Vulnerabilities > CVE-2019-1233 - Unspecified vulnerability in Microsoft Exchange Server 2016/2019

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

# The descriptive text and package checks in this plugin were  
# extracted from the Microsoft Security Updates API. The text
# itself is copyright (C) Microsoft Corporation.


include("compat.inc");

if (description)
{
  script_id(128707);
  script_version("1.5");
  script_cvs_date("Date: 2019/11/08");

  script_cve_id("CVE-2019-1233", "CVE-2019-1266");
  script_xref(name:"MSKB", value:"4515832");
  script_xref(name:"MSFT", value:"MS19-4515832");
  script_xref(name:"IAVA", value:"2019-A-0337");

  script_name(english:"Security Updates for Exchange (September 2019)");
  script_summary(english:"Checks for Microsoft security updates.");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Exchange Server installed on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Exchange Server installed on the remote host
is missing security updates. It is, therefore, affected by
multiple vulnerabilities :

  - A spoofing vulnerability exists in Microsoft Exchange
    Server when Outlook Web App (OWA) fails to properly
    handle web requests. An attacker who successfully
    exploited the vulnerability could perform script or
    content injection attacks, and attempt to trick the user
    into disclosing sensitive information. An attacker could
    also redirect the user to a malicious website that could
    spoof content or the vulnerability could be used as a
    pivot to chain an attack with other vulnerabilities in
    web services.  (CVE-2019-1266)

  - A denial of service vulnerability exists in Microsoft
    Exchange Server software when the software fails to
    properly handle objects in memory. An attacker who
    successfully exploited the vulnerability could cause a
    remote denial of service against a system. Exploitation
    of the vulnerability requires that a specially crafted
    email be sent to a vulnerable Exchange server. The
    security update addresses the vulnerability by
    correcting how Microsoft Exchange Server handles objects
    in memory. (CVE-2019-1233)");
  # https://support.microsoft.com/en-us/help/4515832/security-update-for-exchange-server-2019-and-2016
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fe045c39");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released KB4515832 to address this issue.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/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:L/PR:N/UI:R/S:C/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-1266");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:exchange_server");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ms_bulletin_checks_possible.nasl", "microsoft_exchange_installed.nbin");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('audit.inc');
include('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('misc_func.inc');
include('install_func.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

bulletin = 'MS19-09';
kbs = make_list(
  '4515832' # Exchange Server 2019 CU 1-2 / 2016 CU 12-13
);

if (get_kb_item('Host/patch_management_checks')) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_WARNING);

install = get_single_install(app_name:'Microsoft Exchange');

path = install['path'];
version = install['version'];
release = install['RELEASE'];

if (
  release != 151 &&
  release != 152
)  audit(AUDIT_INST_VER_NOT_VULN, 'Exchange', version);

if (!empty_or_null(install['CU']))
  cu = install['CU'];

if (release == 151) # Exchange Server 2016
{
  if (cu == 12)
  {
    fixedver = '15.1.1713.9';
    kb = '4515832';
  }
  else if (cu == 13)
  {
    fixedver = '15.1.1779.5';
    kb = '4515832';
  }
}
else if (release == 152) # Exchange Server 2019
{
  if (cu == 1)
  {
    fixedver = '15.2.330.10';
    kb = '4515832';
  }
  else if (cu == 2)
  {
    fixedver = '15.2.397.6';
    kb = '4515832';
  }
}

if (
  fixedver &&
  hotfix_is_vulnerable(path:hotfix_append_path(path:path, value:"Bin"), file:'ExSetup.exe', version:fixedver, bulletin:bulletin, kb:kb)
)
{
  set_kb_item(name:'SMB/Missing/' + bulletin, value:TRUE);
  hotfix_security_warning();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}