Vulnerabilities > CVE-2017-8502 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Excel 2010/2013/2016

047910
CVSS 9.3 - CRITICAL
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
microsoft
CWE-119
critical
nessus
NVD
Published: 2017-07-11
Updated: 2017-07-14

Summary

Microsoft Office allows a remote code execution vulnerability due to the way that it handles objects in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8501.

Vulnerable Configurations

Part Description Count
Application
Microsoft
4

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_MS17_JUL_OFFICE.NASL
descriptionThe Microsoft Office application, Microsoft Office Compatibility Pack, or Microsoft Excel Viewer installed on the remote Windows host is missing a security update. It is, therefore, affected by multiple remote code execution vulnerabilities due to improper handling of objects in memory. An unauthenticated, remote attacker can exploit these vulnerabilities, by convincing a user to open a specially crafted document or to visit a specially crafted website, to execute arbitrary code in the context of the current user. Note that KB2880514 for Office 2007 and KB3203468 for Office 2010 SP2 are only applicable to Office installations with the Galician language pack installed.
last seen2020-06-01
modified2020-06-02
plugin id101371
published2017-07-11
reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/101371
titleSecurity Update for Microsoft Office Products (July 2017)
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(101371);
  script_version("1.13");
  script_cvs_date("Date: 2019/11/12");

  script_cve_id(
    "CVE-2017-0243",
    "CVE-2017-8501",
    "CVE-2017-8502",
    "CVE-2017-8570"
  );
  script_bugtraq_id(
    99441,
    99442,
    99445,
    99446
  );
  script_xref(name:"MSKB", value:"2880514");
  script_xref(name:"MSFT", value:"MS17-2880514");
  script_xref(name:"MSKB", value:"3191833");
  script_xref(name:"MSFT", value:"MS17-3191833");
  script_xref(name:"MSKB", value:"3191894");
  script_xref(name:"MSFT", value:"MS17-3191894");
  script_xref(name:"MSKB", value:"3191897");
  script_xref(name:"MSFT", value:"MS17-3191897");
  script_xref(name:"MSKB", value:"3191907");
  script_xref(name:"MSFT", value:"MS17-3191907");
  script_xref(name:"MSKB", value:"3203468");
  script_xref(name:"MSFT", value:"MS17-3203468");
  script_xref(name:"MSKB", value:"3203477");
  script_xref(name:"MSFT", value:"MS17-3203477");
  script_xref(name:"MSKB", value:"3213537");
  script_xref(name:"MSFT", value:"MS17-3213537");
  script_xref(name:"MSKB", value:"3213545");
  script_xref(name:"MSFT", value:"MS17-3213545");
  script_xref(name:"MSKB", value:"3213555");
  script_xref(name:"MSFT", value:"MS17-3213555");
  script_xref(name:"MSKB", value:"3213624");
  script_xref(name:"MSFT", value:"MS17-3213624");
  script_xref(name:"MSKB", value:"3213640");
  script_xref(name:"MSFT", value:"MS17-3213640");

  script_name(english:"Security Update for Microsoft Office Products (July 2017)");
  script_summary(english:"Checks the file versions.");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote Windows host is affected by
multiple remote code execution vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office application, Microsoft Office Compatibility Pack,
or Microsoft Excel Viewer installed on the remote Windows host is
missing a security update. It is, therefore, affected by multiple
remote code execution vulnerabilities due to improper handling of
objects in memory. An unauthenticated, remote attacker can exploit
these vulnerabilities, by convincing a user to open a specially
crafted document or to visit a specially crafted website, to execute
arbitrary code in the context of the current user.

Note that KB2880514 for Office 2007 and KB3203468 for Office 2010 SP2
are only applicable to Office installations with the Galician language
pack installed.");
  script_set_attribute(attribute:"see_also", value:"https://portal.msrc.microsoft.com/en-us/security-guidance/summary");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Microsoft Office 2007,
2010, 2013, and 2016; Microsoft Excel 2007, 2010, 2013, and 2016;
Microsoft Excel Viewer 2007; and Microsoft Office Compatibility Pack.");
  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:H/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:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-8570");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/11");

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

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

  script_copyright(english:"This script is Copyright (C) 2017-2019 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("misc_func.inc");
include("install_func.inc");

global_var vuln;

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = "MS17-07";
kbs = make_list(
  '2880514', # Office 2007 SP3
  '3191833', # Excel Viewer 2007 SP3
  '3191894', # Excel 2007 SP3
  '3191897', # Office Compatibility Pack SP3
  '3191907', # Excel 2010 SP2
  '3203468', # Office 2010 SP2
  '3203477', # Excel 2016
  '3213537', # Excel 2013 SP1
  '3213545', # Office 2016
  '3213555', # Office 2013 SP1
  '3213624', # Office 2010 SP2
  '3213640'  # Office 2007 SP3
);

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);

vuln = FALSE;
port = kb_smb_transport();

######################################################################
# Office 2007, 2010, 2013, 2016
######################################################################
function perform_office_checks()
{
  local_var office_vers, office_sp, path, prod, file, kb;
  office_vers = hotfix_check_office_version();

  ####################################################################
  # Office 2007 SP3 Checks
  ####################################################################
  if (office_vers["12.0"])
  {
    office_sp = get_kb_item("SMB/Office/2007/SP");
    if (!isnull(office_sp) && office_sp == 3)
    {
      prod = "Microsoft Office 2007 SP3";
      path = hotfix_append_path(
        path  : hotfix_get_officecommonfilesdir(officever:"12.0"),
        value : "Microsoft Shared\Office12"
      );
      if (hotfix_check_fversion(file:"mso.dll", version:"12.0.6772.5000", path:path, kb:"3213640", bulletin:bulletin, product:prod) == HCF_OLDER)
        vuln = TRUE;
    }
  }

  ####################################################################
  # Office 2010 SP2 Checks
  ####################################################################
  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_append_path(
        path  : hotfix_get_officecommonfilesdir(officever:"14.0"),
        value : "Microsoft Shared\Office14"
      );
      if (hotfix_check_fversion(file:"mso.dll", version:"14.0.7184.5000", path:path, kb:"3213624", bulletin:bulletin, product:prod) == HCF_OLDER)
        vuln = TRUE;
    }
  }

  ####################################################################
  # Office 2013 SP1 Checks
  ####################################################################
  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_append_path(
        path  : hotfix_get_officecommonfilesdir(officever:"15.0"),
        value : "Microsoft Shared\Office15"
      );
      if (hotfix_check_fversion(file:"mso.dll", version:"15.0.4945.1001", path:path, kb:"3213555", bulletin:bulletin, product:prod) == HCF_OLDER)
        vuln = TRUE;
    }
  }

  ####################################################################
  # Office 2016 Checks
  ####################################################################
  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_append_path(
        path  : hotfix_get_officecommonfilesdir(officever:"16.0"),
        value : "Microsoft Shared\Office16"
      );
      kb   = "3213545";
      file = "mso30win32client.dll";
      if (
        hotfix_check_fversion(file:file, version:"16.0.4561.1002", channel:"MSI", channel_product:"Office", path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER ||
        hotfix_check_fversion(file:file, version:"16.0.7329.1062", channel:"Deferred", channel_product:"Office", path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER ||
        hotfix_check_fversion(file:file, version:"16.0.7726.1049", channel:"Deferred", channel_version:"1701", channel_product:"Office", path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER ||
        hotfix_check_fversion(file:file, version:"16.0.8201.2136", channel:"First Release for Deferred", channel_product:"Office", path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER ||
        hotfix_check_fversion(file:file, version:"16.0.8229.2086", channel:"Current", channel_product:"Office", path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER
      )
        vuln = TRUE;
    }
  }
}

function perform_proof_checks()
{
  var prod, path, paths;

  # The product code for Microsoft Office Proof (Galician) 2007 is
  # {90120000-001F-0456-0000-0000000FF1CE}
  var proof_gl_es_2007_ver = get_kb_item("SMB/Registry/HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/{90120000-001F-0456-0000-0000000FF1CE}/DisplayVersion");

  # The product codes for Microsoft Office Proof (Galician) 2010 are
  # {90140000-001F-0456-0000-0000000FF1CE} (x86)
  # {90140000-001F-0456-1000-0000000FF1CE} (x64)
  var proof_gl_es_2010_x86_ver = get_kb_item("SMB/Registry/HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/{90140000-001F-0456-0000-0000000FF1CE}/DisplayVersion");
  var proof_gl_es_2010_x64_ver = get_kb_item("SMB/Registry/HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/{90140000-001F-0456-1000-0000000FF1CE}/DisplayVersion");

  if(isnull(proof_gl_es_2007_ver) && isnull(proof_gl_es_2010_x86_ver) &&
     isnull(proof_gl_es_2010_x64_ver))
    return NULL;

  ####################################################################
  # Microsoft Office Proof (Galician) 2007
  ####################################################################
  # KB2880514 requires product version 12.0.6612.1000 (SP3)
  if(!isnull(proof_gl_es_2007_ver) && proof_gl_es_2007_ver == "12.0.6612.1000")
  {
    prod = "Microsoft Office Proof 2007 SP3";
    path = hotfix_append_path(
             path  : hotfix_get_officecommonfilesdir(officever:"12.0"),
             value : "\Microsoft Shared\PROOF"
    );
    if (hotfix_check_fversion(file:"mssp3gl.dll", version:"15.0.4569.1503", path:path, kb:"2880514", bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
  }

  ####################################################################
  # Microsoft Office Proof (Galician) 2010
  ####################################################################
  # KB 3203468 requires product version 14.0.7015.1000 (SP2)
  if(
      ( !isnull(proof_gl_es_2010_x86_ver) &&
        proof_gl_es_2010_x86_ver == "14.0.7015.1000" ) ||
      ( !isnull(proof_gl_es_2010_x64_ver) &&
        proof_gl_es_2010_x64_ver == "14.0.7015.1000" )
  )
  {
    # The PROOF folder is in the Microsoft Office folder for 2010
    # Proofing tools can be installed with an Office program, Visio,
    # or Project, so check all unique Office paths
    prod = "Microsoft Office Proof 2010 SP2";
    paths = get_kb_list('SMB/Office/*/14.0/Path');
    if(!isnull(paths))
    {
      paths = list_uniq(make_list(paths));
      foreach path (paths)
      {
        path = hotfix_append_path(
                 path  : path,
                 value : "\PROOF"
        );
        if (hotfix_check_fversion(file:"mssp3gl.dll", version:"15.0.4569.1503", path:path, kb:"3203468", bulletin:bulletin, product:prod) == HCF_OLDER)
          vuln = TRUE;
      }
    }
  }
}

######################################################################
# Excel 2007, 2010, 2013, 2016
######################################################################
function perform_excel_checks()
{
  local_var excel_checks, kb16;

  kb16 = "3203477";
  excel_checks = make_array(
    "12.0", make_array("sp", 3, "version", "12.0.6771.5000", "kb", "3191894"),
    "14.0", make_array("sp", 2, "version", "14.0.7183.5000", "kb", "3191907"),
    "15.0", make_array("sp", 1, "version", "15.0.4945.1000", "kb", "3213537"),
    "16.0", make_nested_list(
      make_array("sp", 0, "version", "16.0.4561.1000", "channel", "MSI", "kb", kb16),
      make_array("sp", 0, "version", "16.0.7369.2151", "channel", "Deferred", "kb", kb16),
      make_array("sp", 0, "version", "16.0.7766.2096", "channel", "Deferred", "channel_version", "1701", "kb", kb16),
      make_array("sp", 0, "version", "16.0.8201.2136", "channel", "First Release for Deferred", "kb", kb16),
      make_array("sp", 0, "version", "16.0.8229.2086", "channel", "Current", "kb", kb16)
    )
  );
  if (hotfix_check_office_product(product:"Excel", checks:excel_checks, bulletin:bulletin))
    vuln = TRUE;
}

######################################################################
# Compatibility Pack
######################################################################
function perform_comppack_checks()
{
  local_var excel_compat_checks;

  ####################################################################
  # Excel Compatibility Pack
  ####################################################################
  excel_compat_checks = make_array(
    "12.0", make_array("version", "12.0.6771.5000", "kb", "3191897")
  );
  if (hotfix_check_office_product(product:"ExcelCnv", display_name:"Office Compatibility Pack SP3", checks:excel_compat_checks, bulletin:bulletin))
    vuln = TRUE;
}

######################################################################
# Excel Viewer
######################################################################
function perform_viewer_checks()
{
  var excel_vwr_checks = make_array(
    "12.0", make_array("version", "12.0.6771.5000", "kb", "3191833")
  );
  if (hotfix_check_office_product(product:"ExcelViewer", display_name:"Excel Viewer", checks:excel_vwr_checks, bulletin:bulletin))
    vuln = TRUE;
}

######################################################################
# MAIN
######################################################################
perform_office_checks();
perform_proof_checks();
perform_excel_checks();
perform_comppack_checks();
perform_viewer_checks();

if (vuln)
{
  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');
}

References