About the security content of Xcode 6.3

This document describes the security content of Xcode 6.3.

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.

Xcode 6.3

• Clang

  Available for: OS X Yosemite v10.10 or later

  Impact: An attacker may be able to bypass stack guards

  Description: A register allocation issue existed in clang which sometimes led to stack cookie pointers being stored on the stack itself. This issue was addressed with improved register allocation.

• Swift

  Available for: OS X Yosemite v10.10 or later

  Impact: Swift programs performing certain type conversions may receive unexpected values

  Description: A integer overflow issue existed in the simulator that could lead to conversions returning unexpected values. This issue was addressed by using improved checks.

  CVE-ID

  CVE-2015-1149