Name Directory Indexing
Summary An adversary crafts a request to a target that results in the target listing/indexing the content of a directory as output. One common method of triggering directory contents as output is to construct a request containing a path that terminates in a directory name rather than a file name since many applications are configured to provide a list of the directory's contents when such a request is received. An adversary can use this to explore the directory tree on a target as well as learn the names of files. This can often end up revealing test files, backup files, temporary files, hidden files, configuration files, user accounts, script contents, as well as naming conventions, all of which can be used by an attacker to mount additional attacks.
Prerequisites The target must be misconfigured to return a list of a directory's content when it receives a request that ends in a directory name rather than a file name. The adversary must be able to control the path that is requested of the target. The administrator must have failed to properly configure an ACL or has associated an overly permissive ACL with a particular directory. The server version or patch level must not inherently prevent known directory listing attacks from working.
Solutions 1. Using blank index.html: putting blank index.html simply prevent directory listings from displaying to site visitors. 2. Preventing with .htaccess in Apache web server: In .htaccess, write "Options-indexes". 3. Suppressing error messages: using error 403 "Forbidden" message exactly like error 404 "Not Found" message.
Related Weaknesses
CWE ID Description
CWE-276 Incorrect Default Permissions
CWE-285 Improper Authorization
CWE-288 Authentication Bypass Using an Alternate Path or Channel
CWE-424 Improper Protection of Alternate Path
CWE-425 Direct Request ('Forced Browsing')
CWE-693 Protection Mechanism Failure
CWE-721 OWASP Top Ten 2007 Category A10 - Failure to Restrict URL Access
CWE-732 Incorrect Permission Assignment for Critical Resource
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