Vulnerabilities > CVE-2017-11357 - Improper Input Validation vulnerability in Telerik UI FOR Asp.Net Ajax

#
# (C) Tenable Network Security, Inc.
#


include("compat.inc");

if (description)
{
  script_id(107096);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/22");

  script_cve_id("CVE-2017-11317", "CVE-2017-11357");
  script_bugtraq_id(103171, 103173);
  script_xref(name:"IAVA", value:"2018-A-0066-S");

  script_name(english:"Telerik UI for ASP.NET AJAX RadAsyncUpload Multiple Vulnerabilities");
  script_summary(english:"Checks the version of Telerik.Web.UI.dll.");

  script_set_attribute(attribute:"synopsis", value:
"A web application development suite installed on the remote Windows
host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Telerik UI for ASP.NET AJAX installed on the remote
Windows host is affected by multiple vulnerabilities in
Telerik.Web.UI.dll. An unauthenticated, remote attacker can exploit
this, via specially crafted data, to execute arbitrary code.");
  # https://www.telerik.com/support/kb/aspnet-ajax/upload-%28async%29/details/insecure-direct-object-reference
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?77b0e65f");
  # https://www.telerik.com/support/kb/aspnet-ajax/upload-(async)/details/unrestricted-file-upload
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?49cbdec3");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Telerik UI for ASP.NET AJAX version R2 2017 SP2
(2017.2.711) or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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-2017-11357");

  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:"2017/08/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:telerik:ui_for_asp.net_ajax");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("telerik_ui_for_aspnet_ajax_installed.nbin");
  script_require_keys("installed_sw/Telerik UI for ASP.NET AJAX");
  script_require_ports(139, 445);

  exit(0);
}

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

function display_dword (dword, nox)
{
  local_var tmp;
  if (isnull(nox) || (nox == FALSE))
    tmp = "0x";
  else
    tmp = "";
  return "" + tmp + toupper(hexstr(raw_string(
    (dword >>> 24) & 0xFF,
    (dword >>> 16) & 0xFF,
    (dword >>> 8) & 0xFF,
    dword & 0xFF
  )));
}

app_name = "Telerik UI for ASP.NET AJAX";
has_a_patch = FALSE;
install = get_single_install(app_name:app_name, exit_if_unknown_ver:TRUE);

version = install['version'];
path = install['path'];
web_ui_dll = install['web_ui_dll'];

# 2017.2.711 and later is patched
if (ver_compare(ver:version, fix:"2017.2.711.0", strict:FALSE) >= 0)
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, version, path);

# 2011.1.315 to 2017.2.621 have patches + mitigations available
if ((ver_compare(ver:version, fix:"2011.1.315.0", strict:FALSE) >= 0) &&
    (ver_compare(ver:version, fix:"2017.2.621.9999", strict:FALSE) <= 0))

{
  # check for "Telerik.Web.UI.Patch" in the File Description

  # 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");

  share = ereg_replace(pattern:"^([A-Za-z]):.*", replace:"\1$", string:web_ui_dll);
  dll = ereg_replace(pattern:"^[A-Za-z]:(.*)", replace:"\1", string:web_ui_dll);

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

  fh = CreateFile(
    file:dll,
    desired_access:GENERIC_READ,
    file_attributes:FILE_ATTRIBUTE_NORMAL,
    share_mode:FILE_SHARE_READ,
    create_disposition:OPEN_EXISTING
  );

  file_description = NULL;
  if (!isnull(fh))
  {
    ret = GetFileVersionEx(handle:fh);
    if (!isnull(ret)) children = ret['Children'];
    if (!isnull(children))
    {
      varfileinfo = children['VarFileInfo'];
      if (!isnull(varfileinfo))
      {
        translation =
          (get_word (blob:varfileinfo['Translation'], pos:0) << 16) +
          get_word (blob:varfileinfo['Translation'], pos:2);
        translation = tolower(display_dword(dword:translation, nox:TRUE));
      }
      stringfileinfo = children['StringFileInfo'];
      if (!isnull(stringfileinfo) && !isnull(translation))
      {
        data = stringfileinfo[translation];
        if (!isnull(data)) file_description = data['FileDescription'];
        else
        {
          data = stringfileinfo[toupper(translation)];
          if (!isnull(data)) file_description = data['FileDescription'];
        }
      }
    }
    CloseFile(handle:fh);
  }
  NetUseDel();

  if (empty_or_null(file_description))
    exit(1, "Failed to get the file description of " + web_ui_dll + ".");

  if (file_description == "Telerik.Web.UI.Patch")
    has_a_patch = TRUE;
}

if (has_a_patch)
{
  # if it has *a* patch, we can't be sure that it is the correct patch
  # and we also can't tell if they have applied the mitigations to go
  # with the patch, so if we're paranoid, we add a note to the report
  # (done below) and if we're not paranoid, we audit out
  if (report_paranoia < 2) audit(AUDIT_PARANOID);
}

port = get_kb_item("SMB/transport");
if (empty_or_null(port))
  port = 445;

report = report_items_str(
  report_items:make_array(
    "Path", path,
    "Installed version", version,
    "Fixed version", "2017.2.711.0 or vendor supplied patch"
  ),
  ordered_fields:make_list("Path", "Installed version", "Fixed version")
);

if (has_a_patch)
  report += '\n\n' + "Although a patch has been applied, we aren't able to determine if this is the" +
            '\n' + "correct patch for these vulnerabilities. As per the vendor advisory, you must" +
            '\n' + "ensure that the patch you applied was downloaded after August 15th, 2017. You" +
            '\n' + "must also ensure the appropriate mitigations (disable file uploads or disable" +
            '\n' + "POST requests) have been applied as per the vendor advisory";

security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);

#
# (C) Tenable Network Security, Inc.
#




include('compat.inc');

if (description)
{
  script_id(135970);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/22");

  script_cve_id("CVE-2019-18935");
  script_xref(name:"IAVA", value:"2020-A-0219");

  script_name(english:"Telerik UI for ASP.NET AJAX RadAsyncUpload .NET Deserialization Vulnerability");

  script_set_attribute(attribute:"synopsis", value:
"A web application development suite installed on the remote Windows
host is affected by a deserialization vulnerability.");
  script_set_attribute(attribute:"description", value:
"Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability 
in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to 
the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result 
in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. 
In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)");
  # https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?de2ce6ef");
  # https://docs.telerik.com/devtools/aspnet-ajax/controls/asyncupload/security?&_ga=2.224762457.29387225.1587722153-1707628900.1586272484#allowedcustommetadatatypes
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?be6fd178");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Telerik UI for ASP.NET AJAX version R3 2019 SP1
(2019.3.1023) or later, and enable the type whitelisting feature of RadAsyncUpload.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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-2019-18935");

  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:"vuln_publication_date", value:"2019/12/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:telerik:ui_for_asp.net_ajax");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

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

  script_dependencies("telerik_ui_for_aspnet_ajax_installed.nbin");
  script_require_keys("installed_sw/Telerik UI for ASP.NET AJAX");
  script_require_ports(139, 445);

  exit(0);
}

include('install_func.inc');
include('smb_func.inc');
include('smb_hotfixes.inc');

app_name = 'Telerik UI for ASP.NET AJAX';
opt_in = FALSE;
install = get_single_install(app_name:app_name, exit_if_unknown_ver:TRUE);

version = install['version'];
path = install['path'];

# 2020.1.114 and later have default settings available
if (ver_compare(ver:version, fix:'2020.1.114.0', strict:FALSE) >= 0)
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, version, path);

# 2019.3.1023 has opt-in settings available, but not by default
if ((ver_compare(ver:version, fix:'2019.3.1023', strict:FALSE) >= 0) &&
    (ver_compare(ver:version, fix:'2020.1.114.0', strict:FALSE) <= 0))
{
  opt_in = TRUE;
}

if (opt_in)
{
  # if version is 2019.3.1023 or higher, but lower than 2020.1.114.0, 
  # type whitelisting feature of RadAsyncUpload needs to be enabled manually.
  # so if we're paranoid, we add a note to the report
  # (done below) and if we're not paranoid, we audit out
  if (report_paranoia < 2) audit(AUDIT_PARANOID);
}

port = get_kb_item('SMB/transport');
if (empty_or_null(port))
  port = 445;

report = report_items_str(
  report_items:make_array(
    'Path', path,
    'Installed version', version,
    'Fixed version', '2019.3.1023'
  ),
  ordered_fields:make_list('Path', 'Installed version', 'Fixed version')
);

if (opt_in)
  report += '\n\n' + 'Although the type whitelisting feature of RadAsyncUpload is available for this version,' +
            '\n' + 'we are not able to determine if this is actually enabled. Following the advisory,' +
            '\n' + 'you should ensure that this is the case.';

security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);