Fedora 42 : nginx / nginx-mod-brotli / nginx-mod-fancyindex / etc (2025-8caa129b2e)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2025-8caa129b2e
#

include('compat.inc');

if (description)
{
  script_id(281630);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/03");

  script_cve_id("CVE-2025-53859");
  script_xref(name:"IAVA", value:"2025-A-0615");
  script_xref(name:"FEDORA", value:"2025-8caa129b2e");

  script_name(english:"Fedora 42 : nginx / nginx-mod-brotli / nginx-mod-fancyindex / etc (2025-8caa129b2e)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Fedora host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Fedora 42 host has packages installed that are affected by a vulnerability as referenced in the
FEDORA-2025-8caa129b2e advisory.

    Changes with nginx 1.28.1                                        23 Dec 2025

        *) Security: processing of a specially crafted login/password when using
           the none authentication method in the ngx_mail_smtp_module might
           cause worker process memory disclosure to the authentication server
           (CVE-2025-53859).

        *) Bugfix: a segmentation fault might occur in a worker process if the
           try_files directive and proxy_pass with a URI were used.

        *) Bugfix: in handling Host and :authority header lines with equal
           values when using HTTP/2; the bug had appeared in 1.17.9.

        *) Bugfix: in handling Host header lines with a port when using
           HTTP/3.

        *) Bugfix: an XCLIENT command didn't use the xtext encoding.
           Thanks to Igor Morgenstern of Aisle Research.

        *) Bugfix: in SSL certificate caching during reconfiguration.

        *) Bugfix: in delta-seconds processing in the Cache-Control backend
           response header line.

        *) Change: the native nginx/Windows binary release is now built using
           Windows SDK 10.

        *) Bugfix: nginx could not be built on NetBSD 10.0.

        *) Bugfix: in HTTP/3.

Tenable has extracted the preceding description block directly from the Fedora 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://bodhi.fedoraproject.org/updates/FEDORA-2025-8caa129b2e");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-53859");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/08/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:42");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx-mod-brotli");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx-mod-fancyindex");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx-mod-headers-more");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx-mod-modsecurity");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx-mod-naxsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:nginx-mod-vts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Fedora 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/RedHat/release", "Host/RedHat/rpm-list");

  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) || 'Fedora' >!< os_product) audit(AUDIT_OS_NOT, 'Fedora');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Fedora');
if (! preg(pattern:"^42([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'Fedora 42', 'Fedora ' + 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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Fedora', cpu);

var constraints = [
  {
    'release': '42',
    'pkgs': [
      {'reference':'nginx-1.28.1-1.fc42', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'nginx-mod-brotli-1.0.0~rc-4.fc42', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nginx-mod-fancyindex-0.5.2-13.fc42', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nginx-mod-headers-more-0.39-4.fc42', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nginx-mod-modsecurity-1.0.4-5.fc42', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nginx-mod-naxsi-1.6-12.fc42', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nginx-mod-vts-0.2.4-4.fc42', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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_NOTE,
      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-mod-brotli / nginx-mod-fancyindex / etc');
}