Cybersecurity News

No one should beat your security team on the homefield! For several years I have been using the term Homefield Advantage in the context of running a security program, especially in regards to certain aspects of red teaming. Homefield Advantage describes well what a mature security program has to realize and leverage. Wikipedia describes “home advantage” in team sports and highlights some of the benefits: “This benefit has been attributed to psychological effects supporting fans have on the competitors or referees; to psychological or physiological advantages of playing near home in familiar situations; to the disadvantages away teams suffer from changing time zones or climates, or from the rigors of travel; and, in some sports, to specific rules that favor the home team directly or indirectly.” (Wikipedia, 2019)

Today I finalized moving the blog and publishing to Hugo. It was pretty straight forward and I decided to move things into a master branch on github, and publish via the docs/ folder features of Github pages.

One thing every red team should attempt early on and regularly is to perform some password spray testing across their organization to identify and help remediate usage of weak passwords. In the past I have done this on Windows a lot, but now I built a simple version for it for Bash to run it also from a Mac. Check it out: Bash Spray Ideally, a script like bashspray.sh is integrated into your response pipelines, and SOC, Blue Team as well as account owner get notified - so they change their password right away, and any SOC investigation can be performed if necessary.

Interacting with Active Directory on the Mac Did you ever have to interact with Active Directory on a MAC? If yes, this post might be interesting for you. I am pretty new to the Mac and basic things I know how to do on Windows need some research to figure out. This time around I explore Active Directory/LDAP Server interactions. First, there is the Directory Utility on MacOS which can be quite useful. Second, there is Apache’s - Directory Studio - which is pretty amazing and feature rich. Third, you might want to write your own tools or scripts. There are ldap commands that allow you to do most tasks in automated fashion.

The Google Login Flow leaks additional email account information to unauthenticated users. I discovered this in the Google Account Login flow while building KoiPhish. Responsible Disclosure I reported this issue to Google and they looked into it and after a about 5 weeks of back and forth they decided that this is not an issue worth fixing. After asking if I can post about it publicly I got Google’s okay.

The idea for Lyrebird came from observing that sometimes when someone forgets lock their workstation, someone else might mess with their computer. Since I wanted to learn more on how to program a webcam and take pictures - I figured why not create a little tool that takes a screenshot and uses the webcam to take pictures of anyone that interacts with the computer while I’m gone. The way this work is simple, start Lyrebird. It will take a screenshot of the current desktop and then enter its observation mode.

KoiPhish is a simple yet beautiful relay proxy idea. The idea for this little project goes back many years. Since I started learning Golang I figured it would be good exercise to finally go ahead an implement it. So, last December during the 35C3 (which is always inspiring congress) I wrote it up. It relays requests a client makes to the KoiPish to the actual target and responses are sent back to the client. On the way in and out common links are overwritten in order to not break the user experience and functionality.

Just a list of useful notes when dealing with Macs. I’m pretty new to Macs and there might be other, better solutions to the challenges I had to sovle but these worked for me and I’m learning. :) Pivoting between accounts and keychain issues After pivoting on a target host and elevating to root it seems not possible to gain access to other keychains easily. It requires to know the password of the other account still. Just running

Web Applications and Services use cookies to authenticate sessions and users. An adversary can pivot from a compromised host to Web Applications and Internet Services by stealing authentication cookies from browsers and related processes. At the same time this technique bypasses most multi-factor authentication protocols. The reason for this is that the final authentication token that the attacker steals is issued after all factors have been validated. Many users persist cookies that are valid for an extended period of time, even if the web application is not actively used. Cookies can be found on disk and also in process memory. Additionally other applications on the targets machine might store sensitive authentication tokens in memory (e.g. apps which authenticate to cloud services). This pivoting technique can be extended to bearer tokens, JWT and the likes. Pass the Cookie is a post-exploitation technique to perform session hijacking.