Vulnerabilities > CVE-2016-4675 - Permissions, Privileges, and Access Controls vulnerability in Apple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
An issue was discovered in certain Apple products. iOS before 10.1 is affected. macOS before 10.12.1 is affected. tvOS before 10.0.1 is affected. watchOS before 3.1 is affected. The issue involves the "libxpc" component. It allows attackers to execute arbitrary code in a privileged context via a crafted app.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Accessing, Modifying or Executing Executable Files An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
- Leverage Executable Code in Non-Executable Files An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
- Blue Boxing This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
- Restful Privilege Elevation Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
- Target Programs with Elevated Privileges This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
Nessus
NASL family Misc. NASL id APPLETV_10_0_1.NASL description According to its banner, the version of Apple TV on the remote device is prior to 10.0.1. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in WebKit when handling the location attribute that allows an unauthenticated, remote attacker to bypass the cross-origin policies and disclose sensitive user information. (CVE-2016-4613) - An out-of-bounds read error exists in the FontParser component when handling specially crafted font files that allows an unauthenticated, remote attacker to disclose sensitive information. (CVE-2016-4660) - An unspecified flaw exists in the Sandbox Profiles component that allows a local attacker, via a specially crafted application, to disclose the metadata of photo directories. (CVE-2016-4664) - An unspecified flaw exists in the Sandbox Profiles component that allows a local attacker, via a specially crafted application, to disclose the metadata of audio recordings. (CVE-2016-4665) - Multiple memory corruption issues exist in Webkit due to improper validation of user-supplied input. An unauthenticated, remote attacker can exploit these to execute arbitrary code. (CVE-2016-4666, CVE-2016-4677, CVE-2016-7578) - Multiple unspecified flaws exist in the System Boot component, within MIG generated code, due to improper validation of input. A local attacker can exploit these to terminate the system or execute arbitrary code with elevated privileges. (CVE-2016-4669) - A memory corruption issue exists in the CoreGraphics component when handling specially crafted JPEG files. An unauthenticated, remote attacker can exploit this, via a specially crafted file, to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-4673) - An unspecified logic issue exists in libxpc that allows a local attacker to execute arbitrary code with root privileges. (CVE-2016-4675) - A flaw exists in libarchive due to improper path validation when creating temporary files during archive extraction. An unauthenticated, remote attacker can exploit this, via a symlink attack, to overwrite arbitrary files. (CVE-2016-4679) - An unspecified flaw exists in the Kernel component due to improper sanitization of input. A local attacker can exploit this to disclose kernel memory contents. (CVE-2016-4680) - An overflow condition exists in the FontParser component due to improper validation when parsing font files. An unauthenticated, remote attacker can exploit this to cause a buffer overflow, resulting in a denial of service condition or the execution of arbitrary code. (CVE-2016-4688) - A flaw exists in the CFNetwork Proxies component when handling proxy credentials that allows a man-in-the-middle attacker to disclose sensitive user information. (CVE-2016-7579) - A flaw exists in the AppleMobileFileIntegrity component due to improper validation of code signatures. A local attacker can exploit this to have a signed executable substitute code with the same team ID. (CVE-2016-7584) - Multiple race conditions exist in various IOKit drivers related to how they use task struct pointers. A local attacker can exploit this to execute arbitrary code with kernel-level privileges. (CVE-2016-7613) Note that only 4th generation models are affected by these vulnerabilities. last seen 2020-06-01 modified 2020-06-02 plugin id 94337 published 2016-10-27 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94337 title Apple TV < 10.0.1 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(94337); script_version("1.10"); script_cvs_date("Date: 2019/11/14"); script_cve_id( "CVE-2016-4613", "CVE-2016-4660", "CVE-2016-4664", "CVE-2016-4665", "CVE-2016-4666", "CVE-2016-4669", "CVE-2016-4673", "CVE-2016-4675", "CVE-2016-4677", "CVE-2016-4679", "CVE-2016-4680", "CVE-2016-4688", "CVE-2016-7578", "CVE-2016-7579", "CVE-2016-7584", "CVE-2016-7613" ); script_bugtraq_id( 93849, 93851, 93853, 93854, 93856, 93949, 94116, 94571, 94572 ); script_name(english:"Apple TV < 10.0.1 Multiple Vulnerabilities"); script_summary(english:"Checks the build number."); script_set_attribute(attribute:"synopsis", value: "The remote Apple TV device is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "According to its banner, the version of Apple TV on the remote device is prior to 10.0.1. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in WebKit when handling the location attribute that allows an unauthenticated, remote attacker to bypass the cross-origin policies and disclose sensitive user information. (CVE-2016-4613) - An out-of-bounds read error exists in the FontParser component when handling specially crafted font files that allows an unauthenticated, remote attacker to disclose sensitive information. (CVE-2016-4660) - An unspecified flaw exists in the Sandbox Profiles component that allows a local attacker, via a specially crafted application, to disclose the metadata of photo directories. (CVE-2016-4664) - An unspecified flaw exists in the Sandbox Profiles component that allows a local attacker, via a specially crafted application, to disclose the metadata of audio recordings. (CVE-2016-4665) - Multiple memory corruption issues exist in Webkit due to improper validation of user-supplied input. An unauthenticated, remote attacker can exploit these to execute arbitrary code. (CVE-2016-4666, CVE-2016-4677, CVE-2016-7578) - Multiple unspecified flaws exist in the System Boot component, within MIG generated code, due to improper validation of input. A local attacker can exploit these to terminate the system or execute arbitrary code with elevated privileges. (CVE-2016-4669) - A memory corruption issue exists in the CoreGraphics component when handling specially crafted JPEG files. An unauthenticated, remote attacker can exploit this, via a specially crafted file, to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-4673) - An unspecified logic issue exists in libxpc that allows a local attacker to execute arbitrary code with root privileges. (CVE-2016-4675) - A flaw exists in libarchive due to improper path validation when creating temporary files during archive extraction. An unauthenticated, remote attacker can exploit this, via a symlink attack, to overwrite arbitrary files. (CVE-2016-4679) - An unspecified flaw exists in the Kernel component due to improper sanitization of input. A local attacker can exploit this to disclose kernel memory contents. (CVE-2016-4680) - An overflow condition exists in the FontParser component due to improper validation when parsing font files. An unauthenticated, remote attacker can exploit this to cause a buffer overflow, resulting in a denial of service condition or the execution of arbitrary code. (CVE-2016-4688) - A flaw exists in the CFNetwork Proxies component when handling proxy credentials that allows a man-in-the-middle attacker to disclose sensitive user information. (CVE-2016-7579) - A flaw exists in the AppleMobileFileIntegrity component due to improper validation of code signatures. A local attacker can exploit this to have a signed executable substitute code with the same team ID. (CVE-2016-7584) - Multiple race conditions exist in various IOKit drivers related to how they use task struct pointers. A local attacker can exploit this to execute arbitrary code with kernel-level privileges. (CVE-2016-7613) Note that only 4th generation models are affected by these vulnerabilities."); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT207270"); script_set_attribute(attribute:"solution", value: "Upgrade to Apple TV version 10.0.1 or later. Note that this update is only available for 4th generation models."); 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:L/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-2016-7613"); 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:"2016/10/24"); script_set_attribute(attribute:"patch_publication_date", value:"2016/10/24"); script_set_attribute(attribute:"plugin_publication_date", value:"2016/10/27"); script_set_attribute(attribute:"plugin_type", value:"remote"); script_set_attribute(attribute:"cpe", value:"cpe:/a:apple:apple_tv"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Misc."); script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("appletv_version.nasl"); script_require_keys("AppleTV/Version", "AppleTV/Model", "AppleTV/URL", "AppleTV/Port"); script_require_ports("Services/www", 7000); exit(0); } include("audit.inc"); include("appletv_func.inc"); url = get_kb_item('AppleTV/URL'); if (empty_or_null(url)) exit(0, 'Cannot determine Apple TV URL.'); port = get_kb_item('AppleTV/Port'); if (empty_or_null(port)) exit(0, 'Cannot determine Apple TV port.'); build = get_kb_item('AppleTV/Version'); if (empty_or_null(build)) audit(AUDIT_UNKNOWN_DEVICE_VER, 'Apple TV'); model = get_kb_item('AppleTV/Model'); if (empty_or_null(model)) exit(0, 'Cannot determine Apple TV model.'); fixed_build = "14U71"; tvos_ver = '10.0.1'; # determine gen from the model gen = APPLETV_MODEL_GEN[model]; appletv_check_version( build : build, fix : fixed_build, affected_gen : 4, fix_tvos_ver : tvos_ver, model : model, gen : gen, port : port, url : url, severity : SECURITY_HOLE );NASL family MacOS X Local Security Checks NASL id MACOS_10_12_1.NASL description The remote host is running a version of Mac OS X that is 10.12.x prior to macOS 10.12.1. It is, therefore, affected by multiple vulnerabilities in the following components : - ATS - AppleMobileFileIntegrity - AppleSMC - CFNetwork Proxies - CoreGraphics - FaceTime - FontParser - IDS - Connectivity - Kernel - libarchive - libxpc - ntfs - Security - Thunderbolt Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 94253 published 2016-10-25 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94253 title macOS 10.12.x < 10.12.1 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(94253); script_version("1.13"); script_cvs_date("Date: 2019/11/14"); script_cve_id( "CVE-2016-4660", "CVE-2016-4661", "CVE-2016-4667", "CVE-2016-4669", "CVE-2016-4670", "CVE-2016-4673", "CVE-2016-4674", "CVE-2016-4675", "CVE-2016-4678", "CVE-2016-4679", "CVE-2016-4688", "CVE-2016-4721", "CVE-2016-4780", "CVE-2016-7577", "CVE-2016-7579", "CVE-2016-7584", "CVE-2016-7613" ); script_bugtraq_id( 93849, 93852, 93856, 94116, 94429, 94433, 94571, 94572, 96332 ); script_xref(name:"APPLE-SA", value:"APPLE-SA-2016-10-24-2"); script_name(english:"macOS 10.12.x < 10.12.1 Multiple Vulnerabilities"); 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 10.12.x prior to macOS 10.12.1. It is, therefore, affected by multiple vulnerabilities in the following components : - ATS - AppleMobileFileIntegrity - AppleSMC - CFNetwork Proxies - CoreGraphics - FaceTime - FontParser - IDS - Connectivity - Kernel - libarchive - libxpc - ntfs - Security - Thunderbolt 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/HT207275"); # http://lists.apple.com/archives/security-announce/2016/Oct/msg00001.html script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d9a074e5"); script_set_attribute(attribute:"solution", value: "Upgrade to macOS version 10.12.1 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:L/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-2016-7613"); 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:"2016/10/24"); script_set_attribute(attribute:"patch_publication_date", value:"2016/10/24"); script_set_attribute(attribute:"plugin_publication_date", value:"2016/10/25"); 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_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", "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 = eregmatch(pattern:"Mac OS X ([0-9]+(\.[0-9]+)+)", string:os); if (isnull(matches)) exit(1, "Failed to parse the macOS / Mac OS X version ('" + os + "')."); version = matches[1]; if (version !~ "^10\.12($|[^0-9])") audit(AUDIT_INST_VER_NOT_VULN, "macOS / Mac OS X", version); fixed_version = "10.12.1"; if (ver_compare(ver:version, fix:fixed_version, 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);
References
- http://www.securityfocus.com/bid/93849
- http://www.securityfocus.com/bid/93849
- http://www.securitytracker.com/id/1037086
- http://www.securitytracker.com/id/1037086
- https://support.apple.com/HT207269
- https://support.apple.com/HT207269
- https://support.apple.com/HT207270
- https://support.apple.com/HT207270
- https://support.apple.com/HT207271
- https://support.apple.com/HT207271
- https://support.apple.com/HT207275
- https://support.apple.com/HT207275