Security Updates for Exchange (May 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(109684);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/20");

  script_cve_id(
    "CVE-2018-8151",
    "CVE-2018-8152",
    "CVE-2018-8153",
    "CVE-2018-8154",
    "CVE-2018-8159"
  );
  script_bugtraq_id(
    104042,
    104043,
    104045,
    104054,
    104056
  );
  script_xref(name:"MSKB", value:"4091243");
  script_xref(name:"MSKB", value:"4092041");
  script_xref(name:"MSFT", value:"MS18-4091243");
  script_xref(name:"MSFT", value:"MS18-4092041");

  script_name(english:"Security Updates for Exchange (May 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 information disclosure vulnerability exists when
    Microsoft Exchange improperly handles objects in memory.
    An attacker who successfully exploited this
    vulnerability could obtain information to further
    compromise the remote system.  (CVE-2018-8151)

  - A remote code execution vulnerability exists in
    Microsoft Exchange software when the software fails to
    properly handle objects in memory. 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, or
    delete data; or create new accounts. 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 handles objects in memory.
    (CVE-2018-8154)

  - 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-2018-8159)

  - A spoofing vulnerability exists in Microsoft Exchange
    Server when Outlook Web Access (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 be used as a pivot to chain an attack
    with other vulnerabilities in web services.
    (CVE-2018-8153)

  - 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-2018-8152)");
  # https://support.microsoft.com/en-us/help/4091243/update-rollup-21-for-exchange-server-2010-service-pack-3
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d6cc4f2b");
  # https://support.microsoft.com/en-us/help/4092041/description-of-the-security-update-for-microsoft-exchange-server-2013
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cc955952");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB4091243
  -KB4092041");
  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-2018-8154");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/05/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/05/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/05/10");

  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 = 'MS18-05';
kb = "4092041";
kb2 = "4091243";
kbs = make_list(kb, kb2);

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 != 140 && 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 == 140 && sp != 3) ||
   (release == 150 && cu != 4 && cu != 19 && cu != 20) ||
   (release == 151 && cu != 8 && cu != 9))
  audit(AUDIT_INST_VER_NOT_VULN, 'Exchange', version);

if (release == 140) # Exchange Server 2010 SP3
{
  fixedver = "14.3.399.2";
}

if (release == 150) # Exchange Server 2013
{
  if (cu == 4)
    fixedver = "15.0.847.62";
  else if (cu == 19)
    fixedver = "15.0.1365.7";
  else if (cu == 20)
    fixedver = "15.0.1367.6";
}
else if (release == 151) # Exchange Server 2016
{
  if (cu == 8)
    fixedver = "15.1.1415.7";
  else if (cu == 9)
    fixedver = "15.1.1466.8";
}

if (fixedver && release == 140 && hotfix_is_vulnerable(path:hotfix_append_path(path:path, value:"Bin"), file:"ExSetup.exe", version:fixedver, bulletin:bulletin, kb:kb2))
{
  set_kb_item(name:'SMB/Missing/' + bulletin, value:TRUE);
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else 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');
}