IBM WebSphere Application Server 8.5.x < 8.5.5.18 / 9.0.x < 9.0.5.5 RCE (CVE-2020-4450)

#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(137368);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/11/30");

  script_cve_id("CVE-2020-4450");
  script_xref(name:"IAVA", value:"2020-A-0254-S");

  script_name(english:"IBM WebSphere Application Server 8.5.x < 8.5.5.18 / 9.0.x < 9.0.5.5 RCE (CVE-2020-4450)");

  script_set_attribute(attribute:"synopsis", value:
"The remote web application server is affected by a remote code execution vulnerability");
  script_set_attribute(attribute:"description", value:
"The IBM WebSphere Application Server running on the remote host is version 8.5.x prior to 8.5.5.18 or 9.0.x  prior to
9.0.5.5. It is, therefore, affected by a remote code execution vulnerability. A remote, unauthenticated attacker can
exploit this by sending a specially-crafted sequence of serialized objects in order to execute arbitrary code on the
affected system.

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://exchange.xforce.ibmcloud.com/vulnerabilities/181231");
  script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/6220294");
  script_set_attribute(attribute:"solution", value:
"Upgrade to IBM WebSphere Application Server 8.5.5.18, 9.0.5.5, or later. Alternatively, upgrade to the minimal fix pack
levels required by the interim fix and then apply Interim Fix PH25074.");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-4450");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/06/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/12");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:websphere_application_server");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");
  script_copyright(english:"This script is Copyright (C) 2020 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");
  script_require_keys("installed_sw/IBM WebSphere Application Server");

  exit(0);
}

include('vcf.inc');


app = 'IBM WebSphere Application Server';
fix = 'Interim Fix PH25074';

get_install_count(app_name:app, exit_if_zero:TRUE);
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
if (!empty_or_null(app_info['Source']) && app_info['Source'] != 'unknown' && report_paranoia < 2)
  audit(AUDIT_PARANOID);

if ('PH25074' >< app_info['Fixes'])
  audit(AUDIT_INST_VER_NOT_VULN, app);

constraints = [
  {'min_version':'9.0.0.0', 'max_version':'9.0.5.4', 'fixed_display':'9.0.5.5 or 9.0.5.4 ' + fix},
  {'min_version':'8.5.0.0', 'max_version':'8.5.5.17', 'fixed_display':'8.5.5.18 or 8.5.5.17 ' + fix},
];

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