register
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more so the user and my oppinion below that would be the kernel. if you can edit the kernel you can do pretty much anything you want and its also less protected than the register.
This is open to debate, but in general, the weakest link always seems to be the user. That is why social engineering attacks like phishing and email scams can be so effective. Getting users educated and then sold on actually following the established procedures is the greatest challenge.
network
personnel
The people in the chairs using the computers. If the end users are not trained properly they can often be tricked into circumventing the best security measures!
The Weakest Link was created in 2000.
Listening is the weakest link in oral communication
The weakest link. Eggheads wasn't broadcast until 2003. The weakest link started in 2000
The weakest link lets the other links down, and falls apart.
Weakest Link - Hong Kong - ended in 2002.
The duration of Weakest Link - Hong Kong - is 3600.0 seconds.
The Weakest Link - 2000 is rated/received certificates of: Australia:PG
Weakest Link - 2002 was released on: USA: January 2002
Weakest Link - Hong Kong - was created on 2001-08-21.
Weakest Link - 2001 was released on: USA: 16 April 2001