Vulnerabilities > CVE-2016-7247 - Improper Access Control vulnerability in Microsoft products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
HIGH
Availability impact
NONE
network
low complexity
microsoft
CWE-284
nessus
NVD
Published: 2016-11-10
Updated: 2024-11-21

Summary

Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, and 1607, and Windows Server 2016 allow physically proximate attackers to bypass the Secure Boot protection mechanism via a crafted boot policy, aka "Secure Boot Component Vulnerability."

Vulnerable Configurations

Part Description Count
OS
Microsoft
8

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Embedding Scripts within Scripts
    An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
  • Signature Spoofing by Key Theft
    An attacker obtains an authoritative or reputable signer's private signature key by theft and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.

Msbulletin

bulletin_idMS16-140
bulletin_url
date2016-11-08T00:00:00
impactSecurity Feature Bypass
knowledgebase_id3193479
knowledgebase_url
severityImportant
titleSecurity Update for Boot Manager

Nessus

NASL familyWindows : Microsoft Bulletins
NASL idSMB_NT_MS16-140.NASL
descriptionThe remote Windows host is missing a security update. It is, therefore, affected a security bypass vulnerability in Windows Secure Boot due to the use of an insecure boot policy in firmware. A local attacker can exploit this issue to disable code integrity checks, allowing test-signed executables and drivers to be loaded onto a target device.
last seen2020-06-01
modified2020-06-02
plugin id94641
published2016-11-08
reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/94641
titleMS16-140: Security Update for Boot Manager (3193479)
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(94641);
  script_version("1.10");
  script_cvs_date("Date: 2019/11/14");

  script_cve_id("CVE-2016-7247");
  script_bugtraq_id(94058);
  script_xref(name:"MSFT", value:"MS16-140");
  script_xref(name:"MSKB", value:"3197873");
  script_xref(name:"MSKB", value:"3197874");
  script_xref(name:"MSKB", value:"3197876");
  script_xref(name:"MSKB", value:"3197877");
  script_xref(name:"MSKB", value:"3198585");
  script_xref(name:"MSKB", value:"3198586");
  script_xref(name:"MSKB", value:"3200970");
  script_xref(name:"IAVB", value:"2016-B-0162");

  script_name(english:"MS16-140: Security Update for Boot Manager (3193479)");
  script_summary(english:"Checks for the November 2016 Rollup.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a security bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host is missing a security update. It is,
therefore, affected a security bypass vulnerability in Windows Secure
Boot due to the use of an insecure boot policy in firmware. A local
attacker can exploit this issue to disable code integrity checks,
allowing test-signed executables and drivers to be loaded onto a
target device.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2016/ms16-140");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Windows 2012, 8.1, RT 8.1,
2012 R2, 10, and 2016.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-7247");

  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:"2016/11/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/11/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  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) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_check_rollup.nasl", "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_hotfixes_fcheck.inc");
include("smb_hotfixes.inc");
include("smb_func.inc");
include("smb_reg_query.inc");
include("misc_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS16-140';
kbs = make_list(
  '3197873', # 8.1 / 2012 R2
  '3197874', # 8.1 / 2012 R2
  '3197876', # 2012
  '3197877', # 2012
  '3198585', # 10
  '3198586', # 10 Version 1511
  '3200970'  # 10 Version 1607
);

if (get_kb_item("Host/patch_management_checks"))
  hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_WARNING);

get_kb_item_or_exit("SMB/Registry/Enumerated");
get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1);

if (hotfix_check_sp_range(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 && "8.1" >!< productname)
 audit(AUDIT_OS_SP_NOT_VULN);

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

if (
  # Windows Server 2012
  smb_check_rollup(os:"6.2", sp:0, rollup_date:"11_2016", bulletin:bulletin, rollup_kb_list:make_list(3197876, 3197877)) ||
  # Windows 8.1 / Windows Server 2012 R2
  smb_check_rollup(os:"6.3", sp:0, rollup_date:"11_2016", bulletin:bulletin, rollup_kb_list:make_list(3197873, 3197874)) ||
  # Windows 10
  smb_check_rollup(os:"10", sp:0, os_build:"10240", rollup_date:"11_2016", bulletin:bulletin, rollup_kb_list:make_list(3198585)) ||
  smb_check_rollup(os:"10", sp:0, os_build:"10586", rollup_date:"11_2016", bulletin:bulletin, rollup_kb_list:make_list(3198586)) ||
  smb_check_rollup(os:"10", sp:0, os_build:"14393", rollup_date:"11_2016", bulletin:bulletin, rollup_kb_list:make_list(3200970))
)
{
  set_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_warning();
  hotfix_check_fversion_end();
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, hotfix_get_audit_report());
}

References