iOS 4.3.5 Security Release Resolves 'Certificate Validation' Issues

Apple just released iOS 4.3.5 for the iPhone, iPad and iPod touch in just over a week, after the iOS 4.3.4 release. While the last update addressed a vulnerability to maliciously crafted PDF files, this update fixes a security issue with certificate validation.According to Apple's support bulletin, this vulnerability is a certificate chain validation issue […]

Apple just released iOS 4.3.5 for the iPhone, iPad and iPod touch in just over a week, after the iOS 4.3.4 release. While the last update addressed a vulnerability to maliciously crafted PDF files, this update fixes a security issue with certificate validation.

According to Apple's support bulletin, this vulnerability is a certificate chain validation issue in the handling of X.509 certificates. Someone with an appropriate x.509 certificate could "capture or modify data" in sessions protected by SSL/TLS on iOS devices. Apple said other attacks involving X.509 certificate validation could also be possible through this vulnerability.

The patch can be applied to GSM iPhone 3GS, iPhone 4 and third generation or later iPod touches running iOS 3.1 through 4.3.4, and iPads running iOS 3.2 through 4.3.4.

iOS Firmware

devicecurrent versiondate found
AppleTV(2G) (AppleTV2,1)4.2.2 (8F305)05/11/2011 16:06:01
iPad (iPad1,1)4.3.5 (8L1)07/25/2011 13:31:01
iPad2,1 (iPad2,1)4.3.5 (8L1)07/25/2011 13:31:01
iPad2,2 (iPad2,2)4.3.5 (8L1)07/25/2011 13:31:01
iPad2,3 (iPad2,3)4.3.5 (8L1)07/25/2011 13:31:01
iPhone (iPhone1,1)3.1.3 (7E18)04/08/2010 21:05:48
iPhone3G (iPhone1,2)4.2 (8C148)11/22/2010 13:08:57
iPhone3GS (iPhone2,1)4.3.5 (8L1)07/25/2011 13:31:01
iPhone4 (iPhone3,1)4.3.5 (8L1)07/25/2011 13:31:01
iPhone4(vz) (iPhone3,3)4.2.10 (8E600)07/25/2011 13:31:01
iPodTouch(2G) (iPod2,1)4.2 (8C148)11/22/2010 13:08:57
iPodTouch(3G) (iPod3,1)4.3.5 (8L1)07/25/2011 13:31:01
iPodTouch(4G) (iPod4,1)4.3.5 (8L1)07/25/2011 13:31:01
last updated: 07/25/2011 13:38:01 EDT

Per Apple’s KB:

This document describes the security content of iOS 4.3.5, 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“.

Products Affected

iPad, iPod touch (3rd generation), iPhone 4, iPod touch (4th generation), iPhone 3GS, Product Security

iOS 4.3.5 Software Update

  • Data SecurityAvailable for: iOS 3.0 through 4.3.4 for iPhone 3GS and iPhone 4 (GSM), iOS 3.1 through 4.3.4 for iPod touch (3rd generation) and later, iOS 3.2 through 4.3.4 for iPad

    Impact: An attacker with a privileged network position may capture or modify data in sessions protected by SSL/TLS

    Description: A certificate chain validation issue existed in the handling of X.509 certificates. An attacker with a privileged network position may capture or modify data in sessions protected by SSL/TLS. Other attacks involving X.509 certificate validation may also be possible. This issue is addressed through improved validation of X.509 certificate chains.

    CVE-ID

    CVE-2011-0228 : Gregor Kopf of Recurity Labs on behalf of BSI, and Paul Kehrer of Trustwave’s SpiderLabs