The Empire Strikes Back Apple – how your Mac firmware security is completely broken

If you are a rootkits fan the latest Chaos Communication Congress (CCC) in 2014 brought us two excellent presentations, Thunderstrike by Trammell Hudson and Attacks on UEFI security, inspired by Darth Venami’s misery and Speed Racer by Rafal Wojtczuk and Corey Kallenberg. The first one was related to the possibility to attack EFI from a Thunderbolt device, and the second had a very interesting vulnerability regarding the (U)EFI boot script table. [Read More]

How to fix rootpipe in Mavericks and call Apple’s bullshit bluff about rootpipe fixes

The rootpipe vulnerability was finally fully disclosed last week after a couple of months of expectation since its first announcement. It was disclosed as a hidden backdoor but it’s really something more related to access control and crap design than a backdoor. Although keep in mind that good backdoors should be hard to distinguish from simple errors. In this case there are a lot of services using this feature so it’s hardly a hidden backdoor that just sits there waiting for some evil purpose. [Read More]

How to bypass Google’s Santa LOCKDOWN mode

Santa is a binary whitelisting/blacklisting system made by Google Macintosh Operations Team. While I refer to it as Google’s Santa it is not an official Google product. It is based on a kernel extension and userland components to control the execution of binaries in OS X systems. It features two interesting modes of execution, monitor and lockdown. The monitor mode is a blacklisting system, where all binaries except those blacklisted can run. [Read More]

BadXNU, a rotten apple! – CodeBlue 2014, SyScan 2015 slides and source code

The last SyScan is almost here so it’s time to get again into a plane and travel to Singapore. This means that the slides and source code can finally be released. Below you can find the archive with both presentations slides (they are slightly different, SyScan version fixes/upgrades a few things) and full source code for both rootkit/kext loaders. I hope you enjoy them; they are quite fun techniques, in particular the second one which now I sort of regret to disclose because it’s so cool. [Read More]

https is now (finally) supported!

Hummm this is something that I should have done a long time ago but was always too lazy since there’s not highly critical information here (except some hashes and my PGP key/id). Anyway, you can finally access the blog over https://reverse.put.as. I still need to understand if there’s any impact on Google search stuff by moving it to HTTPS only. Better late then never. Oh and fuck you David Cameron and your stupid populist ideas. [Read More]

Happy New Year!

A few days late but, Happy New Year! 2014 is gone and it was an interesting year. Learnt quite a few new things in different areas, created tons of code, and got a couple of very interesting ideas to explore in 2015. It also ended in a great way with a visit to CodeBlue to present BadXNU, a rotten apple. If there’s city and country I always wanted to visit, those were Tokyo and Japan. [Read More]

Patching what Apple doesn’t want to or how to make your “old” OS X versions a bit safer

Today a local privilege escalation vulnerability was disclosed in this blog post. It describes a vulnerability in IOBluetoothFamily kernel extension (IOKit is a never-ending hole of security vulnerabilities). Mavericks and most probably all previous versions are vulnerable but not Yosemite. The reason for this is that Apple silently patched the bug in Yosemite. This is not a new practice, where Apple patches bugs in the latest and newly released OS X version and doesn’t care about older versions. [Read More]

Can I SUID: a TrustedBSD policy module to control suid binaries execution

Let me present you another TrustedBSD policy module, this time to control execution of suid enabled binaries. The idea to create this started with nemo’s exploitation of bash’s shellshock bug and VMware Fusion. It was an easy local privilege escalation because there are many Fusion suid enabled binaries. This got me thinking that I want to know when this kind of binaries are executed and if possible control access to them. [Read More]

The double free mach port bug: The short story of a dead 0day

The iOS 8 security update bulletin has many fixed bugs, one of which is this one: A double free issue existed in the handling of Mach ports. This issue was addressed through improved validation of Mach ports. CVE-2014-4375 : an anonymous researcher. Well, I’ve known this bug for a while and it was insanely fun as anti-debugging measure because of its random effects when triggered. For example, sometimes you get an immediate kernel panic, others nothing happens, and most of the time you get weird CPU spikes not attributed to any process, or system lock ups after a while. [Read More]

Shakacon #6 presentation: Fuck you Hacking Team, From Portugal with Love.

Aloha, Shakacon number 6 is over, it was a blast and I must confess it beat my expectations. Congratulations to everyone involved in making it possible. Definitely recommended if you want to speak or attend, and totally worth the massive jet lag. My presentation was about reverse engineering Hacking Team OS X malware latest known sample. The slide count is 206 and I was obviously not able to present everything. The goal is that you have a nice reference available for this malware and also MPRESS unpacking (technically dumping). [Read More]