Vulnerabilities > CVE-2016-0132 - Improper Input Validation vulnerability in Microsoft .Net Framework

047910
CVSS 9.8 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
microsoft
CWE-20
critical
nessus
NVD
Published: 2016-03-09
Updated: 2018-10-12

Summary

Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, and 4.6.1 mishandles signature validation for unspecified elements of XML documents, which allows remote attackers to spoof signatures via a modified document, aka ".NET XML Validation Security Feature Bypass."

Vulnerable Configurations

Part Description Count
Application
Microsoft
7

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.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Msbulletin

bulletin_idMS16-035
bulletin_url
date2016-03-08T00:00:00
impactSecurity Feature Bypass
knowledgebase_id3141780
knowledgebase_url
severityImportant
titleSecurity Update for .NET Framework to Address Security Feature Bypass

Nessus

NASL familyWindows : Microsoft Bulletins
NASL idSMB_NT_MS16-035.NASL
descriptionThe remote Windows host is missing a security update. It is, therefore, affected by a security feature bypass vulnerability in the .NET Framework due to improper validation of certain elements in a signed XML document. An attacker can exploit this vulnerability to modify the contents of an XML file without invalidating the signature associated with the file.
last seen2020-05-16
modified2016-03-08
plugin id89757
published2016-03-08
reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/89757
titleMS16-035: Security Update for .NET Framework to Address Security Feature Bypass (3141780)
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(89757);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/15");

  script_cve_id("CVE-2016-0132");
  script_bugtraq_id(84075);
  script_xref(name:"MSFT", value:"MS16-035");
  script_xref(name:"MSKB", value:"3135998");
  script_xref(name:"MSKB", value:"3135997");
  script_xref(name:"MSKB", value:"3136000");
  script_xref(name:"MSKB", value:"3135994");
  script_xref(name:"MSKB", value:"3135995");
  script_xref(name:"MSKB", value:"3135996");
  script_xref(name:"MSKB", value:"3135983");
  script_xref(name:"MSKB", value:"3135985");
  script_xref(name:"MSKB", value:"3135991");
  script_xref(name:"MSKB", value:"3135989");
  script_xref(name:"MSKB", value:"3135984");
  script_xref(name:"MSKB", value:"3135988");
  script_xref(name:"MSKB", value:"3135987");
  script_xref(name:"MSKB", value:"3135982");
  script_xref(name:"IAVA", value:"2016-A-0068-S");

  script_name(english:"MS16-035: Security Update for .NET Framework to Address Security Feature Bypass (3141780)");
  script_summary(english:"Checks the file versions.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by a security feature bypass
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host is missing a security update. It is,
therefore, affected by a security feature bypass vulnerability in the
.NET Framework due to improper validation of certain elements in a
signed XML document. An attacker can exploit this vulnerability to
modify the contents of an XML file without invalidating the signature
associated with the file.");
  # https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2016/ms16-035
  script_set_attribute(attribute:"see_also", value:"https://www.nessus.org/u?69dfeed4");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for .NET Framework 2.0 SP2,
3.0 SP2, 3.5, 3.5.1, 4, 4.5.1, 4.5.2, 4.6, and 4.6.1.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-0132");

  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:"2016/03/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/03/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/03/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:.net_framework");
  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) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl", "microsoft_net_framework_installed.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");

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

global_var bulletin, vuln, arch;

arch = get_kb_item_or_exit('SMB/ARCH');
vuln = 0;
bulletin = 'MS16-035';

kbs = make_list(
  "3135998",
  "3135997",
  "3136000",
  "3135994",
  "3135995",
  "3135996",
  "3135983",
  "3135985",
  "3135991",
  "3135989",
  "3135984",
  "3135988",
  "3135987",
  "3135982"
);

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");
winver = get_kb_item_or_exit('SMB/WindowsVersion', exit_code:1);
if (hotfix_check_sp_range(vista:'2', win7:'1', win8:'0', win81:'0', win10:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

productname = get_kb_item_or_exit("SMB/ProductName", exit_code:1);
if ("Windows 8" >< productname && "Windows 8.1" >!< productname) audit(AUDIT_OS_SP_NOT_VULN);

share = hotfix_get_systemdrive(exit_on_fail:TRUE, as_share:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

# dotnet checks
function perform_dotnet_checks()
{
  local_var dotnet_452_installed, dotnet_46_installed, dotnet_461_installed, dotnet_35_installed;
  local_var ver, missing, count, installs, install;

  # Determine if .NET 4.5.2 or 4.6 is installed
  dotnet_452_installed = FALSE;
  dotnet_46_installed  = FALSE;
  dotnet_461_installed = FALSE;
  dotnet_35_installed  = FALSE;

  # Make sure to add dependency for microsoft_net_framework_installed.nasl
  count = get_install_count(app_name:'Microsoft .NET Framework');
  if (count > 0)
  {
    installs = get_installs(app_name:'Microsoft .NET Framework');
    foreach install(installs[1])
    {
      ver = install["version"];
      if (ver == "4.6.1") dotnet_461_installed = TRUE;
      if (ver == "4.6") dotnet_46_installed = TRUE;
      if (ver == "4.5.2") dotnet_452_installed = TRUE;
      if (ver == "3.5") dotnet_35_installed = TRUE;
    }
  }

  ########## KB3135982 #############
  # .NET Framework 2.0 SP2         #
  # Windows Vista SP2              #
  # Windows Server 2008 SP2        #
  ##################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"system.security.dll", version:"2.0.50727.4262", min_version:"2.0.50727.0",    dir:"\Microsoft.NET\Framework\v2.0.50727");
  missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"system.security.dll", version:"2.0.50727.8683", min_version:"2.0.50727.6500", dir:"\Microsoft.NET\Framework\v2.0.50727");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135982");
  vuln += missing;

  ########### KB3135983 #############
  # .NET Framework 3.5.1            #
  # Windows 7 SP1                   #
  # Windows Server 2008 R2 SP1      #
  ###################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.1", sp:1, file:"system.security.dll", version:"2.0.50727.5496", min_version:"2.0.50727.0",    dir:"\Microsoft.NET\Framework\v2.0.50727");
  missing += hotfix_is_vulnerable(os:"6.1", sp:1, file:"system.security.dll", version:"2.0.50727.8683", min_version:"2.0.50727.6500", dir:"\Microsoft.NET\Framework\v2.0.50727");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135983");
  vuln += missing;

  ########### KB3135991 ###########
  # .NET Framework 3.5            #
  # Windows 8.1                   #
  # Windows Server 2012 R2        #
  #################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.printing.dll", version:"3.0.6920.8010", min_version:"3.0.6920.0",    dir:"\Microsoft.NET\Framework\v2.0.50727");
  missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.printing.dll", version:"3.0.6920.8702", min_version:"3.0.6920.8500", dir:"\Microsoft.NET\Framework\v2.0.50727");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135991");
  vuln += missing;

  ########### KB3135989 ###########
  # .NET Framework 3.5            #
  # Windows Server 2012           #
  #################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.printing.dll", version:"3.0.6920.6423", min_version:"3.0.6920.0",    dir:"\Microsoft.NET\Framework\v2.0.50727");
  missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.printing.dll", version:"3.0.6920.8699", min_version:"3.0.6920.8500", dir:"\Microsoft.NET\Framework\v2.0.50727");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135989");
  vuln += missing;

  ############ KB3135984 ############
  # .NET Framework 3.5              #
  # Windows Server 2012             #
  ###################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.security.dll", version:"2.0.50727.6432", min_version:"2.0.50727.0",    dir:"\Microsoft.NET\Framework\v2.0.50727");
  missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.security.dll", version:"2.0.50727.8685", min_version:"2.0.50727.8300", dir:"\Microsoft.NET\Framework\v2.0.50727");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135984");
  vuln += missing;

  ############ KB3135985 ############
  # .NET Framework 3.5              #
  # Windows 8.1                     #
  # Windows Server 2012 R2          #
  ###################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.security.dll", version:"2.0.50727.8020", min_version:"2.0.50727.0",    dir:"\Microsoft.NET\Framework\v2.0.50727");
  missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.security.dll", version:"2.0.50727.8685", min_version:"2.0.50727.8300", dir:"\Microsoft.NET\Framework\v2.0.50727");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135985");
  vuln += missing;

  ############ KB3135987 ############
  # .NET Framework 3.0              #
  # Windows Vista                   #
  # Windows 7                       #
  # Windows 2008                    #
  # Windows 2008 R2                 #
  ###################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"wpfgfx_v0300.dll", version:"3.0.6920.4231", min_version:"3.0.6920.0", dir:"\Microsoft.NET\Framework\v3.0\WPF");
  missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"wpfgfx_v0300.dll", version:"3.0.6920.8702", min_version:"3.0.6920.7000", dir:"\Microsoft.NET\Framework\v3.0\WPF");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135987");
  vuln += missing;

  missing = 0;
  missing += hotfix_is_vulnerable(os:"6.1", sp:2, file:"wpfgfx_v0300.dll", version:"3.0.6920.5471", min_version:"3.0.6920.0", dir:"\Microsoft.NET\Framework\v3.0\WPF");
  missing += hotfix_is_vulnerable(os:"6.1", sp:2, file:"wpfgfx_v0300.dll", version:"3.0.6920.8699", min_version:"3.0.6920.7000", dir:"\Microsoft.NET\Framework\v3.0\WPF");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135988");
  vuln += missing;

  ############ KB3135994 ############
  # .NET Framework 4.5.2            #
  # Windows 8.1                     #
  # Windows Server 2012 R2          #
  ###################################
  if (dotnet_452_installed)
  {
    missing = 0;
    missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.security.dll", version:"4.0.30319.34292", min_version:"4.0.30319.0",     dir:"\Microsoft.NET\Framework\v4.0.30319");
    missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.security.dll", version:"4.0.30319.36346", min_version:"4.0.30319.35000", dir:"\Microsoft.NET\Framework\v4.0.30319");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135994");
    vuln += missing;
  }

  ########### KB3135995 ###########
  # .NET Framework 4.5.2          #
  # Windows Server 2012           #
  #################################
  if (dotnet_452_installed)
  {
    missing = 0;
    missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.security.dll", version:"4.0.30319.34292", min_version:"4.0.30319.0",     dir:"\Microsoft.NET\Framework\v4.0.30319");
    missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.security.dll", version:"4.0.30319.36346", min_version:"4.0.30319.35000", dir:"\Microsoft.NET\Framework\v4.0.30319");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135995");
    vuln += missing;
  }


  ########## KB3135996 #############
  # .NET Framework 4.5.2           #
  # Windows Vista SP2              #
  # Windows Server 2008 SP2        #
  # Windows 7 SP1                  #
  # Windows Server 2008 R2 SP1     #
  ##################################
  if (dotnet_452_installed)
  {
    missing = 0;
    missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"system.security.dll", version:"4.0.30319.34291", min_version:"4.0.30319.0",     dir:"\Microsoft.NET\Framework\v4.0.30319");
    missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"system.security.dll", version:"4.0.30319.36346", min_version:"4.0.30319.35000", dir:"\Microsoft.NET\Framework\v4.0.30319");
    missing += hotfix_is_vulnerable(os:"6.1", sp:1, file:"system.security.dll", version:"4.0.30319.34291", min_version:"4.0.30319.0",     dir:"\Microsoft.NET\Framework\v4.0.30319");
    missing += hotfix_is_vulnerable(os:"6.1", sp:1, file:"system.security.dll", version:"4.0.30319.36346", min_version:"4.0.30319.35000", dir:"\Microsoft.NET\Framework\v4.0.30319");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135996");
    vuln += missing;
  }

  ########### KB3135997 ###########
  # .NET Framework 4.6 / 4.6.1    #
  # Windows Server 2012           #
  #################################
  if (dotnet_46_installed || dotnet_461_installed)
  {
    missing = 0;
    missing += hotfix_is_vulnerable(os:"6.2", sp:0, file:"system.security.dll", version:"4.6.1073.0", min_version:"4.6.0.0", dir:"\Microsoft.NET\Framework\v4.0.30319");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135997");
    vuln += missing;
  }

  ############ KB3135998 ############
  # .NET Framework 4.6 / 4.6.1      #
  # Windows 8.1                     #
  # Windows Server 2012 R2          #
  ###################################
  if (dotnet_46_installed || dotnet_461_installed)
  {
    missing = 0;
    missing += hotfix_is_vulnerable(os:"6.3", sp:0, file:"system.security.dll", version:"4.6.1073.0", min_version:"4.6.0.0", dir:"\Microsoft.NET\Framework\v4.0.30319");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3135998");
    vuln += missing;
  }

  ########## KB3136000 #############
  # .NET Framework 4.6             #
  # Windows Vista SP2              #
  # Windows Server 2008 SP2        #
  # Windows 7 SP1                  #
  #  Windows Server 2008 R2 SP1    #
  ##################################
  if (dotnet_46_installed || dotnet_461_installed)
  {
    missing = 0;
    missing += hotfix_is_vulnerable(os:"6.0", sp:2, file:"system.security.dll", version:"4.6.1071.0", min_version:"4.6.0.0", dir:"\Microsoft.NET\Framework\v4.0.30319");
    missing += hotfix_is_vulnerable(os:"6.1", sp:1, file:"system.security.dll", version:"4.6.1071.0", min_version:"4.6.0.0", dir:"\Microsoft.NET\Framework\v4.0.30319");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3136000");
    vuln += missing;
  }

  ############# KB3140745 #############
  #  .NET Framework 3.5               #
  #  Windows 10                       #
  #####################################
  if (dotnet_35_installed)
  {
    #  3.5 is optional addon in 10
    missing = 0;
    missing += hotfix_is_vulnerable(os:"10", sp:0, file:"system.security.dll", version:"2.0.50727.8685", min_version:"2.0.50727.6500", dir:"\Microsoft.NET\Framework\v2.0.50727");

    if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3140745");
    vuln += missing;
  }

  ############# KB3140745 #############
  #  .NET Framework                   #
  #  Windows 10                       #
  #####################################
  missing = 0;
  missing += hotfix_is_vulnerable(os:"10", sp:0, file:"system.security.dll", version:"4.6.1073.0", min_version:"4.6.0.0", dir:"\Microsoft.NET\Framework\v4.0.30319");

  if (missing > 0) hotfix_add_report(bulletin:bulletin, kb:"3140745");
  vuln += missing;
}

perform_dotnet_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