Improve the security of Mac OS X.

What's New in OS X Lion v10.7.3 and Security Update 2012-001:

• Address Book
  • Available for: OS X Lion v10.7 to v10.7.2, OS X Lion Server v10.7 to v10.7.2
  • Impact: An attacker in a privileged network position may intercept CardDAV data
  • Description: Address Book supports Secure Sockets Layer (SSL) for accessing CardDAV. A downgrade issue caused Address Book to attempt an unencrypted connection if an encrypted connection failed. An attacker in a privileged network position could abuse this behavior to intercept CardDAV data. This issue is addressed by not downgrading to an unencrypted connection without user approval.
• Apache
  • Available for: Mac OS X v10.6.8, Mac OS X Server v10.6.8, OS X Lion v10.7 to v10.7.2, OS X Lion Server v10.7 to v10.7.2
  • Impact: Multiple vulnerabilities in Apache
  • Description: Apache is updated to version 2.2.21 to address several vulnerabilities, the most serious of which may lead to a denial of service. Further information is available via the Apache web site at http://httpd.apache.org/

For complete release notes please go here.