Vulnerabilities > CVE-2017-8536 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft products

047910
CVSS 4.3 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
microsoft
CWE-119
nessus
exploit available

Summary

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to denial of service. aka "Microsoft Malware Protection Engine Denial of Service Vulnerability", a different vulnerability than CVE-2017-8535, CVE-2017-8537, CVE-2017-8539, and CVE-2017-8542.

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.

Exploit-Db

descriptionMicrosoft MsMpEng - Multiple Crashes While Scanning Malformed Files. CVE-2017-8535,CVE-2017-8536,CVE-2017-8537,CVE-2017-8538. Dos exploit for Windows platform
fileexploits/windows/dos/42081.txt
idEDB-ID:42081
last seen2017-05-29
modified2017-05-29
platformwindows
port
published2017-05-29
reporterExploit-DB
sourcehttps://www.exploit-db.com/download/42081/
titleMicrosoft MsMpEng - Multiple Crashes While Scanning Malformed Files
typedos

Nessus

NASL familyWindows
NASL idMICROSOFT_MPENG_1_1_13804.NASL
descriptionThe version of Microsoft Malware Protection Engine (MMPE) installed on the remote Windows host is prior to 1.1.13804.0. It is, therefore, affected by multiple vulnerabilities : - Multiple denial of service vulnerabilities exist due to improper scanning of specially crafted files. An unauthenticated, remote attacker can exploit these, by convincing a user to download or open a malicious file, to cause the monitoring service to stop. (CVE-2017-8535, CVE-2017-8536, CVE-2017-8537, CVE-2017-8539, CVE-2017-8542) - Multiple memory corruption issues exist due to improper validation of input when scanning specially crafted files. An unauthenticated, remote attacker can exploit these, by convincing a user to download or open a malicious file, to cause a denial of service condition or the possible execution of arbitrary code. (CVE-2017-8538, CVE-2017-8541) - A use-after-free error exists in the garbage collection system used for managing JavaScript objects when scanning specially crafted files. An unauthenticated, remote attacker can exploit this, by convincing a user to download or open a malicious file, to dereference already freed memory and potentially execute arbitrary code. (CVE-2017-8540) - A flaw exits in the x86 emulator implementation for the Win32 API due to improper restrictions on access to certain NTDLL routines. An unauthenticated, remote attacker can exploit this, by convincing a user to download or open a malicious file, to execute arbitrary code with SYSTEM privileges. Note that Nessus has checked if a vulnerable version of MMPE is being used by any of the following applications : - Microsoft Forefront Endpoint Protection 2010 - Microsoft Endpoint Protection - Microsoft Forefront Security for SharePoint - Microsoft System Center Endpoint Protection - Microsoft Security Essentials - Windows Defender for Windows 7, Windows 8.1, Windows RT 8.1, Windows 10, Windows 10 1511, Windows 10 1607, Windows 10 1703, and Windows Server 2016 - Windows Intune Endpoint Protection
last seen2020-06-01
modified2020-06-02
plugin id100551
published2017-05-31
reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/100551
titleMicrosoft Malware Protection Engine < 1.1.13804 Multiple Vulnerabilities
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100551);
  script_version("1.7");
  script_cvs_date("Date: 2019/11/13");

  script_cve_id(
    "CVE-2017-8535",
    "CVE-2017-8536",
    "CVE-2017-8537",
    "CVE-2017-8538",
    "CVE-2017-8539",
    "CVE-2017-8540",
    "CVE-2017-8541",
    "CVE-2017-8542"
  );
  script_bugtraq_id(
    98702,
    98703,
    98704,
    98705,
    98706,
    98707,
    98708,
    98710
  );

  script_name(english:"Microsoft Malware Protection Engine < 1.1.13804 Multiple Vulnerabilities");
  script_summary(english:"Checks the engine version.");

  script_set_attribute(attribute:"synopsis", value:
"An antimalware application installed on the remote host is affected by
multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Microsoft Malware Protection Engine (MMPE) installed on
the remote Windows host is prior to 1.1.13804.0. It is, therefore,
affected by multiple vulnerabilities :

  - Multiple denial of service vulnerabilities exist due to
    improper scanning of specially crafted files. An
    unauthenticated, remote attacker can exploit these, by
    convincing a user to download or open a malicious file,
    to cause the monitoring service to stop. (CVE-2017-8535,
    CVE-2017-8536, CVE-2017-8537, CVE-2017-8539,
    CVE-2017-8542)

  - Multiple memory corruption issues exist due to improper
    validation of input when scanning specially crafted
    files. An unauthenticated, remote attacker can exploit
    these, by convincing a user to download or open a
    malicious file, to cause a denial of service condition
    or the possible execution of arbitrary code.
    (CVE-2017-8538, CVE-2017-8541)

  - A use-after-free error exists in the garbage collection
    system used for managing JavaScript objects when
    scanning specially crafted files. An unauthenticated,
    remote attacker can exploit this, by convincing a user
    to download or open a malicious file, to dereference
    already freed memory and potentially execute arbitrary
    code. (CVE-2017-8540)

  - A flaw exits in the x86 emulator implementation for the
    Win32 API due to improper restrictions on access to
    certain NTDLL routines. An unauthenticated, remote
    attacker can exploit this, by convincing a user to
    download or open a malicious file, to execute arbitrary
    code with SYSTEM privileges.

Note that Nessus has checked if a vulnerable version of MMPE is being
used by any of the following applications :

  - Microsoft Forefront Endpoint Protection 2010

  - Microsoft Endpoint Protection

  - Microsoft Forefront Security for SharePoint

  - Microsoft System Center Endpoint Protection

  - Microsoft Security Essentials

  - Windows Defender for Windows 7, Windows 8.1, Windows RT
    8.1, Windows 10, Windows 10 1511, Windows 10 1607,
    Windows 10 1703, and Windows Server 2016

  - Windows Intune Endpoint Protection");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8535
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f8fbaf43");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8536
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?11f499cd");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8537
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e396b434");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8538
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?488a2d94");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8539
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8c519ccb");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8540
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e672c25a");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8541
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bffe5e2f");
  # https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8542
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b798c511");
  # https://support.microsoft.com/en-us/help/2510781/microsoft-malware-protection-engine-deployment-information
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?34db9ea8");
  script_set_attribute(attribute:"see_also", value:"https://bugs.chromium.org/p/project-zero/issues/detail?id=1260");
  script_set_attribute(attribute:"solution", value:
"Enable automatic updates to update the scan engine for the relevant
antimalware applications. Refer to Knowledge Base Article 2510781 for
information on how to verify that MMPE has been updated.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-8541");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/05/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/05/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/05/31");

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

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

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_hotfixes.nasl", "fcs_installed.nasl");
  script_require_keys("SMB/Registry/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("smb_func.inc");

get_kb_item_or_exit("SMB/Registry/Enumerated");

# indicates if any antimalware products were found. this is used
# to determine whether or not the plugin should check if defender is affected
antimalware_installed = FALSE;

# Connect to the appropriate share.
port    =  kb_smb_transport();
login   =  kb_smb_login();
pass    =  kb_smb_password();
domain  =  kb_smb_domain();

if(! smb_session_init()) audit(AUDIT_FN_FAIL, 'smb_session_init');

rc = NetUseAdd(login:login, password:pass, domain:domain, share:"IPC$");
if (rc != 1)
{
  NetUseDel();
  audit(AUDIT_SHARE_FAIL, "IPC$");
}

# Connect to remote registry.
hklm = RegConnectRegistry(hkey:HKEY_LOCAL_MACHINE);
if (isnull(hklm))
{
  NetUseDel();
  audit(AUDIT_REG_FAIL);
}

# Figure out where it is installed.
path = NULL;
info = '';
info2 = '';
engine_version = NULL;

fixed_engine_version = "1.1.13804.0";
last_vulnerable = "1.1.13704.0";

# Forefront Client Security (either both or neither of these will be in the KB)
engine_version = get_kb_item("Antivirus/Forefront_Client_Security/engine_version");
fcs_path = get_kb_item("Antivirus/Forefront_Client_Security/path");
if (!isnull(engine_version))
{
  antimalware_installed = TRUE;

  if (ver_compare(ver:engine_version, fix:last_vulnerable) <= 0)
  {
    info +=
      '\n  Product           : Microsoft Forefront Client Security'+
      '\n  Path              : ' + fcs_path +
      '\n  Installed version : ' + engine_version +
      '\n  Fixed version     : ' + fixed_engine_version + '\n';
  }
  else info2 += 'Microsoft Forefront Client Security with MMPE version '+ engine_version + ". ";
}

# Microsoft Security Essentials
# Forefront Endpoint Protection
# System Center Endpoint Protection
engine_version = NULL;

NetUseDel(close:FALSE);
rc = NetUseAdd(login:login, password:pass, domain:domain, share:"IPC$");
if (rc != 1)
{
  NetUseDel();
  audit(AUDIT_SHARE_FAIL, "IPC$");
}

# Connect to remote registry again.
hklm = RegConnectRegistry(hkey:HKEY_LOCAL_MACHINE);
if (isnull(hklm))
{
  NetUseDel();
  audit(AUDIT_REG_FAIL);
}

key = "SOFTWARE\Microsoft\Microsoft Antimalware\Signature Updates";
key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
if (!isnull(key_h))
{
  value = RegQueryValue(handle:key_h, item:"EngineVersion");
  if (!isnull(value)) engine_version = value[1];

  RegCloseKey(handle:key_h);
}

path = NULL;
key = "SOFTWARE\Microsoft\Microsoft Antimalware";
key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
if (!isnull(key_h))
{
  value = RegQueryValue(handle:key_h, item:"InstallLocation");
  if (!isnull(value)) path = value[1];

  RegCloseKey(handle:key_h);
}

if(!isnull(path))
{
  found = 0;
  # Check if the main exe exists.
  share = ereg_replace(pattern:"^([A-Za-z]):.*", replace:"\1$", string:path);
  exe =  ereg_replace(pattern:"^[A-Za-z]:(.*)", replace:"\1\MsMpEng.exe", string:path);
  NetUseDel(close:FALSE);
  rc = NetUseAdd(login:login, password:pass, domain:domain, share:share);
  if (rc != 1)
  {
    NetUseDel();
    audit(AUDIT_SHARE_FAIL, share);
  }
  fh = CreateFile(
    file:exe,
    desired_access:GENERIC_READ,
    file_attributes:FILE_ATTRIBUTE_NORMAL,
    share_mode:FILE_SHARE_READ,
    create_disposition:OPEN_EXISTING
  );
  if (!isnull(fh))
  {
    antimalware_installed = TRUE;
    found = 1;
    CloseFile(handle:fh);
  }

  if (found && !isnull(engine_version))
  {
    if (ver_compare(ver:engine_version, fix:last_vulnerable) <= 0)
    {
      info +=
       '\n  Product           : Microsoft Security Essentials / Forefront Endpoint Protection / System Center Endpoint Protection'+
       '\n  Path              : ' + share[0] + ':' + exe +
       '\n  Installed version : ' + engine_version +
       '\n  Fixed version     : ' + fixed_engine_version + '\n';
    }
    else info2 += 'Microsoft Security Essentials / Forefront Endpoint Protection / System Center Endpoint Protection with MMPE version ' + engine_version + ". ";
  }
}

# Microsoft Windows Defender
# defender is apparently disabled when other antimalware products are installed,
# so it will only be checked if the plugin hasn't detected other products are present
if (!antimalware_installed)
{
  defender_enabled = TRUE;
  engine_version = NULL;

  # Check if Windows Defender is disabled via group policy
  key = "SOFTWARE\Policies\Microsoft\Windows Defender";
  key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
  if (!isnull(key_h))
  {
    value = RegQueryValue(handle:key_h, item:"DisableAntiSpyware");
    if (!isnull(value))
    {
      if (value[1] > 0)
      {
        defender_enabled = FALSE;
      }
    }
    RegCloseKey(handle:key_h);
  }
  key = "SOFTWARE\Microsoft\Windows Defender";
  key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
  if (!isnull(key_h))
  {
    value = RegQueryValue(handle:key_h, item:"DisableAntiSpyware");
    if (!isnull(value))
    {
      if (value[1] > 0)
      {
        defender_enabled = FALSE;
      }
    }
    RegCloseKey(handle:key_h);
  }
  if (defender_enabled)
  {
    key = "SOFTWARE\Microsoft\Windows Defender\Signature Updates";
    key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
    if (!isnull(key_h))
    {
      value = RegQueryValue(handle:key_h, item:"EngineVersion");
      if (!isnull(value)) engine_version = value[1];

      RegCloseKey(handle:key_h);
    }

    path = NULL;
    key = "SOFTWARE\Microsoft\Windows Defender\Signature Updates";
    key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
    if (!isnull(key_h))
    {
      value = RegQueryValue(handle:key_h, item:"SignatureLocation");
      if (!isnull(value)) path = value[1];

      RegCloseKey(handle:key_h);
    }

    if(!isnull(path))
    {
      found = 0;
      defender_dll = NULL;
      # Check the version of the main exe.
      share = ereg_replace(pattern:"^([A-Za-z]):.*", replace:"\1$", string:path);
      # this is the path smb_kb4022344.nasl checks
      dll1 =  ereg_replace(pattern:"^[A-Za-z]:(.+Windows Defender\\Definition Updates).+", replace:"\1\Default\MpEngine.dll", string:path);
      # this path works for Windows Defender on Windows 8
      dll2 =  ereg_replace(pattern:"^[A-Za-z]:(.+)$", replace:"\1\MpEngine.dll", string:path);
      NetUseDel(close:FALSE);
      rc = NetUseAdd(login:login, password:pass, domain:domain, share:share);
      if (rc != 1)
      {
        NetUseDel();
        audit(AUDIT_SHARE_FAIL, share);
      }
      fh = CreateFile(
        file:dll1,
        desired_access:GENERIC_READ,
        file_attributes:FILE_ATTRIBUTE_NORMAL,
        share_mode:FILE_SHARE_READ,
        create_disposition:OPEN_EXISTING
      );
      if (!isnull(fh))
      {
        found =1 ;
        defender_dll = share[0] + ':' + dll1;
        CloseFile(handle:fh);
      }

      if (found == 0)
      {
        fh = CreateFile(
          file:dll2,
          desired_access:GENERIC_READ,
          file_attributes:FILE_ATTRIBUTE_NORMAL,
          share_mode:FILE_SHARE_READ,
          create_disposition:OPEN_EXISTING
        );
        if (!isnull(fh))
        {
          found =1 ;
          defender_dll = share[0] + ':' + dll2;
          CloseFile(handle:fh);
        }
      }

      if (found && !isnull(engine_version))
      {
        if (ver_compare(ver:engine_version, fix:last_vulnerable) <= 0)
        {
          info +=
           '\n  Product           : Microsoft Windows Defender'+
           '\n  Path              : ' + defender_dll +
           '\n  Installed version : ' + engine_version +
           '\n  Fixed version     : ' + fixed_engine_version + '\n';
        }
        else info2 += 'Microsoft Windows Defender with MMPE version ' + engine_version + ". ";
      }
    }
  }
}

RegCloseKey(handle:hklm);
NetUseDel();

if (info)
{
  report = '\n' +
    "Nessus found following vulnerable product(s) installed :" +'\n'+
    info;
  security_report_v4(severity:SECURITY_HOLE, port:port, extra:report);

  exit(0);
}
else if(info2) exit(0,"The following instance(s) of MMPE are installed and not vulnerable : "+ info2);
else exit(0, "Nessus could not find evidence of affected Microsoft antimalware products installed.");