About the security content of OS X El Capitan v10.11.6 and Security Update 2016-004

This document describes the security content of OS X El Capitan v10.11.6 and Security Update 2016-004.

About Apple security updates

For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.

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Apple security documents reference vulnerabilities by CVE-ID when possible.

OS X El Capitan v10.11.6 and Security Update 2016-004

apache_mod_php

Available for: OS X Yosemite v10.10.5 and OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to execute arbitrary code

Description: Multiple issues existed in PHP versions prior to 5.5.36. These were addressed by updating PHP to version 5.5.36.

CVE-2016-5093

CVE-2016-5094

CVE-2016-5096

CVE-2013-7456

Audio

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to cause a system denial of service

Description: A null pointer dereference was addressed through improved input validation.

CVE-2016-4649 : Juwei Lin(@fuzzerDOTcn) of Trend Micro

Audio

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to execute arbitrary code with kernel privileges

Description: A memory corruption issue was addressed through improved memory handling.

CVE-2016-4647 : Juwei Lin(@fuzzerDOTcn) of Trend Micro

Audio

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to determine kernel memory layout

Description: An out-of-bounds read was addressed through improved input validation.

CVE-2016-4648 : Juwei Lin(@fuzzerDOTcn) of Trend Micro; Jack Tang and Moony Li of Trend Micro working with Trend Micro's Zero Day Initiative

Audio

Available for: OS X El Capitan v10.11 and later

Impact: Parsing a maliciously crafted audio file may lead to the disclosure of user information

Description: An out-of-bounds read was addressed through improved bounds checking.

CVE-2016-4646 : Steven Seeley of Source Incite working with Trend Micro's Zero Day Initiative

bsdiff

Available for: OS X El Capitan v10.11 and later

Impact: A local attacker may be able to cause unexpected application termination or arbitrary code execution

Description: An integer overflow existed in bspatch. This issue was addressed through improved bounds checking.

CVE-2014-9862 : an anonymous researcher

CFNetwork

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to view sensitive user information

Description: A permissions issue existed in the handling of web browser cookies. This issue was addressed through improved restrictions.

CVE-2016-4645 : Abhinav Bansal of Zscaler Inc.

CFNetwork Credentials

Available for: OS X El Capitan v10.11 and later

Impact: An attacker in a privileged network position may be able to leak sensitive user information

Description: A downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.

CVE-2016-4644 : Jerry Decime coordinated via CERT

CFNetwork Proxies

Available for: OS X El Capitan v10.11 and later

Impact: An attacker in a privileged network position may be able to leak sensitive user information

Description: A validation issue existed in the parsing of 407 responses. This issue was addressed through improved response validation.

CVE-2016-4643 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua University; Jerry Decime coordinated via CERT

CFNetwork Proxies

Available for: OS X El Capitan v10.11 and later

Impact: An application may unknowingly send a password unencrypted over the network

Description: Proxy authentication incorrectly reported HTTP proxies received credentials securely. This issue was addressed through improved warnings.

CVE-2016-4642 : Jerry Decime coordinated via CERT

CoreGraphics

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to elevate privileges

Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed through improved input validation.

CVE-2016-4652 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative

CoreGraphics

Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to execute arbitrary code

Description: A memory corruption issue was addressed through improved memory handling.

CVE-2016-4637 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)

FaceTime

Available for: OS X El Capitan v10.11 and later

Impact: An attacker in a privileged network position may be able to cause a relayed call to continue transmitting audio while appearing as if the call terminated

Description: User interface inconsistencies existed in the handling of relayed calls. These issues were addressed through improved FaceTime display logic.

CVE-2016-4635 : Martin Vigo

Graphics Drivers

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to execute arbitrary code with kernel privileges

Description: A memory corruption issue was addressed through improved input validation.

CVE-2016-4634 : Stefan Esser of SektionEins

ImageIO

Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to execute arbitrary code

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-4629 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)

CVE-2016-4630 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)

ImageIO

Available for: OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to cause a denial of service

Description: A memory consumption issue was addressed through improved memory handling.

CVE-2016-4632 : Evgeny Sidorov of Yandex

ImageIO

Available for: OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to execute arbitrary code

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-4631 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)

ImageIO

Available for: OS X El Capitan v10.11 and later

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: A memory corruption issue was addressed through improved memory handling.

CVE-2016-7705 : Craig Young of Tripwire VERT

Intel Graphics Driver

Available for: OS X El Capitan v10.11 and later

Impact: A malicious application may be able to execute arbitrary code with kernel privileges

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-4633 : Marco Grassi (@marcograss) of KeenLab (@keen_lab), Tencent

IOHIDFamily

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to execute arbitrary code with kernel privileges

Description: A null pointer dereference was addressed through improved input validation.

CVE-2016-4626 : Stefan Esser of SektionEins

IOSurface

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to execute arbitrary code with kernel privileges

Description: A use-after-free was addressed through improved memory management.

CVE-2016-4625 : Ian Beer of Google Project Zero

Kernel

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to execute arbitrary code with kernel privileges

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-1863 : Ian Beer of Google Project Zero

CVE-2016-4653 : Ju Zhu of Trend Micro

CVE-2016-4582 : Shrek_wzw and Proteas of Qihoo 360 Nirvan Team

Kernel

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to cause a system denial of service

Description: A null pointer dereference was addressed through improved input validation.

CVE-2016-1865 : Marco Grassi (@marcograss) of KeenLab (@keen_lab), Tencent, CESG

Libc

Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution

Description: A buffer overflow existed within the "link_ntoa()" function in linkaddr.c. This issue was addressed through additional bounds checking.

CVE-2016-6559 : Apple

libc++abi

Available for: OS X El Capitan v10.11 and later

Impact: An application may be able to execute arbitrary code with root privileges

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-4621 : an anonymous researcher

libexpat

Available for: OS X El Capitan v10.11 and later

Impact: Processing maliciously crafted XML may lead to unexpected application termination or arbitrary code execution

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-0718 : Gustavo Grieco

LibreSSL

Available for: OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to execute arbitrary code

Description: Multiple issues existed in LibreSSL before 2.2.7. These were addressed by updating LibreSSL to version 2.2.7.

CVE-2016-2108 : Huzaifa Sidhpurwala (Red Hat), Hanno Böck, David Benjamin (Google), Mark Brand and Ian Beer of Google Project Zero

CVE-2016-2109 : Brian Carpenter

libxml2

Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later

Impact: Multiple vulnerabilities in libxml2

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2015-8317 : Hanno Boeck

CVE-2016-1836 : Wei Lei and Liu Yang of Nanyang Technological University

CVE-2016-4447 : Wei Lei and Liu Yang of Nanyang Technological University

CVE-2016-4448 : Apple

CVE-2016-4483 : Gustavo Grieco

CVE-2016-4614 : Nick Wellnhofer

CVE-2016-4615 : Nick Wellnhofer

CVE-2016-4616 : Michael Paddon

libxml2

Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later

Impact: Parsing a maliciously crafted XML document may lead to disclosure of user information

Description: An access issue existed in the parsing of maliciously crafted XML files. This issue was addressed through improved input validation.

CVE-2016-4449 : Kostya Serebryany

libxslt

Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later

Impact: Multiple vulnerabilities in libxslt

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-1683 : Nicolas Grégoire

CVE-2016-1684 : Nicolas Grégoire

CVE-2016-4607 : Nick Wellnhofer

CVE-2016-4608 : Nicolas Grégoire

CVE-2016-4609 : Nick Wellnhofer

CVE-2016-4610 : Nick Wellnhofer

Login Window

Available for: OS X El Capitan v10.11 and later

Impact: A malicious application may be able to gain root privileges

Description: A type confusion issue was addressed through improved memory handling.

CVE-2016-4638 : Yubin Fu of Tencent KeenLab working with TrendMicro's Zero Day Initiative

Login Window

Available for: OS X El Capitan v10.11 and later

Impact: A malicious application may be able to execute arbitrary code leading to compromise of user information

Description: A memory corruption issue was addressed through improved input validation.

CVE-2016-4640 : an anonymous researcher working with Trend Micro’s Zero Day Initiative

Login Window

Available for: OS X El Capitan v10.11 and later

Impact: A malicious application may be able to execute arbitrary code leading to the compromise of user information

Description: A type confusion issue was addressed through improved memory handling.

CVE-2016-4641 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative

Login Window

Available for: OS X El Capitan v10.11 and later

Impact: A local user may be able to cause a denial of service

Description: A memory initialization issue was addressed through improved memory handling.

CVE-2016-4639 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative

OpenSSL

Available for: OS X El Capitan v10.11 and later

Impact: A remote attacker may be able to execute arbitrary code

Description: Multiple issues existed in OpenSSL. These issues were resolved by backporting the fixes from OpenSSL 1.0.2h/1.0.1 to OpenSSL 0.9.8.

CVE-2016-2105 : Guido Vranken

CVE-2016-2106 : Guido Vranken

CVE-2016-2107 : Juraj Somorovsky

CVE-2016-2108 : Huzaifa Sidhpurwala (Red Hat), Hanno Böck, David Benjamin (Google), Mark Brand and Ian Beer of Google Project Zero

CVE-2016-2109 : Brian Carpenter

CVE-2016-2176 : Guido Vranken

QuickTime

Available for: OS X El Capitan v10.11 and later

Impact: Processing a maliciously crafted SGI file may lead to arbitrary code execution

Description: A memory corruption issue was addressed through improved input validation.

CVE-2016-4601 : Ke Liu of Tencent's Xuanwu Lab

QuickTime

Available for: OS X El Capitan v10.11 and later

Impact: Processing a maliciously crafted Photoshop document may lead to unexpected application termination or arbitrary code execution

Description: A memory corruption issue was addressed through improved input validation.

CVE-2016-4599 : Ke Liu of Tencent's Xuanwu Lab

QuickTime

Available for: OS X El Capitan v10.11 and later

Impact: Processing a maliciously crafted FlashPix Bitmap Image may lead to unexpected application termination or arbitrary code execution

Description: Multiple memory corruption issues were addressed through improved memory handling.

CVE-2016-4596 : Ke Liu of Tencent's Xuanwu Lab

CVE-2016-4597 : Ke Liu of Tencent's Xuanwu Lab

CVE-2016-4600 : Ke Liu of Tencent's Xuanwu Lab

CVE-2016-4602 : Ke Liu of Tencent's Xuanwu Lab

QuickTime

Available for: OS X El Capitan v10.11 and later

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: A memory corruption issue was addressed through improved input validation.

CVE-2016-4598 : Ke Liu of Tencent's Xuanwu Lab

Safari Login AutoFill

Available for: OS X El Capitan v10.11 and later

Impact: A user's password may be visible on screen

Description: An issue existed in Safari's password auto-fill. This issue was addressed through improved matching of form fields.

CVE-2016-4595 : Jonathan Lewis from DeARX Services (PTY) LTD

Sandbox Profiles

Available for: OS X El Capitan v10.11 and later

Impact: A local application may be able to access the process list

Description: An access issue existed with privileged API calls. This issue was addressed through additional restrictions.

CVE-2016-4594 : Stefan Esser of SektionEins