Vulnerabilities > CVE-2016-4656 - Out-of-bounds Write vulnerability in Apple Iphone OS

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4655
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4656
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4657
• https://blog.lookout.com/trident-pegasus
• https://citizenlab.ca/2016/08/million-dollar-dissident-iphone-zero-day-nso-group-uae/
• https://www.blackhat.com/docs/eu-16/materials/eu-16-Bazaliy-Mobile-Espionage-in-the-Wild-Pegasus-and-Nation-State-Level-Attacks.pdf
• https://github.com/Siguza/PhoenixNonce
• https://jndok.github.io/2016/10/04/pegasus-writeup/
• https://sektioneins.de/en/blog/16-09-02-pegasus-ios-kernel-vulnerability-explained.html
• https://github.com/benjamin-42/Trident
• http://blog.tihmstar.net/2018/01/modern-post-exploitation-techniques.html

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

include("compat.inc");

if (description)
{
  script_id(93317);
  script_version("1.10");
  script_cvs_date("Date: 2018/07/14  1:59:36");

  script_cve_id("CVE-2016-4655", "CVE-2016-4656");
  script_bugtraq_id(92651, 92652);
  script_xref(name:"APPLE-SA", value:"APPLE-SA-2016-09-01-2");

  script_name(english:"Mac OS X Multiple Vulnerabilities (Security Updates 2016-001 / 2016-005)");
  script_summary(english:"Checks for the presence of Security Update 2016-001 and 2016-005.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a Mac OS X update that fixes multiple
security vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote host is running a version of Mac OS X 10.10.5 or 10.11.6
that is missing a security update. It is therefore, affected by
multiple vulnerabilities in the Kernel component :

  - An unspecified flaw exists due to improper validation of
    user-supplied input. An attacker can exploit this, by
    convincing a user to run a specially crafted
    application, to disclose kernel memory contents.
    (CVE-2016-4655)

  - An unspecified flaw exists due to improper validation of
    certain input. An attacker can exploit this, by
    convincing a user to run a specially crafted
    application, to execute arbitrary code with kernel level
    privileges. (CVE-2016-4656)");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT207130");
  # http://lists.apple.com/archives/security-announce/2016/Sep/msg00001.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?faffe2b4");
  script_set_attribute(attribute:"solution", value:
"Install Security Update 2016-005 (OS X 10.10.5) / 2016-001 (OS X
10.11.6) or later.");
  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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'WebKit not_number defineProperties UAF');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/08/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/MacOSX/Version", "Host/MacOSX/packages/boms");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

# Compare 2 patch numbers to determine if patch requirements are satisfied.
# Return true if this patch or a later patch is applied
# Return false otherwise
function check_patch(year, number)
{
  local_var p_split = split(patch, sep:"-");
  local_var p_year  = int( p_split[0]);
  local_var p_num   = int( p_split[1]);

  if (year >  p_year) return TRUE;
  else if (year <  p_year) return FALSE;
  else if (number >=  p_num) return TRUE;
  else return FALSE;
}

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

# Advisory states that update 2016-005 is available for 10.10.5 and update 2016-001 is available for 10.11.6
os = get_kb_item("Host/MacOSX/Version");
if (!os) audit(AUDIT_OS_NOT, "Mac OS X");
if (!ereg(pattern:"Mac OS X 10\.(10\.5|11\.6)([^0-9]|$)", string:os)) audit(AUDIT_OS_NOT, "Mac OS X 10.10.5 or Mac OS X 10.11.6");

if ( "10.10.5" >< os) patch = "2016-005";
else if ( "10.11.6" >< os ) patch = "2016-001";

packages = get_kb_item_or_exit("Host/MacOSX/packages/boms", exit_code:1);
sec_boms_report = egrep(pattern:"^com\.apple\.pkg\.update\.(security\.|os\.SecUpd).*bom$", string:packages);
sec_boms = split(sec_boms_report, sep:'\n');

foreach package (sec_boms)
{
  # Grab patch year and number
  match = eregmatch(pattern:"[^0-9](20[0-9][0-9])[-.]([0-9]{3})[^0-9]", string:package);
  if (empty_or_null(match[1]) || empty_or_null(match[2]))
    continue;

  patch_found = check_patch(year:int(match[1]), number:int(match[2]));
  if (patch_found) exit(0, "The host has Security Update " + patch + " or later installed and is therefore not affected.");
}

report =  '\n  Missing security update : ' + patch;
report += '\n  Installed security BOMs : ';
if (sec_boms_report) report += str_replace(find:'\n', replace:'\n                            ', string:sec_boms_report);
else report += 'n/a';
report += '\n';

security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);