knock is a server/client set of tools that implements the idea known as port-knocking. Port-knocking is a method of accessing a backdoor to your firewall through a special sequence of port hits. This can be useful for opening up temporary holes in a restrictive firewall for SSH access or similar.
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Citadel/UX Security Advisory 2004-01 - Citadel/UX versions 5.00 through 6.14 had loose permission settings for database related files, allowing any local shell user to gain access to any data on the system.
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