This is a report of a 0-day backdoor giving remote root shell access on Teradek IP video devices. Reported the issue to the manufacturer last year, they have released a new firmware version since then, but have not fixed it. That is why this is full disclosure here. Proof of concept is following below.

About the device

Teradek VidiU Go IP video streaming device

The device has an Ethernet interface and there is a Web management interface accessible at http://<device_ip> by default. The Web management interface is protected by a user-defined password.

Mimikatz integrated in the current Metasploit Framework is a little bit outdated. If you want to use the recent features (like plaintext RDP credential dumping), the Mimikatz Extension (called Kiwi) should be manually updated and compiled into the current framework. Here is how to do it.

The Kiwi Extension

The great Mimikatz post-exploitation tool by Gentilkiwi

I have read tons of articles about how does L3 multicast routing across subnets work, but none of them was complete for my scenario. Here is my solution.

The Scenario

We have to route the SSDP…

The challenge “Baseline test” was a great reverse engineering challenge with hard difficulty at the Hungarian Cyber Security Challenge 2020 CTF Qualifiers hosted by the National Cyber-Security Center of Hungary on the platform Avatao Next.

The challenge

Points: 300
Difficulty: hard

Answer some simple questions.


The baseline test is an examination designed to measure any emotional deviance. In addition to the original test, this one has a second part to challenge rationality. Answer every question to fetch the flag.

Accessing the challenge was provided by SSH (cmdline was included in the challenge description), and in the container there was a SUID…

Installing an unsigned iOS app (what is the prerequisite of jailbreaking) using Linux with (semi-)legitimate tools.

Consider the following situation: we have a factory-installed iOS device (iPhone 5S here) with a recent iOS version (12.4.8) and we want to jailbreak it. We have a Linux desktop (Arch Linux in the following guide), a lightning cable for the iPhone device, but nothing more. For example, we have no genuine Apple hardware installed with macOS.

There are a lot of iOS jailbreaking solutions available for free. Most of them are iOS apps distributed in .ipa file format packages. …

Recently I have lost an important phone number accidentally as a consequence of wiping the data partition of my Android device (due to an OS upgrade migrating from the official but unsupported LineageOS branch to my unofficial but up-to-date supported LineageOS builds). All of the data were backed up, but unfortunately, this one phone number was not, and it was important. So I had to recover it somehow.

Because the wiped data partition was encrypted and the encryption keys were lost, any forensics jobs on the wiped partition would have been extremely hard or almost impossible.

Where else could we…

István Tóth

IT Security Expert, Penetration Testing, Red Teaming | OSCP | CRT(E|O) | @RingZer0_CTF 1st (for 2yrs), RCEH | HackTheBox Top10 | RPISEC MBE | Flare-On completer

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