Vulnerabilities > CVE-2015-2556 - Information Exposure vulnerability in Microsoft Sharepoint Server 2007/2010

047910
CVSS 4.3 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
NONE
Availability impact
NONE
network
microsoft
CWE-200
nessus
NVD
Published: 2015-10-14
Updated: 2018-10-12

Summary

The InfoPath Forms Services component in Microsoft SharePoint Server 2007 SP3 and 2010 SP2 misparses DTDs, which allows remote attackers to read arbitrary files via an XML document containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue, aka "Microsoft SharePoint Information Disclosure Vulnerability."

Vulnerable Configurations

Part Description Count
Application
Microsoft
2

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Subverting Environment Variable Values
    The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
  • Footprinting
    An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Browser Fingerprinting
    An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.

Nessus

NASL familyWindows : Microsoft Bulletins
NASL idSMB_NT_MS15-110.NASL
descriptionThe remote Windows host has a version of Microsoft Office, Excel, Excel Viewer, SharePoint Server, Microsoft Office Compatibility Pack, or Microsoft Office Web Apps installed that is affected by multiple vulnerabilities : - Multiple remote code execution vulnerabilities exist due to improper handling of objects in memory. A remote attacker can exploit these vulnerabilities by convincing a user to open a specially crafted file, resulting in execution of arbitrary code in the context of the current user. (CVE-2015-2555, CVE-2015-2557, CVE-2015-2558) - An information disclosure vulnerability exists in the SharePoint InfoPath Forms Services due to improper parsing of document type definitions (DTD) in XML files. A remote attacker can exploit this, via a crafted XML file, to browse the contents of arbitrary files on a SharePoint server. (CVE-2015-2556) - A cross-site scripting vulnerability exists in Office Web Apps Server due to improper sanitization of crafted requests before returning it to the user. A remote attacker can exploit this to run arbitrary script code in the user
last seen2020-06-01
modified2020-06-02
plugin id86374
published2015-10-13
reporterThis script is Copyright (C) 2015-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/86374
titleMS15-110: Security Updates for Microsoft Office to Address Remote Code Execution (3089440)
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(86374);
  script_version("1.10");
  script_cvs_date("Date: 2018/07/30 15:31:33");

  script_cve_id(
    "CVE-2015-2555",
    "CVE-2015-2556",
    "CVE-2015-2557",
    "CVE-2015-2558",
    "CVE-2015-6037",
    "CVE-2015-6039"
  );
  script_bugtraq_id(
    76988,
    76996,
    76997,
    77003,
    77009,
    77011
  );
  script_xref(name:"MSFT", value:"MS15-110");
  script_xref(name:"MSKB", value:"2553405");
  script_xref(name:"MSKB", value:"2596670");
  script_xref(name:"MSKB", value:"2920693");
  script_xref(name:"MSKB", value:"3054994");
  script_xref(name:"MSKB", value:"3085514");
  script_xref(name:"MSKB", value:"3085520");
  script_xref(name:"MSKB", value:"3085542");
  script_xref(name:"MSKB", value:"3085567");
  script_xref(name:"MSKB", value:"3085568");
  script_xref(name:"MSKB", value:"3085571");
  script_xref(name:"MSKB", value:"3085582");
  script_xref(name:"MSKB", value:"3085583");
  script_xref(name:"MSKB", value:"3085595");
  script_xref(name:"MSKB", value:"3085596");
  script_xref(name:"MSKB", value:"3085609");
  script_xref(name:"MSKB", value:"3085615");
  script_xref(name:"MSKB", value:"3085618");
  script_xref(name:"MSKB", value:"3085619");

  script_name(english:"MS15-110: Security Updates for Microsoft Office to Address Remote Code Execution (3089440)");
  script_summary(english:"Checks the Office and SharePoint versions.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host has a version of Microsoft Office, Excel,
Excel Viewer, SharePoint Server, Microsoft Office Compatibility Pack,
or Microsoft Office Web Apps installed that is affected by multiple
vulnerabilities :

  - Multiple remote code execution vulnerabilities exist due
    to improper handling of objects in memory. A remote
    attacker can exploit these vulnerabilities by convincing
    a user to open a specially crafted file, resulting in
    execution of arbitrary code in the context of the current
    user. (CVE-2015-2555, CVE-2015-2557, CVE-2015-2558)

  - An information disclosure vulnerability exists in the
    SharePoint InfoPath Forms Services due to improper
    parsing of document type definitions (DTD) in XML files.
    A remote attacker can exploit this, via a crafted XML
    file, to browse the contents of arbitrary files on a
    SharePoint server. (CVE-2015-2556)

  - A cross-site scripting vulnerability exists in Office
    Web Apps Server due to improper sanitization of crafted
    requests before returning it to the user. A remote
    attacker can exploit this to run arbitrary script code
    in the user's browser session. (CVE-2015-6037)

  - A security feature bypass vulnerability exists in
    SharePoint due to improper enforcement of permission
    levels for applications or users. This allows Office
    Marketplace to inject JavaScript code that will persist
    in a SharePoint page. A remote attacker can exploit this
    to conduct a cross-site scripting attack, resulting in
    execution of arbitrary code in the user's browser
    session. (CVE-2015-6039)");
  script_set_attribute(attribute:"see_also", value:"https://technet.microsoft.com/library/security/ms15-110");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Office 2007, 2010, 2013,
2013 RT, 2016; SharePoint Server 2007, 2010, 2013; Microsoft Office
Compatibility Pack SP3; Microsoft Excel Viewer; and Microsoft Office
Web Apps 2010, 2013.");
  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_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/10/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/10/13");

  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_viewer");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:visio");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:sharepoint_server");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office_web_apps");
  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) 2015-2018 Tenable Network Security, Inc.");

  script_dependencies("office_installed.nasl", "microsoft_owa_installed.nbin", "microsoft_sharepoint_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 bulletin, vuln;

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS15-110';
kbs = make_list(
  2553405, # SharePoint Server 2010
  2596670, # SharePoint Server 2007
  2920693, # Excel 2016
  3054994, # Excel Services for SharePoint Server 2007
  3085514, # Visio 2010 SP2
  3085520, # Office Web Apps 2010
  3085542, # Visio 2007 SP3
  3085567, # SharePoint Server 2013
  3085568, # Excel Services for SharePoint Server 2013
  3085571, # Office Web Apps 2013
  3085582, # SharePoint Foundation 2013
  3085583, # Excel 2013 SP1
  3085595, # Excel Web App 2010
  3085596, # Excel Services for SharePoint Server 2010
  3085609, # Excel 2010 SP2
  3085615, # Excel 2007 SP3
  3085618, # Compatibility Pack
  3085619  # Excel Viewer
);

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);

# Get path information for Windows.
windir = hotfix_get_systemroot();
if (isnull(windir)) exit(1, "Failed to determine the location of %windir%.");
registry_init();

######################################################################
# SharePoint
######################################################################
function perform_sharepoint_checks()
{
  local_var sps_2007_path, sps_2007_sp, sps_2007_edition;
  local_var sps_2010_path, sps_2010_sp, sps_2010_edition;
  local_var sps_2013_path, sps_2013_sp, sps_2013_edition;
  local_var installs, install, path, prod;

  sps_2013_path = NULL;

  installs = get_installs(app_name:"Microsoft SharePoint Server");
  foreach install (installs[1])
  {
    if (install['Product'] == "2007")
    {
      sps_2007_path = install['path'];
      sps_2007_sp = install['SP'];
      sps_2007_edition = install['Edition'];
    }
    else if (install["Product"] == "2010")
    {
      sps_2010_path = install['path'];
      sps_2010_sp = install['SP'];
      sps_2010_edition = install['Edition'];
    }
    else if (install['Product'] == "2013")
    {
      sps_2013_path = install['path'];
      sps_2013_sp = install['SP'];
      sps_2013_edition = install['Edition'];
      break;
    }
  }

  ######################################################################
  # SharePoint Server 2007 SP3
  ######################################################################
  if (sps_2007_path && sps_2007_sp == "3" && sps_2007_edition == "Server")
  {
    path = hotfix_append_path(path:sps_2007_path, value:"Bin");
    if (hotfix_check_fversion(file:"Microsoft.Office.InfoPath.Server.dll", version:"12.0.6732.5000", path:path, bulletin:bulletin, kb:"2596670", product:"Microsoft SharePoint Server 2007 SP3") == HCF_OLDER)
      vuln = TRUE;
  }

  ######################################################################
  # SharePoint Server 2010 SP2
  ######################################################################
  if (sps_2010_path && sps_2010_sp == "2" && sps_2010_edition == "Server")
  {
    path = hotfix_append_path(path:sps_2010_path, value:"Bin");
    if (hotfix_check_fversion(file:"Microsoft.Office.InfoPath.Server.dll", version:"14.0.7159.5000", path:path, bulletin:bulletin, kb:"2553405", product:"Microsoft SharePoint Server 2010 SP2") == HCF_OLDER)
      vuln = TRUE;
  }

  ######################################################################
  # SharePoint Server 2013
  ######################################################################
  if (sps_2013_path)
  {
    if ("Server" >< sps_2013_edition && sps_2013_sp == "1")
    {
      prod = "SharePoint Server 2013 SP1";
      path = hotfix_append_path(path:windir, value:"Microsoft.NET\assembly\GAC_MSIL\Microsoft.SharePoint.Publishing\v4.0_15.0.0.0__71e9bce111e9429c");
      if (hotfix_check_fversion(file:"Microsoft.SharePoint.Publishing.dll", version:"15.0.4763.1000", path:path, bulletin:bulletin, kb:"3085567", product:prod) == HCF_OLDER)
        vuln = TRUE;
    }
    else if ("Foundation" >< sps_2013_edition && sps_2013_sp == "1")
    {
      prod = "SharePoint Foundation 2013 SP1";
      prod = "SharePoint Foundation 2013";
      path = hotfix_append_path(path:hotfix_get_commonfilesdir(), value:"Microsoft Shared\Web Server Extensions\15\BIN\");
      if (hotfix_check_fversion(file:"CsiSrv.dll", version:"15.0.4763.1000", path:path, bulletin:bulletin, kb:"3085582", product:prod) == HCF_OLDER)
        vuln = TRUE;
    }
  }

  # Office Services and Web Apps
  ######################################################################
  # SharePoint Server 2007 SP3 - Excel Services
  ######################################################################
  if (sps_2007_path && sps_2007_sp == "3" && sps_2007_edition == "Server")
  {
    path = hotfix_append_path(path:sps_2007_path, value:"Bin");
    if (hotfix_check_fversion(file:"xlsrv.dll", version:"12.0.6732.5000", path:path, bulletin:bulletin, kb:"3054994", product:"Office SharePoint Server 2007 Excel Services") == HCF_OLDER)
      vuln = TRUE;
  }

  ######################################################################
  # SharePoint Server 2010 SP2 - Excel Services
  ######################################################################
  if (sps_2010_path && sps_2010_sp == "2" && sps_2010_edition == "Server")
  {
    path = hotfix_append_path(path:sps_2010_path, value:"Bin");
    if (hotfix_check_fversion(file:"xlsrv.dll", version:"14.0.7159.5000", path:path, bulletin:bulletin, kb:"3085596", product:"Office SharePoint Server 2010 Excel Services") == HCF_OLDER)
      vuln = TRUE;
  }

  ######################################################################
  # SharePoint Server 2013 SP1 - Excel Services
  ######################################################################
  if (sps_2013_path && sps_2013_sp == "1" && sps_2013_edition == "Server")
  {
    path = hotfix_append_path(path:sps_2013_path, value:"Bin");
    if (hotfix_check_fversion(file:"xlsrv.dll", version:"15.0.4763.1000", path:path, bulletin:bulletin, kb:"3085568", product:"Office SharePoint Server 2013 Excel Services") == HCF_OLDER)
      vuln = TRUE;
  }
}

######################################################################
# Office Web Apps
######################################################################
function perform_owa_checks()
{
  local_var owa_installs, owa_install;
  local_var owa_2010_path, owa_2010_sp;
  local_var owa_2013_path, owa_2013_sp;
  local_var path;

  # Get installs of Office Web Apps
  owa_installs = get_installs(app_name:"Microsoft Office Web Apps");
  if (!empty_or_null(owa_installs))
  {
    foreach owa_install (owa_installs[1])
    {
      if (owa_install["Product"] == "2010")
      {
        owa_2010_path = owa_install["path"];
        owa_2010_sp = owa_install["SP"];
      }
      if (owa_install['Product'] == "2013")
      {
        owa_2013_path = owa_install['path'];
        owa_2013_sp = owa_install['SP'];
      }
    }
  }


  ######################################################################
  # Office Web Apps 2010 SP2
  ######################################################################
  if (owa_2010_path && (!isnull(owa_2010_sp) && owa_2010_sp == "2"))
  {
    path = hotfix_append_path(path:owa_2010_path, value:"14.0\WebServices\ConversionService\Bin\Converter");
    if (hotfix_check_fversion(file:"sword.dll", version:"14.0.7160.5000", min_version:"14.0.7015.1000", path:path, bulletin:bulletin, kb:"3085520", product:"Office Web Apps 2010") == HCF_OLDER)
      vuln = TRUE;
    path = hotfix_append_path(path:owa_2010_path, value:"14.0\Bin");
    if (hotfix_check_fversion(file:"xlsrv.dll", version:"14.0.7159.5000", min_version:"14.0.7015.1000", path:path, bulletin:bulletin, kb:"3085595", product:"Excel Web App 2010") == HCF_OLDER)
      vuln = TRUE;
  }

  ######################################################################
  # Office Web Apps 2013 SP1
  ######################################################################
  if (owa_2013_path && (!isnull(owa_2013_sp) && owa_2013_sp == "1"))
  {
    path = hotfix_append_path(path:owa_2013_path, value:"ExcelServicesEcs\bin");
    if (hotfix_check_fversion(file:"xlsrv.dll", version:"15.0.4763.1000", min_version:"15.0.4571.1500", path:path, bulletin:bulletin, kb:"3085571", product:"Office Web Apps 2013") == HCF_OLDER)
      vuln = TRUE;
  }
}

# Individual and odd ball office products
function perform_office_product_checks()
{
  local_var excel_checks, vwr_checks, compat_checks, kb;

  local_var installs, install, path; # For DLL checks

  ######################################################################
  # Excel Checks
  ######################################################################
  excel_checks = make_array(
    "12.0", make_array("sp", 3, "version", "12.0.6732.5000", "kb", "3085615"),
    "14.0", make_array("sp", 2, "version", "14.0.7160.5000", "kb", "3085609"),
    "15.0", make_array("sp", 1, "version", "15.0.4763.1000", "kb", "3085583"),
    "16.0", make_array("sp", 0, "version", "16.0.4288.1000", "channel", "MSI", "kb", "2920693")
  );
  if (hotfix_check_office_product(product:"Excel", checks:excel_checks, bulletin:bulletin))
    vuln = TRUE;

  ######################################################################
  # Excel Viewer
  ######################################################################
  vwr_checks = make_array(
    "12.0", make_array("version", "12.0.6732.5000", "kb", "3085619")
  );
  if (hotfix_check_office_product(product:"ExcelViewer", display_name:"Excel Viewer", checks:vwr_checks, bulletin:bulletin))
    vuln = TRUE;

  ######################################################################
  # Excel Compatibility pack
  ######################################################################
  compat_checks = make_array(
    "12.0", make_array("sp", 3, "version", "12.0.6723.5000", "kb", "3085618")
  );
  if (hotfix_check_office_product(product:"ExcelCnv", display_name:"Office Compatibility Pack SP3", checks:compat_checks, bulletin:bulletin))
    vuln = TRUE;
}

function perform_visio_checks()
{
  local_var installs,install,share,path,version;

  # Preconditions
  installs = get_kb_list("SMB/Office/Visio/*/VisioPath");
  if(isnull(installs))
    return;

  share = hotfix_path2share(path:path);
  if(!is_accessible_share(share:share))
    return;

  # Visio checks
  foreach install (keys(installs))
  {
    version = install - 'SMB/Office/Visio/' - '/VisioPath';
    if ("14.0" >!< version && "12.0" >!< version)
      continue;
    path = installs[install];
    if ("14.0" >< version && hotfix_is_vulnerable(path:path, file:"Visio.exe", version:"14.0.7160.5000", min_version:"14.0.6500.0", bulletin:bulletin, kb:"3085514"))
      vuln = TRUE;
    if ("12.0" >< version && hotfix_is_vulnerable(path:path, file:"Visio.exe", version:"12.0.6727.5000", min_version:"12.0.6000.0", bulletin:bulletin, kb:"3085542"))
      vuln = TRUE;
  }
}

perform_sharepoint_checks();
perform_owa_checks();
perform_office_product_checks();
perform_visio_checks();

if (vuln)
{
  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');
}

References