Vulnerabilities > CVE-2016-7596 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Apple mac OS X

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
apple
CWE-119
nessus
NVD
Published: 2017-02-20
Updated: 2017-07-27

Summary

An issue was discovered in certain Apple products. macOS before 10.12.2 is affected. The issue involves the "Bluetooth" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.

Vulnerable Configurations

Part Description Count
OS
Apple
113

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.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyMacOS X Local Security Checks
    NASL idMACOSX_SECUPD2016-007.NASL
    descriptionThe 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 : - A denial of service vulnerability exists in the ssl_parse_clienthello_tlsext() function within file ssl/t1_lib.c when handling oversize OCSP Status Request extensions from clients. An unauthenticated, remote attacker can exploit this to cause memory exhaustion in a process linked with the library. (CVE-2016-6304) - A memory corruption issue exists in Bluetooth due to improper validation of user-supplied input. A local attacker can exploit this, via a specially crafted application, to cause a denial of service condition or the execution of arbitrary code with kernel level privileges. (CVE-2016-7596) - A NULL pointer dereference flaw exists in the CoreCapture component due to improper validation of user-supplied input. A local attacker can exploit this to cause a denial of service condition. (CVE-2016-7604)
    last seen2020-06-01
    modified2020-06-02
    plugin id95918
    published2016-12-16
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95918
    titleMac OS X Multiple Vulnerabilities (Security Updates 2016-003 / 2016-007)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(95918);
  script_version("1.4");
  script_cvs_date("Date: 2019/11/13");

  script_cve_id("CVE-2016-6304", "CVE-2016-7596", "CVE-2016-7604");
  script_bugtraq_id(93150, 94903);
  script_xref(name:"APPLE-SA", value:"APPLE-SA-2016-12-13-1");

  script_name(english:"Mac OS X Multiple Vulnerabilities (Security Updates 2016-003 / 2016-007)");
  script_summary(english:"Checks for the presence of Security Update 2016-003 and 2016-007.");

  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 :

  - A denial of service vulnerability exists in the
    ssl_parse_clienthello_tlsext() function within file
    ssl/t1_lib.c when handling oversize OCSP Status Request
    extensions from clients. An unauthenticated, remote
    attacker can exploit this to cause memory exhaustion in
    a process linked with the library. (CVE-2016-6304)

  - A memory corruption issue exists in Bluetooth due to
    improper validation of user-supplied input. A local
    attacker can exploit this, via a specially crafted
    application, to cause a denial of service condition or
    the execution of arbitrary code with kernel level
    privileges. (CVE-2016-7596)

  - A NULL pointer dereference flaw exists in the
    CoreCapture component due to improper validation of
    user-supplied input. A local attacker can exploit this
    to cause a denial of service condition. (CVE-2016-7604)");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT207423");
  # http://lists.apple.com/archives/security-announce/2016/Dec/msg00003.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?38dabd46");
  script_set_attribute(attribute:"solution", value:
"Install Security Update 2016-007 (OS X 10.10.5) / 2016-003 (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:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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-2016-7596");

  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:"2016/09/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/16");

  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) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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);

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 = "2016-007";
else if ( "10.11.6" >< os ) patch = "2016-003";

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);
  • NASL familyMacOS X Local Security Checks
    NASL idMACOS_10_12_2.NASL
    descriptionThe remote host is running a version of macOS that is 10.12.x prior to 10.12.2. It is, therefore, affected by multiple vulnerabilities in the following components : - apache_mod_php - AppleGraphicsPowerManagement - Assets - Audio - Bluetooth - CoreCapture - CoreFoundation - CoreGraphics - CoreMedia External Displays - CoreMedia Playback - CoreStorage - CoreText - curl - Directory Services - Disk Images - FontParser - Foundation - Grapher - ICU - ImageIO - Intel Graphics Driver - IOFireWireFamily - IOAcceleratorFamily - IOHIDFamily - IOKit - IOSurface - Kernel - kext tools - libarchive - LibreSSL - OpenLDAP - OpenPAM - OpenSSL - Power Management - Security - syslog - WiFi - xar Note that successful exploitation of the most serious issues can result in arbitrary code execution. Furthermore, CVE-2016-6304, CVE-2016-7596, and CVE-2016-7604 also affect Mac OS X versions 10.10.5 and 10.11.6. However, this plugin does not check those versions.
    last seen2020-06-01
    modified2020-06-02
    plugin id95917
    published2016-12-16
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95917
    titlemacOS 10.12.x < 10.12.2 Multiple Vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(95917);
  script_version("1.9");
  script_cvs_date("Date: 2020/01/07");

  script_cve_id(
    "CVE-2016-1777",
    "CVE-2016-1823",
    "CVE-2016-4688",
    "CVE-2016-4691",
    "CVE-2016-4693",
    "CVE-2016-5419",
    "CVE-2016-5420",
    "CVE-2016-5421",
    "CVE-2016-6303",
    "CVE-2016-6304",
    "CVE-2016-7141",
    "CVE-2016-7167",
    "CVE-2016-7411",
    "CVE-2016-7412",
    "CVE-2016-7413",
    "CVE-2016-7414",
    "CVE-2016-7416",
    "CVE-2016-7417",
    "CVE-2016-7418",
    "CVE-2016-7588",
    "CVE-2016-7591",
    "CVE-2016-7594",
    "CVE-2016-7595",
    "CVE-2016-7596",
    "CVE-2016-7600",
    "CVE-2016-7602",
    "CVE-2016-7603",
    "CVE-2016-7604",
    "CVE-2016-7605",
    "CVE-2016-7606",
    "CVE-2016-7607",
    "CVE-2016-7608",
    "CVE-2016-7609",
    "CVE-2016-7612",
    "CVE-2016-7615",
    "CVE-2016-7616",
    "CVE-2016-7617",
    "CVE-2016-7618",
    "CVE-2016-7619",
    "CVE-2016-7620",
    "CVE-2016-7621",
    "CVE-2016-7622",
    "CVE-2016-7624",
    "CVE-2016-7625",
    "CVE-2016-7627",
    "CVE-2016-7628",
    "CVE-2016-7629",
    "CVE-2016-7633",
    "CVE-2016-7636",
    "CVE-2016-7637",
    "CVE-2016-7643",
    "CVE-2016-7644",
    "CVE-2016-7655",
    "CVE-2016-7657",
    "CVE-2016-7658",
    "CVE-2016-7659",
    "CVE-2016-7660",
    "CVE-2016-7661",
    "CVE-2016-7662",
    "CVE-2016-7663",
    "CVE-2016-7714",
    "CVE-2016-7742",
    "CVE-2016-7761",
    "CVE-2016-8615",
    "CVE-2016-8616",
    "CVE-2016-8617",
    "CVE-2016-8618",
    "CVE-2016-8619",
    "CVE-2016-8620",
    "CVE-2016-8621",
    "CVE-2016-8622",
    "CVE-2016-8623",
    "CVE-2016-8624",
    "CVE-2016-8625"
  );
  script_bugtraq_id(
    85054,
    90698,
    92292,
    92306,
    92309,
    92754,
    92975,
    92984,
    93004,
    93005,
    93006,
    93007,
    93008,
    93009,
    93011,
    93150,
    94094,
    94096,
    94097,
    94098,
    94100,
    94101,
    94102,
    94103,
    94105,
    94106,
    94107,
    94572,
    94903,
    94904,
    94905,
    94906
  );
  script_xref(name:"APPLE-SA", value:"APPLE-SA-2016-12-13-1");

  script_name(english:"macOS 10.12.x < 10.12.2 Multiple Vulnerabilities");
  script_summary(english:"Checks the version of macOS.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a macOS update that fixes multiple security
vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote host is running a version of macOS that is 10.12.x prior to
10.12.2. It is, therefore, affected by multiple vulnerabilities in the
following components :

  - apache_mod_php
  - AppleGraphicsPowerManagement
  - Assets
  - Audio
  - Bluetooth
  - CoreCapture
  - CoreFoundation
  - CoreGraphics
  - CoreMedia External Displays
  - CoreMedia Playback
  - CoreStorage
  - CoreText
  - curl
  - Directory Services
  - Disk Images
  - FontParser
  - Foundation
  - Grapher
  - ICU
  - ImageIO
  - Intel Graphics Driver
  - IOFireWireFamily
  - IOAcceleratorFamily
  - IOHIDFamily
  - IOKit
  - IOSurface
  - Kernel
  - kext tools
  - libarchive
  - LibreSSL
  - OpenLDAP
  - OpenPAM
  - OpenSSL
  - Power Management
  - Security
  - syslog
  - WiFi
  - xar

Note that successful exploitation of the most serious issues can
result in arbitrary code execution.

Furthermore, CVE-2016-6304, CVE-2016-7596, and CVE-2016-7604 also
affect Mac OS X versions 10.10.5 and 10.11.6. However, this plugin
does not check those versions.");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT207423");
  # http://lists.apple.com/archives/security-announce/2016/Dec/msg00003.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?38dabd46");
  script_set_attribute(attribute:"solution", value:
"Upgrade to macOS version 10.12.2 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:H/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:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-7644");

  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:"2016/03/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/16");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:macos");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "os_fingerprint.nasl");
  script_require_ports("Host/MacOSX/Version", "Host/OS");

  exit(0);
}

include("vcf.inc");
include("vcf_extras_apple.inc");

app_info = vcf::apple::get_macos_info();

vcf::apple::check_macos_restrictions(restrictions:['10.12']);

constraints = [{ "fixed_version" : "10.12.2" }];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);

References