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
161 months ago
PRISM fix - nice! Waiting for Snowden Lion now.
Score: 14 Votes (Like | Disagree)
dempson Avatar
161 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
161 months ago
Thanks apple for keeping SL on track! :-)
Score: 6 Votes (Like | Disagree)
Cubert Avatar
161 months ago
I wonder how much longer Snow Leopard support will continue after Mavericks is released?
Score: 5 Votes (Like | Disagree)
joelvega125 Avatar
161 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
161 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

m1 chip slide

Five Years of Apple Silicon: M1 to M5 Performance Comparison

Monday November 10, 2025 1:08 pm PST by
Today marks the fifth anniversary of the Apple silicon chip that replaced Intel chips in Apple's Mac lineup. The first Apple silicon chip, the M1, was unveiled on November 10, 2020. The M1 debuted in the MacBook Air, Mac mini, and 13-inch MacBook Pro. The M1 chip was impressive when it launched, featuring the "world's fastest CPU core" and industry-leading performance per watt, and it's only ...
iOS 26

iOS 26.2 Available Next Month With These 8 New Features

Tuesday November 11, 2025 9:48 am PST by
Apple released the first iOS 26.2 beta last week. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date....
All Screen iPhone 2027 Feature 1

Apple to Hide Selfie Camera Under Display of 20th Anniversary iPhone

Monday November 10, 2025 1:55 am PST by
Apple will conceal the front-facing camera under the screen of its 2027 iPhone, a Chinese leaker said today, corroborating reports that Apple's 20th anniversary iPhone will have no visible cutouts in the display. Weibo-based account Digital Chat Station said Apple's development of under-screen camera technology was progressing as planned for adoption in 2027, one year after it will...
iphone pocket%402x

Apple Debuts iPhone Pocket, a Limited Edition iPod Sock-Style Accessory

Tuesday November 11, 2025 1:23 am PST by
Apple has teamed up with Japanese fashion house ISSEY MIYAKE to launch iPhone Pocket, a 3D-knitted limited edition accessory designed to carry an iPhone, AirPods, and other everyday items. The accessory is like a stretchy pocket, not unlike an iPod Sock, but elongated to form a strap made of a ribbed, elastic textile that fully encloses an iPhone yet allows you to glimpse the display...
iphone air thinness

iPhone Air Sales Are So Bad That Apple's Delaying the Next-Generation Version

Monday November 10, 2025 11:41 am PST by
The thin, light iPhone Air sold so poorly that Apple has decided to delay the launch of the next-generation iPhone Air that was scheduled to come out alongside the iPhone 18 Pro, reports The Information. Apple initially planned to release a new iPhone Air in fall 2026, but now that's not going to happen. Since the iPhone Air launched in September, there have been reports of poor sales...
homepod mini colors

New HomePod Mini Coming Soon With These Features

Tuesday November 11, 2025 7:30 am PST by
Apple is expected to announce a new HomePod mini imminently, headlining with new chips. Here are all of the new features we're expecting. The second-generation HomePod mini is highly likely to contain a more up-to-date chip for more advanced computational audio and improved responsiveness. The current HomePod mini is equipped with the Apple Watch Series 5's S5 chip from 2019. Apple is likely ...
ios 26 digital id passport wallet

Apple Announces Launch of U.S. Passport Feature in iPhone's Wallet App

Wednesday November 12, 2025 9:15 am PST by
Apple today announced that iPhone users can now create a Digital ID in the Apple Wallet app based on information from their U.S. passport. To create and present a Digital ID based on a U.S. passport, you need: An iPhone 11 or later running iOS 26.1 or later, or an Apple Watch Series 6 or later running watchOS 26.1 or later Face ID or Touch ID and Bluetooth turned on An Apple Account ...
iphone black friday gold

The Best Early Black Friday iPhone Deals

Monday November 10, 2025 10:18 am PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2025 sales have kicked off at AT&T, Verizon, T-Mobile, and more. Right now we're tracking notable offers on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air. For even more savings, keep an eye on older models during the holiday shopping season. Note: MacRumors is...
Early Black Friday Deals 1

The Best Early Black Friday Apple Deals on AirPods, Apple Watch, iPad, and More

Saturday November 8, 2025 6:16 am PST by
We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...
homepod mini thumb feature

New HomePod Mini, Apple TV, and AirTag Were Expected This Year — Where Are They?

Wednesday November 12, 2025 11:42 am PST by
While it was rumored that Apple planned to release new versions of the HomePod mini, Apple TV, and AirTag this year, it is no longer clear if that will still happen. Back in January, Bloomberg's Mark Gurman said Apple planned to release new HomePod mini and Apple TV models "toward the end of the year," while he at one point expected a new AirTag to launch "around the middle of 2025." Yet,...