Thaw door deadlock7/14/2023 ![]() However, that feature is a security weakness. The purpose for the angle is to enable the latch bolt to be pushed in automatically as the door is closed, otherwise you’d have to manually twist the doorknob to retract the latch and be able to close the door. ![]() IT departments take note: this vulnerability is common for IT equipment room closets, especially where the closet originally served another purpose, and was later given to IT without upgrading the door to a security grade installation.įor convenience in closing doors, many types of door latch bolt have a beveled tip shape as shown in Figure 1. Recently at one facility, after a big name company installed card + PIN electronic access control (card reader plus keypad) for a half-dozen very critical internal doors, I was able to slip my comb out of my pocket and pop open each door. ![]() Facility managers have been amazed to see strong commercial and industrial locks bypassed this way. Over the past 15 years, when I started tracking this particular vulnerability in our facility security assessments, in every commercial facility security assessment I performed, I found that at least one door could be easily opened (5 seconds or less) with a credit card, screwdriver or hair comb. It is the purpose of this part of the door lock mechanism to prevent doors from being opened in this fashion. How could this be?Ī: Most likely, the door latch installation somehow kept the deadlocking plunger (also called a deadlock latch) from being engaged, or allowed it to be disengaged. Q: We installed a good quality industrial door lock, yet someone was able to bypass it using a credit card. ![]() One recent facility security assessment started with the question below, and after encountering this vulnerability in every assessment for the past 15 years, it became obvious that it was time to write about it. ![]()
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