IBM WebSphere Application Server 9.x < 9.0.5.30 (7292227)

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

include('compat.inc');

if (description)
{
  script_id(379784);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/12");

  script_cve_id("CVE-2026-84375");

  script_name(english:"IBM WebSphere Application Server 9.x < 9.0.5.30 (7292227)");

  script_set_attribute(attribute:"synopsis", value:
"The remote web application server is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of IBM WebSphere Application Server running on the remote host is affected by a vulnerability as referenced
in the 7292227 advisory.

  - js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1,
    maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while
    processing the merge key <<. An attacker can alias a large sequence of empty mappings into many merge
    targets, causing O(N * K) processing while totalMergeKeys remains unchanged and the configured resource
    limit is never reached. A relatively small YAML document can therefore cause prolonged CPU consumption in
    applications that parse untrusted YAML, and merge processing is enabled by default on these release lines.
    In v3 & v4, merge is enabled by default so the severity score is higher. This issue is fixed in versions
    3.15.2, 4.3.2, and 5.4.1. (CVE-2026-84375)

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://www.ibm.com/support/pages/node/7292227");
  script_set_attribute(attribute:"solution", value:
"Update to IBM WebSphere Application Server version 9.0.5.30 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-84375");

  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:"2026/09/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/12");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:websphere_application_server");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("websphere_detect.nasl", "ibm_enum_products.nbin", "ibm_websphere_application_server_nix_installed.nbin", "ibm_websphere_application_server_win_installed.nbin");
  script_require_keys("installed_sw/IBM WebSphere Application Server");

  exit(0);
}

include('vcf.inc');

var app = 'IBM WebSphere Application Server';
var app_info = vcf::combined_get_app_info(app:app);
vcf::check_granularity(app_info:app_info, sig_segments:4);

# If the detection is only remote, Source will be set, and we should require paranoia
var require_paranoid = FALSE;
if (!empty_or_null(app_info['Source']) && app_info['Source'] != 'unknown' && report_paranoia < 2)
  require_paranoid = TRUE;


var constraints = [
  { 'min_version' : '9.0.0.0', 'fixed_version' : '9.0.5.30' }
];

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    require_paranoia:require_paranoid,
    severity:SECURITY_HOLE
);