Linked by Thom Holwerda on Thu 5th Mar 2009 23:02 UTC
With the infamous PWN2OWN contest drawing ever closer, the heat is ramping up. This year's instalment pitches Apple's Safari (on the Mac), Google's Chrome, Internet Explorer 8, and Firefox (all on Windows 7) against one another, while also allowing crackers to take on mobile platforms. Last year's winner, Charlie Miller, who won by cracking Mac OS X within minutes last year, says Safari on the Mac will be the first to fall.
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RE[5]: Address Space Randomization
by erikharmon on Fri 6th Mar 2009 23:18
in reply to "RE[4]: Address Space Randomization"
Member since:2007-06-20
And, also, while many library offsets are randomized, the heap and stack appear not to be (http://www.matasano.com/log/986/what-weve-since-learned-about-leopa...).
I didn't think this was so bad at first because Wikipedia indicates that OS X supports the NX bit, but it appears they only do so on the stack and not the heap.
News
Linked by Thom Holwerda on 05/25/13 0:45 UTC
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Linked by Thom Holwerda on 05/24/13 23:59 UTC
The Tizen Greek Community has some screenshots of a very recent build of Tizen running on a Samsung GT-i8800. It looks wholly unremarkable.
Linked by Thom Holwerda on 05/24/13 22:33 UTC
Joint statement to The Next Web from Microsoft and Google: "Microsoft and YouTube are working together to update the new YouTube for Windows Phone app to enable compliance with YouTube's API terms of service, including enabling ads, in the coming weeks. Microsoft will replace the existing YouTube app in Windows Phone Store with the previous version during this time." Good to know these children stopped acting like little pricks. Can we have full Google support in Windows 8 now, please?
Linked by Howard Fosdick on 05/24/13 21:41 UTC
Yahoo is acquiring Tumblr, the microblogging and social networking website, for $1.1 billion USD. Tumblr offers little revenue but lots of eyeballs if Yahoo can monetarize them. Now Yahoo is bidding for Hulu, the streaming video service. After years of ineffective responses while Google, Facebook, and others took large chunks of the online advertising market, Yahoo is fighting back. Can Yahoo reignite the momentum it had at the turn of the century? What do you think?
Linked by Thom Holwerda on 05/24/13 14:44 UTC
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Linked by Thom Holwerda on 05/23/13 23:22 UTC
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Linked by Thom Holwerda on 05/23/13 22:04 UTC
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Linked by Thom Holwerda on 05/23/13 22:01 UTC
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Linked by Thom Holwerda on 05/23/13 17:52 UTC
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Linked by Thom Holwerda on 05/22/13 22:23 UTC
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2009-02-15
Hi Vai777,
I understand your frustration, but I won't admit to being guilty to all of your charges. When I first read the article I remembered having read some time ago that some version of Darwin introduced address space randomization. I checked Wikipedia's version history to find when that was and posted the link.
And I wasn't completely wrong. Here is from Apple about this feature in Mac OS X 10.5 (http://www.apple.com/macosx/features/300.html#security):
One of the most common security breaches occurs when a hacker’s code calls a known memory address to have a system function execute malicious code. Leopard frustrates this plan by relocating system libraries to one of several thousand possible randomly assigned addresses.
However, the Wikipedia article on ASLR, which is linked from the article I linked to and I should have read, points out that the Leopard implementation is incomplete. This was discovered by a third party; specifically (http://www.matasano.com/log/981/a-roundup-of-leopard-security-featu...):
The dynamic linker library (dyld) is not randomized. From what I can tell, ten different Leopard macs booted at ten different times will have the same offset to dyld.
And, also, while many library offsets are randomized, the heap and stack appear not to be (http://www.matasano.com/log/986/what-weve-since-learned-about-leopa...).