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ABCDKERNELPANIC: Unicode vs. Apple Inc.

Posted August 29, 2013    BeyondTrust Research Team

Yesterday, Russian researchers publicly disclosed the presence of a denial of service vulnerability affecting OS X 10.8 and iOS 6. OS X 10.9 Mavericks and iOS 7 are unaffected. So what’s the big deal with this particular denial of service vulnerability? It’s remotely exploitable and is trivial to trigger. Stringing together a series of Unicode characters, Arabic \u062E\u0337\u0334\u0310\u062E, and making a target display the characters triggers the vulnerability, causing applications to crash immediately.

Malicious Unicode

Malicious Unicode

Third party applications such as Chrome and Twitter (on both iOS and OS X), as well as iOS built-in applications like Messages, crash when displaying the above Unicode. Attackers may even create malicious SSIDs and broadcast them in public places. When a target user goes to join a WiFi network, turn on WiFi, or check their WiFi, the malicious SSID may be rendered by Core Text, a text and font layout and handling mechanism within OS X and iOS. The resulting segmentation fault in Core Text may cause instability in OS X, or even make an iOS device reboot.

Social media services have seen users posting, tweeting, and sharing the malicious Unicode string, prompting Facebook to ban the string from future posts. Having your Twitter feed blow up a Chrome tab isn’t the end of the world, but certainly worth mentioning as curious members of the public and script-kiddies everywhere will be having fun with this until a fix is released.

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Dark Reading

2014: The Year of Privilege Vulnerabilities

Posted December 18, 2014    Chris Burd

Of the 30 critical-rated Microsoft Security Bulletins this year, 24 involved vulnerabilities where the age-old best practice of “least privilege” could limit the impact of malware and raise the bar of difficulty for attackers.

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Looking back on information security in 2014

Posted December 16, 2014    Dave Shackleford

Dave Shackleford is a SANS Instructor and founder of Voodoo Security. Join Dave for a closer look at the year in security, and learn what you can do to prepare for 2015, with this upcoming webinar. 2014 has been one heck of an insane year for information security professionals. To start with, we’ve been forced…

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December 2014 Patch Tuesday

Posted December 9, 2014    BeyondTrust Research Team

This month marks the final Patch Tuesday of 2014. Most of what is being patched this month includes Internet Explorer, Exchange, Office, etc… and continues a trend of the greatest hits collection of commonly attacked Microsoft software. Probably the one thing that broke the mold this month is that for once there is not some…

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