A very common configuration fault seen with Web and file transferservers is for all the files supplied by the service to be owned by thesame "user" account that the server executes as.

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This is known as the "same user" vulnerability and it can allow an attacker to manipulate or delete files on the server if they are able to exploit a vulnerability in the server software. It is recommended to configure the server to have separate user accounts for executing and accessing files to minimize the risk of this type of attack.

A Very Common Configuration Fault Seen with Web and File