Security Updates for Exchange (October 2018)

#
# (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(118008);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/20");

  script_cve_id("CVE-2018-8265", "CVE-2018-8448");
  script_xref(name:"MSKB", value:"4459266");
  script_xref(name:"MSFT", value:"MS18-4459266");

  script_name(english:"Security Updates for Exchange (October 2018)");
  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 :

  - An elevation of privilege vulnerability exists when
    Microsoft Exchange Outlook Web Access (OWA) fails to
    properly handle web requests. An attacker who
    successfully exploited this vulnerability could perform
    script/content injection attacks and attempt to trick
    the user into disclosing sensitive information.
    (CVE-2018-8448)

  - A remote code execution vulnerability exists in the way
    Microsoft Exchange software parses specially crafted
    email messages. An attacker who successfully exploited
    the vulnerability could run arbitrary code in the
    context of the system user. An attacker could then
    install programs; view, change, add, or delete data.
    (CVE-2018-8265)");
  # https://support.microsoft.com/en-us/help/4459266/description-of-the-security-update-for-microsoft-exchange-server-2013
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3ade9314");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security update to address this
issue:
  -KB4459266");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:L/AC:L/PR:N/UI:R/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-2018-8265");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/10/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/09");

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

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

  script_copyright(english:"This script is Copyright (C) 2018-2021 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');

exit_if_productname_not_server();

bulletin = 'MS18-10';
kb = "4340731";
kbs = make_list(kb);

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

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

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

if (release != 150 && release != 151)
  audit(AUDIT_INST_VER_NOT_VULN, 'Exchange', version);

if (!empty_or_null(install["SP"]))
  sp = install["SP"];
if (!empty_or_null(install["CU"]))
  cu = install["CU"];

if ((release == 150 && cu != 21) ||
   (release == 151 && cu != 9 && cu != 10))
  audit(AUDIT_INST_VER_NOT_VULN, 'Exchange', version);

if (release == 150) # Exchange Server 2013
{
  if (cu == 21)
    fixedver = "15.0.1395.8";
}
else if (release == 151) # Exchange Server 2016
{
  if (cu == 9)
    fixedver = "15.1.1466.12";
  else if (cu == 10)
    fixedver = "15.1.1531.7";
}

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_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}