Vulnerabilities > CVE-2017-13847 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Apple Iphone OS

047910
CVSS 7.8 - HIGH
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
local
low complexity
apple
CWE-119
nessus
exploit available
NVD
Published: 2017-12-25
Updated: 2017-12-28

Summary

An issue was discovered in certain Apple products. iOS before 11.2 is affected. macOS before 10.13.2 is affected. The issue involves the "IOKit" 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
302

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.

Exploit-Db

descriptionmacOS/iOS - Multiple Kernel Use-After-Frees due to Incorrect IOKit Object Lifetime Management in IOTimeSyncClockManagerUserClient. CVE-2017-13847. Dos exploi...
fileexploits/multiple/dos/43326.c
idEDB-ID:43326
last seen2017-12-12
modified2017-12-12
platformmultiple
port
published2017-12-12
reporterExploit-DB
sourcehttps://www.exploit-db.com/download/43326/
titlemacOS/iOS - Multiple Kernel Use-After-Frees due to Incorrect IOKit Object Lifetime Management in IOTimeSyncClockManagerUserClient
typedos

Nessus

  • NASL familyMacOS X Local Security Checks
    NASL idMACOS_10_13_2.NASL
    descriptionThe remote host is running a version of Mac OS X that is 10.13.x prior to 10.13.2. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - curl - Directory Utility - IOAcceleratorFamily - IOKit - Intel Graphics Driver - Kernel - Mail - Mail Drafts - OpenSSL - Screen Sharing Server Note that successful exploitation of the most serious issues can result in arbitrary code execution.
    last seen2020-06-01
    modified2020-06-02
    plugin id105080
    published2017-12-07
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/105080
    titlemacOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(105080);
  script_version("1.12");
  script_cvs_date("Date: 2019/06/19 15:17:43");

  script_cve_id(
    "CVE-2017-1000254",
    "CVE-2017-13847",
    "CVE-2017-13848",
    "CVE-2017-13855",
    "CVE-2017-13858",
    "CVE-2017-13860",
    "CVE-2017-13862",
    "CVE-2017-13865",
    "CVE-2017-13867",
    "CVE-2017-13868",
    "CVE-2017-13869",
    "CVE-2017-13871",
    "CVE-2017-13872",
    "CVE-2017-13875",
    "CVE-2017-13876",
    "CVE-2017-13878",
    "CVE-2017-13883",
    "CVE-2017-13886",
    "CVE-2017-13887",
    "CVE-2017-13892",
    "CVE-2017-13904",
    "CVE-2017-13905",
    "CVE-2017-13911",
    "CVE-2017-15422",
    "CVE-2017-3735",
    "CVE-2017-5754",
    "CVE-2017-7151",
    "CVE-2017-7154",
    "CVE-2017-7155",
    "CVE-2017-7158",
    "CVE-2017-7159",
    "CVE-2017-7162",
    "CVE-2017-7163",
    "CVE-2017-7171",
    "CVE-2017-7172",
    "CVE-2017-7173",
    "CVE-2017-9798"
  );
  script_bugtraq_id(
    100515,
    100872,
    101115,
    101981,
    102097,
    102098,
    102099,
    102100,
    102378,
    103134,
    103135
  );
  script_xref(name:"IAVA", value:"2018-A-0019");

  script_name(english:"macOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown)");
  script_summary(english:"Checks the version of Mac OS X / 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 Mac OS X that is 10.13.x
prior to 10.13.2. It is, therefore, affected by multiple
vulnerabilities in the following components :

  - apache
  - curl
  - Directory Utility
  - IOAcceleratorFamily
  - IOKit
  - Intel Graphics Driver
  - Kernel
  - Mail
  - Mail Drafts
  - OpenSSL
  - Screen Sharing Server

Note that successful exploitation of the most serious issues can
result in arbitrary code execution.");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208331");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208394");
  script_set_attribute(attribute:"solution", value:
"Upgrade to macOS version 10.13.2 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-2017-7172");
  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:"metasploit_name", value:'Mac OS X Root Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/07");

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

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

  script_copyright(english:"This script is Copyright (C) 2017-2019 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("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

os = get_kb_item("Host/MacOSX/Version");
if (!os)
{
  os = get_kb_item_or_exit("Host/OS");
  if ("Mac OS X" >!< os) audit(AUDIT_OS_NOT, "macOS / Mac OS X");

  c = get_kb_item("Host/OS/Confidence");
  if (c <= 70) exit(1, "Can't determine the host's OS with sufficient confidence.");
}
if (!os) audit(AUDIT_OS_NOT, "macOS / Mac OS X");

matches = pregmatch(pattern:"Mac OS X ([0-9]+(\.[0-9]+)+)", string:os);
if (empty_or_null(matches)) exit(1, "Failed to parse the macOS / Mac OS X version ('" + os + "').");

version = matches[1];
fixed_version = "10.13.2";

if (version !~"^10\.13($|[^0-9])")
  audit(AUDIT_OS_NOT, "macOS 10.13.x");

if (ver_compare(ver:version, fix:'10.13.2', strict:FALSE) == -1)
{
  security_report_v4(
    port:0,
    severity:SECURITY_HOLE,
    extra:
      '\n  Installed version : ' + version +
      '\n  Fixed version     : ' + fixed_version +
      '\n'
  );
}
else audit(AUDIT_INST_VER_NOT_VULN, "macOS / Mac OS X", version);
  • NASL familyMacOS X Local Security Checks
    NASL idMACOSX_SECUPD2017-005.NASL
    descriptionThe remote host is running Mac OS X 10.11.6 or Mac OS X 10.12.6 and is missing a security update. It is therefore, affected by multiple vulnerabilities affecting the following components : - apache - curl - IOAcceleratorFamily - IOKit - Kernel - OpenSSL - Screen Sharing Server
    last seen2020-06-01
    modified2020-06-02
    plugin id105081
    published2017-12-07
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/105081
    titlemacOS and Mac OS X Multiple Vulnerabilities (Security Update 2017-002 and 2017-005)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(105081);
  script_version("1.10");
  script_cvs_date("Date: 2019/11/12");

  script_cve_id(
    "CVE-2017-3735",
    "CVE-2017-7154",
    "CVE-2017-7158",
    "CVE-2017-7159",
    "CVE-2017-7162",
    "CVE-2017-7172",
    "CVE-2017-7173",
    "CVE-2017-9798",
    "CVE-2017-12837",
    "CVE-2017-13847",
    "CVE-2017-13855",
    "CVE-2017-13862",
    "CVE-2017-13867",
    "CVE-2017-13868",
    "CVE-2017-13869",
    "CVE-2017-13872",
    "CVE-2017-13904",
    "CVE-2017-15422",
    "CVE-2017-1000254"
  );
  script_bugtraq_id(
    100515,
    100860,
    100872,
    101115,
    101981,
    102097,
    102098,
    102100,
    103134,
    103135
  );

  script_name(english:"macOS and Mac OS X Multiple Vulnerabilities (Security Update 2017-002 and 2017-005)");
  script_summary(english:"Checks for the presence of Security Update 2017-002 / 2017-005.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a macOS or Mac OS X security update that
fixes multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote host is running Mac OS X 10.11.6 or Mac OS X 10.12.6 and is
missing a security update. It is therefore, affected by multiple
vulnerabilities affecting the following components :

  - apache
  - curl
  - IOAcceleratorFamily
  - IOKit
  - Kernel
  - OpenSSL
  - Screen Sharing Server");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208331");
  script_set_attribute(attribute:"solution", value:
"Install Security Update 2017-005 or later for 10.11.x or
Security Update 2017-002 or later for 10.12.x.");
  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:"cvss_score_source", value:"CVE-2017-7172");

  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:'Mac OS X Root Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x");
  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) 2017-2019 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;
}

get_kb_item_or_exit("Host/local_checks_enabled");
os = get_kb_item_or_exit("Host/MacOSX/Version");

if (!preg(pattern:"Mac OS X 10\.(11\.6|12\.6)([^0-9]|$)", string:os))
  audit(AUDIT_OS_NOT, "Mac OS X 10.11.6 or Mac OS X 10.12.6");

if ("10.11.6" >< os)
  patch = "2017-005";
else
  patch = "2017-002";

packages = get_kb_item_or_exit("Host/MacOSX/packages/boms", exit_code:1);
sec_boms_report = pgrep(
  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 = pregmatch(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);

Seebug

bulletinFamilyexploit
descriptionIOTimeSyncClockManagerUserClient provides the userspace interface for the IOTimeSyncClockManager IOService. IOTimeSyncClockManagerUserClient overrides the IOUserClient::clientClose method but it treats it like a destructor. IOUserClient::clientClose is not a destructor and plays no role in the lifetime management of an IOKit object. It is perfectly possible to call ::clientClose (via io_service_close) in one thread and call an external method in another thread at the same time. IOTimeSyncClockManagerUserClient::clientClose drops references on a bunch of OSArrays causing them to be free'd, it also destroys the locks which are supposed to protect access to those arrays. This leads directly to multiple UaFs if you also call external methods which manipulate those arrays in other threads. For an exploit some care would be required to ensure correct interleaving such that the OSArray was destroyed and then used *before* the lock which is supposed to be protecting the array is also destroyed, but it would be quite possible. Tested on MacOS 10.13 (17A365) on MacBookAir5,2
idSSV:96988
last seen2017-12-25
modified2017-12-15
published2017-12-15
reporterRoot
sourcehttps://www.seebug.org/vuldb/ssvid-96988
titleMacOS/iOS multiple kernel UAFs due to incorrect IOKit object lifetime management in IOTimeSyncClockManagerUserClient(CVE-2017-13847)

References