Apple has released a security update for OS X Snow Leopard, Lion and Mountain Lion, Security Update 2013-003 for Snow Leopard, Lion and Mountain Lion. Apple's security update Knowledge Base article has not been updated with details about the release, but changes should appear soon.

Updates

About Security Update 2013-003 (Lion)

Security Update 2013-003 is recommended for all users and improves the security of OS X.

For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222

The update is available through the Mac App Store and Apple's software download website for Snow Leopard, Lion and Mountain Lion.

Top Rated Comments

lars666 Avatar
164 months ago
PRISM fix - nice! Waiting for Snowden Lion now.
Score: 14 Votes (Like | Disagree)
dempson Avatar
164 months ago
QuickTime fixes

The details have arrived via Apple's security-announce mailing list.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

APPLE-SA-2013-07-02-1 Security Update 2013-003

Security Update 2013-003 is now available and addresses the
following:

QuickTime
Available for: Mac OS X 10.6.8, Mac OS X Server 10.6.8,
OS X Lion v10.7.5, OS X Lion Server v10.7.5,
OS X Mountain Lion v10.8.4
Impact: Playing a maliciously crafted movie file may lead to an
unexpected application termination or arbitrary code execution
Description: A buffer overflow existed in the handling of Sorenson
encoded movie files. This issue was addressed through improved bounds
checking.
CVE-ID
CVE-2013-1019 : Tom Gallagher (Microsoft) & Paul Bates (Microsoft)
working with HP's Zero Day Initiative

QuickTime
Available for: Mac OS X 10.6.8, Mac OS X Server 10.6.8,
OS X Lion v10.7.5, OS X Lion Server v10.7.5,
OS X Mountain Lion v10.8.4
Impact: Playing a maliciously crafted movie file may lead to an
unexpected application termination or arbitrary code execution
Description: A buffer overflow existed in the handling of H.264
encoded movie files. This issue was addressed through improved bounds
checking.
CVE-ID
CVE-2013-1018 : G. Geshev working with HP's Zero Day Initiative

QuickTime
Available for: Mac OS X 10.6.8, Mac OS X Server 10.6.8,
OS X Lion v10.7.5, OS X Lion Server v10.7.5,
OS X Mountain Lion v10.8.4
Impact: Viewing a maliciously crafted movie file may lead to an
unexpected application termination or arbitrary code execution
Description: A buffer underflow existed in the handling of 'mvhd'
atoms. This issue was addressed through improved bounds checking.
CVE-ID
CVE-2013-1022 : Andrea Micalizzi aka rgod working with HP's Zero Day
Initiative

Security Update 2013-003 may be obtained from the Software Update
pane in System Preferences, or Apple's Software Downloads web site:
http://www.apple.com/support/downloads/

The Software Update utility will present the update that applies
to your system configuration.

For OS X Mountain Lion v10.8.4
The download file is named: SecUpd2013-003.dmg
Its SHA-1 digest is: 5452c463819106ec30e9f365031f65f1b6c538c0

For OS X Lion v10.7.5
The download file is named: SecUpd2013-003.dmg
Its SHA-1 digest is: c94eeaee2e329f75830140598c8973b6a8e1b22d

For OS X Lion Server v10.7.5
The download file is named: SecUpdSrvr2013-003.dmg
Its SHA-1 digest is: 849d5d4fd5c5a46f84d3607a84b6957fe4f10a00

For Mac OS X v10.6.8
The download file is named: SecUpd2013-003.dmg
Its SHA-1 digest is: 59f7be08ba2f3e343539c011793f7e31773f9caa

For Mac OS X Server v10.6.8
The download file is named: SecUpdSrvr2013-003.dmg
Its SHA-1 digest is: 7586022106c870e46139016ddc5e667def454430

Information will also be posted to the Apple Security Updates
web site: http://support.apple.com/kb/HT1222

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/

-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
Comment: GPGTools - http://gpgtools.org
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=0jKe
-----END PGP SIGNATURE-----

----------

Hmm, 20mb for 10.8, and a hefty 347mb for 10.6

That's the normal pattern. When Apple releases a security update it usually incorporates earlier security updates going back to the last minor system version number update (which incorporated all security updates prior to that point), so that people installing the system from scratch only need to apply a single system version update followed by a single security update, instead of multiple security updates.

This means that security updates are generally larger for older major system versions, because they have had a longer time since the last minor version number update, and more security updates have accumulated.

Snow Leopard has been accumulating security updates since 10.6.8 was released in June 2011.

Lion has been accumulating security updates since 10.7.5 was released in September 2012.

Mountain Lion's security update only needs to include this batch of fixes, since all earlier ones are included in 10.8.4, which was released in June 2013.
Score: 7 Votes (Like | Disagree)
macnisse Avatar
164 months ago
Thanks apple for keeping SL on track! :-)
Score: 6 Votes (Like | Disagree)
Cubert Avatar
164 months ago
I wonder how much longer Snow Leopard support will continue after Mavericks is released?
Score: 5 Votes (Like | Disagree)
joelvega125 Avatar
164 months ago
Nothing for Snow Leopard? What does it fix exactly?

Did you actually read anything or did you jump straight to comment? Jack wagon...
Score: 5 Votes (Like | Disagree)
macs4nw Avatar
164 months ago
So glad for this. I won't abandon SL for the desktop, as long as APPLE keeps those security updates cummin'.....:)
Score: 4 Votes (Like | Disagree)

Popular Stories

Aston Martin CarPlay Ultra Screen

Apple's CarPlay Ultra to Expand to These Vehicle Brands Later This Year

Sunday February 1, 2026 10:08 am PST by
Last year, Apple launched CarPlay Ultra, the long-awaited next-generation version of its CarPlay software system for vehicles. Nearly nine months later, CarPlay Ultra is still limited to Aston Martin's latest luxury vehicles, but that should change fairly soon. In May 2025, Apple said many other vehicle brands planned to offer CarPlay Ultra, including Hyundai, Kia, and Genesis. In his Powe...
Apple Logo Black

Apple's Next Launch is 'Imminent'

Sunday February 1, 2026 12:31 pm PST by
The calendar has turned to February, and a new report indicates that Apple's next product launch is "imminent," in the form of new MacBook Pro models. "All signs point to an imminent launch of next-generation MacBook Pros that retain the current form factor but deliver faster chips," Bloomberg's Mark Gurman said on Sunday. "I'm told the new models — code-named J714 and J716 — are slated...
iOS 26

iOS 26.3 and iOS 26.4 Will Add These New Features to Your iPhone

Tuesday February 3, 2026 7:47 am PST by
We are still waiting for the iOS 26.3 Release Candidate to come out, so the first iOS 26.4 beta is likely still at least a week or two away. Following beta testing, iOS 26.4 will likely be released to the general public in March or April. Below, we have recapped known or rumored iOS 26.3 and iOS 26.4 features so far. iOS 26.3 iPhone to Android Transfer Tool iOS 26.3 makes it easier...
Apple MacBook Pro M4 hero

New MacBook Pros Reportedly Launching Alongside macOS 26.3

Sunday February 1, 2026 5:42 am PST by
Apple is planning to launch new MacBook Pro models with M5 Pro and M5 Max chips alongside macOS 26.3, according to Bloomberg's Mark Gurman. "Apple's faster MacBook Pros are planned for the macOS 26.3 release cycle," wrote Gurman, in his Power On newsletter today. "I'm told the new models — code-named J714 and J716 — are slated for the macOS 26.3 software cycle, which runs from...
iOS 26 Home Feature

Apple Gives Final Warning to Home App Users

Tuesday February 3, 2026 8:55 am PST by
In 2022, Apple introduced a new Apple Home architecture that is "more reliable and efficient," and the deadline to upgrade and avoid issues is fast approaching. In an email this week, Apple gave customers a final reminder to upgrade their Home app by February 10, 2026. Apple says users who do not upgrade may experience issues with accessories and automations, or lose access to their smart...