LDAP null base returns information
|ldap-nullbase (1425)||Low Risk|
If the Lightweight Directory Access Protocol (LDAP) allows a null base in an LDAP search, a user can submit a search that returns information on namingContexts and supported controls. An attacker could use this information to access directory listings and plan further attacks.
A naming context contains meta data about the directory server and the data managed by the server.
This event is an audit check and is not necessarily indicative of a vulnerability.
LDAP implementations are required to return some information as a result of a search. This information is required for LDAP clients to bind and interact with the directory.
When this event occurs, users can dump the base of the tree or issue a request without knowing the base object. LDAP implementations vary on how or whether it is possible or necessary to constrain or prevent null base requests. Some implementations use an access control list (ACL), others provide the ability using a utility program or user interface, and others may not be able to prevent these requests. Contact your vendor or refer to the documentation for more details on hardening specific LDAP implementations.
- Request for Comment document RFC 2251: Lightweight Directory Access Protocol (v3).
- Request for Comment document RFC 2820: Access Control Requirements for LDAP.
- Request for Comment document RFC 2829: Authentication Methods for LDAP.
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