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XCCDF
Guide to the Secure Configuration of Ubuntu 16.04
System Settings
File Permissions and Masks
Verify Permissions on Important Files and Directories
Verify that All World-Writable Directories Have Sticky Bits Set
Verify that All World-Writable Directories Have Sticky Bits Set
An XCCDF Rule
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Verify that All World-Writable Directories Have Sticky Bits Set
Medium Severity
When the so-called 'sticky bit' is set on a directory, only the owner of a given file may remove that file from the directory. Without the sticky bit, any user with write access to a directory may remove any file in the directory. Setting the sticky bit prevents users from removing each other's files. In cases where there is no reason for a directory to be world-writable, a better solution is to remove that permission rather than to set the sticky bit. However, if a directory is used by a particular application, consult that application's documentation instead of blindly changing modes.
To set the sticky bit on a world-writable directory
DIR
, run the following command:
$ sudo chmod +t
DIR