      * httpd: httpd: Denial of Service via charset conversion failure in mod_xml2enc (CVE-2026-63686)
      * httpd: httpd: Denial of service via forged Authorization headers in mod_auth_digest (CVE-2026-48005)
      * httpd: httpd: Denial of Service via mod_rewrite lookahead (CVE-2026-56154)
      * httpd: httpd: Denial of Service via heap-based buffer overflow in mod_charset_lite (CVE-2026-56153)


    Bug Fix(es) and Enhancement(s):

      * mod_proxy_hcheck: passing health check does not recover worker from its standard error state
    (PROXY_WORKER_IN_ERROR) (JIRA:RHEL-256797)

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/8/ALSA-2026-92616.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:92616");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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: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-2026-56154");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(190, 208, 294, 303, 416, 444, 476, 787, 825, 918);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/04");

  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-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_http2");
  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_md");
  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:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::appstream");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::baseos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::highavailability");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::nfv");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::powertools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::realtime");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::resilientstorage");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap_hana");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::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_info2.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:"^8([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.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 module_ver = get_kb_item('Host/AlmaLinux/appstream/httpd');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module httpd:2.4');
if ('2.4' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module httpd:' + module_ver);

var constraints = {
  'httpd:2.4': [
    {
      'release': '8',
      'pkgs': [
        {'reference':'httpd-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-devel-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-devel-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-devel-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-devel-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-filesystem-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-manual-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-tools-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-tools-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-tools-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'httpd-tools-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_http2-1.15.7-10.module_el8.10.0+4233+8b7d9181.7', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_http2-1.15.7-10.module_el8.10.0+4233+8b7d9181.7', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_http2-1.15.7-10.module_el8.10.0+4233+8b7d9181.7', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_http2-1.15.7-10.module_el8.10.0+4233+8b7d9181.7', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_ldap-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_ldap-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_ldap-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_ldap-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_md-2.0.8-8.module_el8.10.0+4295+280de5aa.4', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_md-2.0.8-8.module_el8.10.0+4295+280de5aa.4', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_md-2.0.8-8.module_el8.10.0+4295+280de5aa.4', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_md-2.0.8-8.module_el8.10.0+4295+280de5aa.4', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_proxy_html-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_proxy_html-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_proxy_html-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_proxy_html-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_session-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_session-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_session-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_session-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
        {'reference':'mod_ssl-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_ssl-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'ppc64le', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_ssl-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'s390x', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'mod_ssl-2.4.37-65.module_el8.10.0+4332+2bef2e0d.13', 'cpu':'x86_64', 'el_string':'el8.10.0', '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;
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/AlmaLinux/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;
      }
      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 &&
            (!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 httpd:2.4');

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-devel / httpd-filesystem / httpd-manual / httpd-tools / etc');
}