May 5, 2022 6:15:27 AM | Bypassing Doors | how to | Defense Bypassing Doors – Part 2: DDT

Wondering how our pentesters open doors they don’t have access to? The Bypassing Doors blog series will demonstrate easy-to-use tools and techniques that can be utilized to bypass your organization’s interior and exterior doors. In this part 2 post, we will go through a quick overview of the Double Door Tool (DDT).

The DDT is perfect for any exterior crash bar doors that unfortunately have a centerline gap. Without a proper blocking plate or improperly spaced doors, this tool can be very effective in gaining access to a building through double doors.

Double Door Tool – DDT

The images below display the DDT and the type of double doors that it works on, it’s a pretty simple tool that pentesters include in their pentesting toolkit. One would insert the tool between the double doors, then twist the tool to work it against the crash bar handles by maneuvering the tool in different directions. Then apply pressure to push the handle down once the tool is in place – bingo! Access inside is that quick & easy. 

Photo of the Double Door Tool (DDT):

Image from https://www.sparrowslockpicks.com/product_p/ddt.htm
Shows the double door tool (DDT) which is a metal L shaped tool that bypasses doors and used by White Oak Security’s expert pentesters.

Photo of a double, crash bar door the tool could be utilized against:

Photo of a double, crash bar door the DDT could be utilized against, image captured by White Oak Security’s pentesters.

Below is a video of the DDT in action:

Video of DDT in action.

How To Prevent Double Door Bypass

There are multiple prevention options that can be implemented to prevent the Double Door Tool. These options include the following:

Mullion

Install Mullion to prevent the tool from being inserted through space between doors.

Install Mullion to prevent the tool from being inserted through space between doors to prevent White Oak Security’s pentesters from bypassing your double doors.

Lock Plate

This option is not the preferred way of remediation, but it might inconvenience an attacker.

A lock plate can prevent White Oak Security’s pentesters from bypassing your double doors with a DDT.

If you missed part 1 of the bypassing doors series, check out the UTDT post. More physical pentesting tools and overviews are being published soon, so stay tuned for part 3!

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Written By: Brett DeWall