- LITTLE SNITCH FOR MAC YOSEMITE 3.6.4 HOW TO
- LITTLE SNITCH FOR MAC YOSEMITE 3.6.4 MAC OS X
- LITTLE SNITCH FOR MAC YOSEMITE 3.6.4 INSTALL
arg1 (of type (int *)) is a pointer to an an errno-style error code if the listener denies the request, it must set this value to a non-zero value.” arg0 (of type proc_t) is the process being traced. “ KAUTH_PROCESS_CANTRACE - Authorizes whether the current process can trace the target process. The documentation discusses the following action available in the process scope: The Kernel Authorization subsystem ( kauth) supports the installation of a listener (process scope) to control which processes can trace or debug other processes. This information is still accurate today but let’s revisit it for a moment since they have a new trick inside their kernel extension.
One of my very first blog posts was about Little Snitch’s anti-debugging measures. The code is old but it is still the best reference to date. If you are interested in playing with them you should start with tcplognke source code because it implements packet reinjection. Socket filters are an interesting and powerful OS X feature.
LITTLE SNITCH FOR MAC YOSEMITE 3.6.4 HOW TO
There I show you how to locate and dump the kernel structures associated with socket filters and how to attack/bypass them from a kernel rootkit perspective.
LITTLE SNITCH FOR MAC YOSEMITE 3.6.4 MAC OS X
You can find additional information about socket filters in my Revisiting Mac OS X Kernel Rootkits Phrack article, section 6.4. The following diagram from this document describes its implementation in the networking stack: A complete description and implementation guide to socket filters is in Apple’s Network Kernel Extensions Programming Guide. The OS X feature that makes Little Snitch possible is called socket filters.
LITTLE SNITCH FOR MAC YOSEMITE 3.6.4 INSTALL
It is widely popular: I personally make sure it’s the first thing I install when configuring new OS X images. It is a super-useful addition to OS X because you directly observe and control the network traffic on your Mac, expected and unexpected. Little Snitch is an application firewall able to detect applications that try to connect to the Internet or other networks, and then prompt the user to decide if they want to allow or block those connection attempts. You are reading this because the answer is yes! What is Little Snitch?
Are there any more interesting security issues remaining in version 3.6.3 (current at the time of research) for us to find? Hopefully Little Snitch’s developers will revise this policy and be more clear about the vulnerabilities they address, so users can better understand their threat posture. Little Snitch version 3.6.2, released in January 2016, fixes a kernel heap overflow vulnerability despite not being mentioned in the release notes – just a “ Fixed a rare issue that could cause a kernel panic”. The upcoming DEF CON presentation on Little Snitch re-sparked my curiosity last week and it was finally time to give the firewall a closer look. In the past I reported some weaknesses related to their licensing scheme but I never audited their kernel code since I am not a fan of IOKit reversing. Little Snitch was among the first software packages I tried to reverse and crack when I started using Macs.