About the security content of iOS 4.2.7 Software Update for iPhone

This document describes the security content of iOS 4.2.7 Software Update.

This document describes the security content of iOS 4.2.7 Software Update, 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 4.2.7 Software Update for iPhone

• Certificate Trust Policy

  Available for: iOS 4.2.5 through 4.2.6 for iPhone 4 (CDMA)

  Impact: An attacker with a privileged network position may intercept user credentials or other sensitive information

  Description: Several fraudulent SSL certificates were issued by a Comodo affiliate registration authority. This may allow a man-in-the-middle attacker to redirect connections and intercept user credentials or other sensitive information. This issue is addressed by blacklisting the fraudulent certificates.

  Note: For Mac OS X systems, this issue is addressed with Security Update 2011-002. For Windows systems, Safari relies on the certificate store of the host operating system to determine if an SSL server certificate is trustworthy. Applying the update described in Microsoft Knowledge Base Article 2524375 will cause Safari to regard these certificates as untrusted. The article is available at http://support.microsoft.com/kb/2524375

• QuickLook

  Available for: iOS 4.2.5 through 4.2.6 for iPhone 4 (CDMA)

  Impact: Viewing a maliciously crafted Microsoft Office file may lead to an unexpected application termination or arbitrary code execution

  Description: A memory corruption issues existed in QuickLook's handling of Microsoft Office files. Viewing a maliciously crafted Microsoft Office file may lead to an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2011-1417 : Charlie Miller and Dion Blazakis working with TippingPoint's Zero Day Initiative

• WebKit

  Available for: iOS 4.2.5 through 4.2.6 for iPhone 4 (CDMA)

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

  Description: An integer overflow issue existed in the handling of nodesets. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2011-1290 : Vincenzo Iozzo, Willem Pinckaers, Ralf-Philipp Weinmann, and an anonymous researcher working with TippingPoint's Zero Day Initiative

• WebKit

  Available for: iOS 4.2.5 through 4.2.6 for iPhone 4 (CDMA)

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

  Description: A use after free issue existed in the handling of text nodes. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution.

  CVE-ID

  CVE-2011-1344 : Vupen Security working with TippingPoint's Zero Day Initiative, and Martin Barbella