Vulnerabilities > CVE-2016-6926 - Use After Free vulnerability in Adobe Flash Player

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

include("compat.inc");

if (description)
{
  script_id(93475);
  script_version("1.15");
  script_cvs_date("Date: 2019/11/14");

  script_cve_id(
    "CVE-2016-4271",
    "CVE-2016-4272",
    "CVE-2016-4274",
    "CVE-2016-4275",
    "CVE-2016-4276",
    "CVE-2016-4277",
    "CVE-2016-4278",
    "CVE-2016-4279",
    "CVE-2016-4280",
    "CVE-2016-4281",
    "CVE-2016-4282",
    "CVE-2016-4283",
    "CVE-2016-4284",
    "CVE-2016-4285",
    "CVE-2016-4287",
    "CVE-2016-6921",
    "CVE-2016-6922",
    "CVE-2016-6923",
    "CVE-2016-6924",
    "CVE-2016-6925",
    "CVE-2016-6926",
    "CVE-2016-6927",
    "CVE-2016-6929",
    "CVE-2016-6930",
    "CVE-2016-6931",
    "CVE-2016-6932"
  );
  script_xref(name:"MSFT", value:"MS16-117");
  script_xref(name:"MSKB", value:"3188128");

  script_name(english:"MS16-117: Security Update for Adobe Flash Player (3188128)");
  script_summary(english:"Checks the version of the ActiveX control.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host has a browser plugin installed that is
affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host is missing KB3188128. It is, therefore,
affected by multiple vulnerabilities :

  - Multiple security bypass vulnerabilities exist that
    allow an unauthenticated, remote attacker to disclose
    sensitive information. (CVE-2016-4271, CVE-2016-4277,
    CVE-2016-4278)

  - Multiple use-after-free errors exist that allow an
    unauthenticated, remote attacker to execute arbitrary
    code. (CVE-2016-4272, CVE-2016-4279, CVE-2016-6921,
    CVE-2016-6923, CVE-2016-6925, CVE-2016-6926,
    CVE-2016-6927, CVE-2016-6929, CVE-2016-6930,
    CVE-2016-6931, CVE-2016-6932)

  - Multiple memory corruption issues exist that allow an
    unauthenticated, remote attacker to execute arbitrary
    code. (CVE-2016-4274, CVE-2016-4275, CVE-2016-4276,
    CVE-2016-4280, CVE-2016-4281, CVE-2016-4282,
    CVE-2016-4283, CVE-2016-4284, CVE-2016-4285,
    CVE-2016-6922, CVE-2016-6924)

  - An integer overflow condition exists that allows an
    unauthenticated, remote attacker to execute arbitrary
    code. (CVE-2016-4287)

Note that Nessus has not tested for these issues but has instead
relied only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2016/ms16-117");
  script_set_attribute(attribute:"see_also", value:"https://helpx.adobe.com/security/products/flash-player/apsb16-29.html");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Windows 2012, 8.1, RT 8.1,
2012 R2, and 10.");
  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: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-2016-6932");

  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:"2016/09/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:adobe:flash_player");
  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_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_activex_func.inc");
include("misc_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = "MS16-117";
kbs = make_list("3188128");
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");
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);
if (hotfix_check_server_core() == 1) audit(AUDIT_WIN_SERVER_CORE);

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);

if (activex_init() != ACX_OK) audit(AUDIT_FN_FAIL, "activex_init()");

# Adobe Flash Player CLSID
clsid = '{D27CDB6E-AE6D-11cf-96B8-444553540000}';

file = activex_get_filename(clsid:clsid);
if (isnull(file))
{
  activex_end();
  audit(AUDIT_FN_FAIL, "activex_get_filename", "NULL");
}
if (!file)
{
  activex_end();
  audit(AUDIT_ACTIVEX_NOT_FOUND, clsid);
}

# Get its version.
version = activex_get_fileversion(clsid:clsid);
if (!version)
{
  activex_end();
  audit(AUDIT_VER_FAIL, file);
}

info = '';

iver = split(version, sep:'.', keep:FALSE);
for (i=0; i<max_index(iver); i++)
 iver[i] = int(iver[i]);
iver = join(iver, sep:".");

# all <= 18.0.0.375 or 19 <= 23.0.0.162
fix = FALSE;
if(iver =~ "^(19|2[01])\." && ver_compare(ver:iver, fix:"23.0.0.162", strict:FALSE) == -1)
  fix = "23.0.0.162";
else if(ver_compare(ver:iver, fix:"18.0.0.375", strict:FALSE) <= 0)
  fix = "18.0.0.375";

if (
  (report_paranoia > 1 || activex_get_killbit(clsid:clsid) == 0) &&
  fix
)
{
  info = '\n  Path              : ' + file +
         '\n  Installed version : ' + version +
         '\n  Fixed version     : ' + fix +
         '\n';
}

port = kb_smb_transport();

if (info != '')
{
  if (report_paranoia > 1)
  {
    report = info +
      '\n' +
      'Note, though, that Nessus did not check whether the kill bit was\n' +
      "set for the control's CLSID because of the Report Paranoia setting" + '\n' +
      'in effect when this scan was run.\n';
  }
  else
  {
    report = info +
      '\n' +
      'Moreover, its kill bit is not set so it is accessible via Internet\n' +
      'Explorer.\n';
  }
  set_kb_item(name:"SMB/Missing/"+bulletin, value:TRUE);
  hotfix_add_report(bulletin:'MS16-117', kb:'3188128', report);
  security_report_v4(severity:SECURITY_HOLE, port:port, extra:hotfix_get_report());
}
else audit(AUDIT_HOST_NOT, 'affected');