RockyLinux 8 : nginx:1.24 (RLSA-2026:18041)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# Rocky Linux Security Advisory RLSA-2026:18041.
##

include('compat.inc');

if (description)
{
  script_id(315181);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2026-42945");
  script_xref(name:"RLSA", value:"2026:18041");

  script_name(english:"RockyLinux 8 : nginx:1.24 (RLSA-2026:18041)");

  script_set_attribute(attribute:"synopsis", value:
"The remote RockyLinux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the
RLSA-2026:18041 advisory.

    * nginx: NGINX: Arbitrary Code Execution Vulnerability (CVE-2026-42945)

Tenable has extracted the preceding description block directly from the RockyLinux 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://errata.rockylinux.org/RLSA-2026:18041");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2477116");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/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:H/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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42945");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-all-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-filesystem");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-http-image-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-http-image-filter-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-http-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-http-perl-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-http-xslt-filter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-http-xslt-filter-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-mail");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-mail-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-stream");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:rocky:linux:nginx-mod-stream-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:rocky:linux:8");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Rocky 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/RockyLinux/release", "Host/RockyLinux/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) || 'Rocky Linux' >!< os_product) audit(AUDIT_OS_NOT, 'Rocky Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Rocky Linux');
if (! preg(pattern:"^8([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'RockyLinux 8.x', 'Rocky Linux ' + os_version);

if (!get_kb_item('Host/RockyLinux/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, 'Rocky Linux', cpu);

var module_ver = get_kb_item('Host/RockyLinux/appstream/nginx');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module nginx:1.24');
if ('1.24' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module nginx:' + module_ver);

var constraints = {
  'nginx:1.24': [
    {
      'release': '8',
      'pkgs': [
        {'reference':'nginx-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-all-modules-1.24.0-3.module+el8.10.0', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-all-modules-1.24.0-3.module+el8.10.0', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-debugsource-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-debugsource-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-debugsource-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-filesystem-1.24.0-3.module+el8.10.0', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-filesystem-1.24.0-3.module+el8.10.0', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-devel-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-devel-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-devel-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-devel-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-image-filter-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-perl-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-http-xslt-filter-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-mail-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-1.24.0-3.module+el8.10.0', 'cpu':'x86_64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-debuginfo-1.24.0-3.module+el8.10.0', 'cpu':'aarch64', 'el_string':'el8.10.0', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
        {'reference':'nginx-mod-stream-debuginfo-1.24.0-3.module+el8.10.0', '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/RockyLinux/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 nginx:1.24');
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, 'nginx / nginx-all-modules / nginx-debuginfo / nginx-debugsource / etc');
}