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Why do we need file permissions?
File permissions specify who and what can read, write, modify, and access them. This is important, as the Codex explains, because WordPress may need access to write to files in your wp-content directory to enable certain functions.
What is the use of SUID?
SUID is a special file permission for executable files which enables other users to run the file with effective permissions of the file owner.
What are the special permissions?
Three special types of permissions are available for executable files and public directories. When these permissions are set, any user who runs that executable file assumes the user ID of the owner (or group) of the executable file.
What are the special permissions for suid in Linux?
This command, by default, has the SUID permission set: Note the s where x would usually indicate execute permissions for the user. Commonly noted as SGID, this special permission has a couple of functions: If set on a file, it allows the file to be executed as the group that owns the file (similar to SUID)
What are the special permissions for Suid and SGID?
Any member of the group can access any new file. This applies to the execution of files, as well. SGID is very powerful when utilized properly. As noted previously for SUID, if the owning group does not have execute permissions, then an uppercase S is used. The last special permission has been dubbed the “sticky bit.”
Why does / bin / Su permission with Suid?
Many of them need to be setuid for them to operate properly. “su” is one. X windows servers tend to be another. “passwd” also needs to be setuid or users won’t be able to set their own passwords. Don’t tell me that audit report says to remove the setuid bit from “passwd”…
When does Suid run using another user’s privileges?
When a user runs a program, given they have the correct reading/executing rights, it will run using their account privileges. SUID allows a user to run a program using another users privileges. To further understand file privileges, complete challenge 4 in the Christmas room or read the supporting material here.