About the security content of iOS 4.3

This document describes the security content of iOS 4.3.

This document describes the security content of iOS 4.3, which can be downloaded and installed using iTunes.

For the protection of our customers, Apple does not disclose, discuss, or confirm security issues until a full investigation has occurred and any necessary patches or releases are available. To learn more about Apple Product Security, see the Apple Product Security website.

For information about the Apple Product Security PGP Key, see "How to use the Apple Product Security PGP Key."

Where possible, CVE IDs are used to reference the vulnerabilities for further information.

To learn about other Security Updates, see "Apple Security Updates".

iOS 4.3

• CoreGraphics

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Multiple vulnerabilities in FreeType

  Description: Multiple vulnerabilities existed in FreeType, the most serious of which may lead to arbitrary code execution when processing a maliciously crafted font. These issues are addressed by updating FreeType to version 2.4.3. Further information is available via the FreeType site at http://www.freetype.org/

  CVE-ID

  CVE-2010-3855

• ImageIO

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Viewing a maliciously crafted TIFF image may result in an unexpected application termination or arbitrary code execution

  Description: A buffer overflow existed in libTIFF's handling of JPEG encoded TIFF images. Viewing a maliciously crafted TIFF image may result in an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2011-0191 : Apple

• ImageIO

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Viewing a maliciously crafted TIFF image may result in an unexpected application termination or arbitrary code execution

  Description: A buffer overflow existed in libTIFF's handling of CCITT Group 4 encoded TIFF images. Viewing a maliciously crafted TIFF image may result in an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2011-0192 : Apple

• libxml

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution

  Description: A double free issue existed in libxml's handling of XPath expressions. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2010-4494 : Yang Dingning of NCNIPC, Graduate University of Chinese Academy of Sciences

• Networking

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: A server may be able to identify a device across connections

  Description: The IPv6 address chosen by the device contains the device's MAC address when using stateless address autoconfiguration (SLAAC). An IPv6 enabled server contacted by the device can use the address to track the device across connections. This update implements the IPv6 extension described in RFC 3041 by adding a temporary random address used for outgoing connections.

• Safari

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Visiting a maliciously crafted website may cause MobileSafari to exit on launch

  Description: A maliciously crafted website may contain javascript that repeatedly causes another application on the device to launch via its URL handler. Visiting this website with MobileSafari will cause MobileSafari to exit and the target application to be launched. This sequence would continue each time MobileSafari is opened. This issue is addressed by returning to the previous page when Safari is re-opened after another application was launched via its URL handler.

  CVE-ID

  CVE-2011-0158 : Nitesh Dhanjani of Ernst & Young LLP

• Safari

  Available for: iOS 4.0 through 4.2.1 for iPhone 3GS and later, iOS 4.0 through 4.2.1 for iPod touch (3rd generation) and later, iOS 4.2 through 4.2.1 for iPad

  Impact: Clearing cookies in Safari Settings may have no effect

  Description: In some circumstances, clearing cookies via Safari Settings while Safari is running has no effect. This issue is addressed through improved handling of cookies. This issue does not affect systems prior to iOS 4.0.

  CVE-ID

  CVE-2011-0159 : Erik Wong of Google Inc.

• WebKit

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution

  Description: Multiple memory corruption issues exist in WebKit. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2010-1792

  CVE-2010-1824 : kuzzcc, and wushi of team509 working with TippingPoint's Zero Day Initiative

  CVE-2011-0111 : Sergey Glazunov

  CVE-2011-0112 : Yuzo Fujishima of Google Inc.

  CVE-2011-0113 : Andreas Kling of Nokia

  CVE-2011-0114 : Chris Evans of Google Chrome Security Team

  CVE-2011-0115 : J23 working with TippingPoint's Zero Day Initiative, and Emil A Eklund of Google, Inc.

  CVE-2011-0116 : an anonymous researcher working with TippingPoint's Zero Day Initiative

  CVE-2011-0117 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0118 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0119 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0120 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0121 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0122 : Slawomir Blazek

  CVE-2011-0123 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0124 : Yuzo Fujishima of Google Inc.

  CVE-2011-0125 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0126 : Mihai Parparita of Google, Inc.

  CVE-2011-0127 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0128 : David Bloom

  CVE-2011-0129 : Famlam

  CVE-2011-0130 : Apple

  CVE-2011-0131 : wushi of team509

  CVE-2011-0132 : wushi of team509 working with TippingPoint's Zero Day Initiative

  CVE-2011-0133 : wushi of team509 working with TippingPoint's Zero Day Initiative

  CVE-2011-0134 : Jan Tosovsky

  CVE-2011-0135 : an anonymous reporter

  CVE-2011-0136 : Sergey Glazunov

  CVE-2011-0137 : Sergey Glazunov

  CVE-2011-0138 : kuzzcc

  CVE-2011-0140 : Sergey Glazunov

  CVE-2011-0141 : Chris Rohlf of Matasano Security

  CVE-2011-0142 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0143 : Slawomir Blazek and Sergey Glazunov

  CVE-2011-0144 : Emil A Eklund of Google, Inc.

  CVE-2011-0145 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0146 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0147 : Dirk Schulze

  CVE-2011-0148 : Michal Zalewski of Google, Inc.

  CVE-2011-0149 : wushi of team509 working with TippingPoint's Zero Day Initiative, and SkyLined of Google Chrome Security Team

  CVE-2011-0150 : Michael Gundlach of safariadblock.com

  CVE-2011-0151 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0152 : SkyLined of Google Chrome Security Team

  CVE-2011-0153 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0154 : an anonymous researcher working with TippingPoint's Zero Day Initiative

  CVE-2011-0155 : Aki Helin of OUSPG

  CVE-2011-0156 : Abhishek Arya (Inferno) of Google, Inc.

  CVE-2011-0157 : Benoit Jacob of Mozilla

  CVE-2011-0168 : Sergey Glazunov

• WebKit

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: HTTP Basic Authentication credentials may be inadvertently disclosed to another site

  Description: If a site uses HTTP Basic Authentication and redirects to another site, the authentication credentials may be sent to the other site. This issue is addressed through improved handling of credentials.

  CVE-ID

  CVE-2011-0160 : McIntosh Cooey of Twelve Hundred Group, Harald Hanche-Olsen, Chuck Hohn of 1111 Internet LLC working with CERT, and Paul Hinze of Braintree

• WebKit

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: Visiting a maliciously crafted website may lead to cross-site style declarations

  Description: A cross-origin issue existed in WebKit's handling of the Attr.style accessor. Visiting a maliciously crafted website may allow the site to inject CSS into other documents. This issue is addressed by removing the Attr.style accessor.

  CVE-ID

  CVE-2011-0161 : Apple

• WebKit

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: A maliciously crafted website may be able to prevent other sites from requesting certain resources

  Description: A cache poisoning issue existed in WebKit's handling of cached resources. A maliciously crafted website may be able to prevent other sites from requesting certain resources. This issue is addressed through improved type checking.

  CVE-ID

  CVE-2011-0163 : Apple

• Wi-Fi

  Available for: iOS 3.0 through 4.2.1 for iPhone 3GS and later, iOS 3.1 through 4.2.1 for iPod touch (3rd generation) and later, iOS 3.2 through 4.2.1 for iPad

  Impact: When connected to Wi-Fi, an attacker on the same network may be able to cause a device reset

  Description: A bounds checking issue existed in the handling of Wi-Fi frames. When connected to Wi-Fi, an attacker on the same network may be able to cause a device reset.

  CVE-ID

  CVE-2011-0162 : Scott Boyd of ePlus Technology, inc.