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Oh this one has been into my head for so long that I finally decided to try and create the code for it. So let’s go! What’s the background story? In August 2011 I reported to Apple a security issue with iTunes. What happens is that iTunes plugins are loaded into iTunes process space so they have full control of iTunes. Evil plugins can do all kinds of things such as stealing iTunes passwords and credit card information, or patching some annoying features as I did with Disable m3u plugin....

New version available at the github repo, compatible with Mavericks and with a Cocoa app to control its features. Mavericks sysent table is modified so previous versions weren’t compatible with it. I updated the sysent table definitions. It’s not the best method to assure future compatibility in case Apple decides to change the structure again. A better way is to find the symbols for the syscalls and replace them directly in the sysent table....

Disclaimer: This malware sample is not in any way related to Hacking Team (as far as I know) other than me making some jokes about them related to a future presentation about their OS X malware product. Two months ago (maybe three) I started noticing a sporadic redirect when I accessed these blog pages. It wasn’t anything “malicious” as far as I could evaluate; just a redirect to adult friend finder site....

For some reason Apple wants to change external kernel extensions location from /System/Library/Extensions to /Library/Extensions and introduced in Mavericks a code signing requirement for all extensions and/or drivers located in that folder. Extensions will not be loaded if not signed (those located in the “old” folder and not signed will only generate a warning [check my SyScan360 slides]). The signing certificates require a special configuration and to obtain them you need to justify it....

One thing that really bothered me for a long time while debugging is the need to calculate the libraries loaded addresses versus the addresses at disk if you want to follow and comment library code in IDA. While the ASLR slide can also be disabled when starting processes (or even attaching by disabling it first in the Mach-O header) sometimes I want to attach to ASLR enabled processes and once again I need to compute values without the slide to follow in IDA....