Vulnerabilities > CVE-2018-8636 - Unspecified vulnerability in Microsoft Excel and Office 365 Proplus

047910
CVSS 7.8 - HIGH
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
local
low complexity
microsoft
nessus

Summary

A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory, aka "Microsoft Excel Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Excel. This CVE ID is unique from CVE-2018-8597.

Nessus

NASL familyWindows : Microsoft Bulletins
NASL idSMB_NT_MS18_DEC_EXCEL.NASL
descriptionThe Microsoft Excel Products are missing security updates. It is, therefore, affected by multiple vulnerabilities : - An information disclosure vulnerability exists when Microsoft Excel software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bound memory. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel software. The security update addresses the vulnerability by properly initializing the affected variable. (CVE-2018-8627) - A remote code execution vulnerability exists in Microsoft Excel 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 current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2018-8597, CVE-2018-8636) - An information disclosure vulnerability exists when Microsoft Excel improperly discloses the contents of its memory. An attacker who exploited the vulnerability could use the information to compromise the users computer or data. (CVE-2018-8598)
last seen2020-06-01
modified2020-06-02
plugin id119592
published2018-12-11
reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/119592
titleSecurity Updates for Microsoft Excel Products (December 2018)
code
#
# (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(119592);
  script_version("1.5");
  script_cvs_date("Date: 2019/11/01");

  script_cve_id(
    "CVE-2018-8597",
    "CVE-2018-8598",
    "CVE-2018-8627",
    "CVE-2018-8636"
  );
  script_xref(name:"MSKB", value:"4461577");
  script_xref(name:"MSKB", value:"4461559");
  script_xref(name:"MSKB", value:"4461542");
  script_xref(name:"MSFT", value:"MS18-4461577");
  script_xref(name:"MSFT", value:"MS18-4461559");
  script_xref(name:"MSFT", value:"MS18-4461542");

  script_name(english:"Security Updates for Microsoft Excel Products (December 2018)");
  script_summary(english:"Checks for Microsoft security updates.");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Excel Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Excel Products are missing security updates.
It is, therefore, affected by multiple vulnerabilities :

  - An information disclosure vulnerability exists when
    Microsoft Excel software reads out of bound memory due
    to an uninitialized variable, which could disclose the
    contents of memory. An attacker who successfully
    exploited the vulnerability could view out of bound
    memory. Exploitation of the vulnerability requires that
    a user open a specially crafted file with an affected
    version of Microsoft Excel software. The security update
    addresses the vulnerability by properly initializing the
    affected variable. (CVE-2018-8627)

  - A remote code execution vulnerability exists in
    Microsoft Excel 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 current user. If
    the current user is logged on with administrative user
    rights, an attacker could take control of the affected
    system. An attacker could then install programs; view,
    change, or delete data; or create new accounts with full
    user rights.  (CVE-2018-8597, CVE-2018-8636)

  - An information disclosure vulnerability exists when
    Microsoft Excel improperly discloses the contents of its
    memory. An attacker who exploited the vulnerability
    could use the information to compromise the users
    computer or data.  (CVE-2018-8598)");
  # https://support.microsoft.com/en-us/help/4461577/descriptionofthesecurityupdateforexcel2010december112018
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4da77a07");
  # https://support.microsoft.com/en-us/help/4461559/descriptionofthesecurityupdateforexcel2013december112018
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1a46fea2");
  # https://support.microsoft.com/en-us/help/4461542/descriptionofthesecurityupdateforexcel2016december112018
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c7581dff");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB4461577
  -KB4461559
  -KB4461542");
  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-2018-8636");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/12/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/11");

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

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

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("office_installed.nasl", "microsoft_office_compatibility_pack_installed.nbin", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  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("smb_reg_query.inc");
include("install_func.inc");

global_var vuln;

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = "MS18-12";
kbs = make_list(
'4461577',
'4461559',
'4461542'
);

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

get_kb_item_or_exit("SMB/Registry/Enumerated", exit_code:1);

port = kb_smb_transport();

checks = make_array(
  "14.0", make_array("sp", 2, "version", "14.0.7225.5000", "kb", "4461577"),
  "15.0", make_array("sp", 1, "version", "15.0.5093.1000", "kb", "4461559"),
  "16.0", make_nested_list(
    make_array("sp", 0, "version", "16.0.4783.1000", "channel", "MSI", "kb", "4461542"),
    # C2R
    make_array("sp", 0, "version", "16.0.8431.2351", "channel", "Deferred"),
    make_array("sp", 0, "version", "16.0.9126.2336", "channel", "Deferred", "channel_version", "1803"),
    make_array("sp", 0, "version", "16.0.10730.20262", "channel", "First Release for Deferred"),
    make_array("sp", 0, "version", "16.0.11029.20108", "channel", "Current"),
    # 2019
    make_array("sp", 0, "version", "16.0.11029.20108", "channel", "2019 Retail"),
    make_array("sp", 0, "version", "16.0.10339.20026", "channel", "2019 Volume")
  )
);

if (hotfix_check_office_product(product:"Excel", checks:checks, bulletin:bulletin))
{
  replace_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');
}