Diebold GEMS central tabulators have a flaw that allows locally authenticated users the ability to enter a two digit code in a certain hidden location and cause a second set of votes to be created on the system. This second set of votes can be modified by the local user and then read by the voting system as legitimate votes. GEMS 1.18.18, GEMS 1.18.19, and GEMS 1.18.23 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34233/diebold.Backdoor.txt
Source: https://packetstormsecurity.com/files/34233/diebold.Backdoor.txt.html