Vulnerabilities > CVE-2020-0652 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Excel and Office 365 Proplus

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
microsoft
CWE-119
nessus
NVD
Published: 2020-01-14
Updated: 2021-07-21

Summary

A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory, aka 'Microsoft Office Memory Corruption Vulnerability'.

Vulnerable Configurations

Part Description Count
Application
Microsoft
6

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

NASL familyWindows : Microsoft Bulletins
NASL idSMB_NT_MS20_JAN_OFFICE.NASL
descriptionThe Microsoft Office Products are missing a security update. It is, therefore, affected by the following vulnerability: - A remote code execution vulnerability exists in Microsoft Office 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.
last seen2020-06-01
modified2020-06-02
plugin id132869
published2020-01-14
reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/132869
titleSecurity Updates for Microsoft Office Products (January 2020)
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(132869);
  script_version("1.6");
  script_cvs_date("Date: 2020/01/30");

  script_cve_id("CVE-2020-0652");
  script_xref(name:"MSKB", value:"4484221");
  script_xref(name:"MSKB", value:"4484227");
  script_xref(name:"MSKB", value:"4484236");
  script_xref(name:"MSFT", value:"MS20-4484221");
  script_xref(name:"MSFT", value:"MS20-4484227");
  script_xref(name:"MSFT", value:"MS20-4484236");
  script_xref(name:"IAVA", value:"2020-A-0029");

  script_name(english:"Security Updates for Microsoft Office Products (January 2020)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office Products are missing a security update. It is, therefore, affected by the following vulnerability:

  - A remote code execution vulnerability exists in Microsoft Office 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.");
  # https://support.microsoft.com/en-us/help/4484236/security-update-for-office-2010-january-14-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1611bdcd");
  # https://support.microsoft.com/en-us/help/4484227/security-update-for-office-2013-january-14-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d8161b35");
  # https://support.microsoft.com/en-us/help/4484221/security-update-for-office-2016-january-14-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ff8ceaff");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB4484221
  -KB4484227
  -KB4484236
  
For Office 365, Office 2016 C2R, or Office 2019, ensure automatic updates are enabled or open any office app and
manually perform an update.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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-2020-0652");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/14");

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

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

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("office_installed.nasl", "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('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');
include('install_func.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

bulletin = 'MS20-01';
kbs = make_list(
  '4484236',  # Office 2010 SP2
  '4484227',  # Office 2013 SP1
  '4484221'   # Office 2016
);

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

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

vuln = FALSE;
port = kb_smb_transport();

office_vers = hotfix_check_office_version();

# Office 2010 SP2
if (office_vers['14.0'])
{
  office_sp = get_kb_item('SMB/Office/2010/SP');
  if (!isnull(office_sp) && office_sp == 2)
  {
    prod = 'Microsoft Office 2010 SP2';

    path = hotfix_get_officeprogramfilesdir(officever:'14.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office14');
    kb = '4484236';
    file = 'graph.exe';
    version = '14.0.7244.5000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
  }
}

# Office 2013 SP1
if (office_vers['15.0'])
{
  office_sp = get_kb_item('SMB/Office/2013/SP');
  if (!isnull(office_sp) && office_sp == 1)
  {
    prod = 'Microsoft Office 2013 SP1';

    path = hotfix_get_officeprogramfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office15');
    kb = '4484227';
    file = 'graph.exe';
    version = '15.0.5207.1000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;
  }
}

# Office 2016 / 2019 / C2R
if (office_vers['16.0'])
{
  office_sp = get_kb_item('SMB/Office/2016/SP');
  if (!isnull(office_sp) && office_sp == 0)
  {
    prod = 'Microsoft Office 2016';

    path = hotfix_get_officeprogramfilesdir(officever:'16.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office16');

    # MSI graph.exe
    if (hotfix_check_fversion(file:'graph.exe', version:'16.0.4954.1000', channel:'MSI', channel_product:'Office', path:path, kb:'4484221', bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;

    path = hotfix_get_officeprogramfilesdir(officever:'16.0');
    prod2019 = 'Microsoft Office 2019';
    mso_dll_path = hotfix_append_path(path:path, value:'Microsoft Office\\root\\Office16');
    c2r_path = mso_dll_path;
    if (
      hotfix_check_fversion(file:"graph.exe", version:"16.0.10730.20432", channel:"Deferred", channel_product:"Office", path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      hotfix_check_fversion(file:"graph.exe", version:"16.0.11328.20512", channel:"Deferred", channel_version:"1902", channel_product:"Office", path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      hotfix_check_fversion(file:"graph.exe", version:"16.0.11929.20562", channel:"First Release for Deferred", channel_product:"Office", path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      hotfix_check_fversion(file:"graph.exe", version:"16.0.12325.20298", channel:"Current", channel_product:"Office", path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      # 2019
      hotfix_check_fversion(file:"graph.exe", version:"16.0.12325.20298", channel:"2019 Retail", channel_product:"Office", path:c2r_path, bulletin:bulletin, product:prod2019) == HCF_OLDER ||
      hotfix_check_fversion(file:"graph.exe", version:"16.0.10354.20022", channel:"2019 Volume", channel_product:"Office", path:c2r_path, bulletin:bulletin, product:prod2019) == HCF_OLDER
    ) vuln = TRUE;
  }
}

if (vuln)
{
  replace_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');
}

References