AlmaLinux 9.6 [TuxCare] Security Update: tomcat / tomcat-admin-webapps / tomcat-docs-webapp / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1785497476)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(361241);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id(
    "CVE-2026-24880",
    "CVE-2026-25854",
    "CVE-2026-34483",
    "CVE-2026-53404",
    "CVE-2026-55955"
  );
  script_xref(name:"CLSA", value:"2026:1785497476");

  script_name(english:"AlmaLinux 9.6 [TuxCare] Security Update: tomcat / tomcat-admin-webapps / tomcat-docs-webapp / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1785497476)");

  script_set_attribute(attribute:"synopsis", value:
"The AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare
ALMALINUX9.6:CLSA-2026:1785497476 advisory.

  - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache
    Tomcat via invalid chunk extension. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from
    10.1.0-M1 through 10.1.52, from 9.0.0.M1 through 9.0.115, from 8.5.0 through 8.5.100, from 7.0.0 through
    7.0.109. Other, unsupported versions may also be affected. Users are recommended to upgrade to version
    11.0.20, 10.1.52 or 9.0.116, which fix the issue. (CVE-2026-24880)

  - Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the
    LoadBalancerDrainingValve. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from
    10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported
    versions may also be affected Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116,
    which fix the issue. (CVE-2026-25854)

  - Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache
    Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53,
    from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 ,
    which fix the issue. (CVE-2026-34483)

  - Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if
    the first condition in an OR chain matched, subsequent non-OR conditions were skipped. This issue affects
    Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through
    9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.
    Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.
    (CVE-2026-53404)

  - Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the
    EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through
    11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from
    7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which
    fixes the issue. (CVE-2026-55955)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/advisories/2026/clsa-2026_1785497476.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8dee50d3");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1785497476");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.6:CLSA-2026:1785497476.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  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:N/A:N");
  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:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/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-2026-34483");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-25854");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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/OS/extended-third-party", "Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (empty_or_null(third_party_support) || third_party_support != 'TuxCare') exit(0, 'TuxCare support not enabled.');

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:"^9.6([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'AlmaLinux 9.6', '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 ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);


var constraints = [
  {
    'release': '9',
    'sp': '6',
    'pkgs': [
      {'reference':'tomcat-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-admin-webapps-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-docs-webapp-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-el-3.0-api-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-jsp-2.3-api-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-lib-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-servlet-4.0-api-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'tomcat-webapps-9.0.87-3.el9_6.3.tuxcare.els12', 'sp':'6', 'el_string':'el9_6', '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, 'tomcat / tomcat-admin-webapps / tomcat-docs-webapp / etc');
}