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

The Teradek IP video devices are live streaming devices able to encode video inputs (like SDI, HDMI, etc) to various streaming formats capable of Ethernet transport. There are different IP video devices made by Teradek, but the firmwares seems to be very similar (especially in the backdoor functionality). …

Mimikatz integrated in the current Metasploit Framework is a little bit outdated.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 (in)famous Meterpreter shell…

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

I have two sites connected by (L3-routed) WireGuard VPN. If we want to browse a DLNA server (e.g. a NAS serving media…

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…

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…

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…

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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