Detections
Analytics

SQL6-D0-002100 - SQL Server must check the validity of all data inputs except those specifically identified by the organization.

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This audit has been deprecated and will be removed in a future update.

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Information

Invalid user input occurs when a user inserts data or characters into an application's data entry fields and the application is unprepared to process that data. This results in unanticipated application behavior, potentially leading to an application or information system compromise. Invalid user input is one of the primary methods employed when attempting to compromise an application.

With respect to database management systems, one class of threat is known as SQL Injection, or more generally, code injection. It takes advantage of the dynamic execution capabilities of various programming languages, including dialects of SQL. Potentially, the attacker can gain unauthorized access to data, including security settings, and severely corrupt or destroy the database.

Even when no such hijacking takes place, invalid input that gets recorded in the database, whether accidental or malicious, reduces the reliability and usability of the system. Available protections include data types, referential constraints, uniqueness constraints, range checking, and application-specific logic. Application-specific logic can be implemented within the database in stored procedures and triggers, where appropriate.

This calls for inspection of application source code, which will require collaboration with the application developers. It is recognized that in many cases, the database administrator (DBA) is organizationally separate from the application developers, and may have limited, if any, access to source code. Nevertheless, protections of this type are so important to the secure operation of databases that they must not be ignored. At a minimum, the DBA must attempt to obtain assurances from the development organization that this issue has been addressed, and must document what has been discovered.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

Use parameterized queries, constraints, foreign keys, etc. to validate data input.

Modify SQL Server to properly use the correct column data types as required in the database.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_SQL_Server_2016_Y22M10_STIG.zip

Item Details

References: CAT|II, CCI|CCI-001310, Rule-ID|SV-213916r508025_rule, STIG-ID|SQL6-D0-002100, STIG-Legacy|SV-93801, STIG-Legacy|V-79095, Vuln-ID|V-213916

Plugin: MS_SQLDB

Control ID: f71968075d0203cdb4990423e81ae9c041aaf5346769a6cf3d84cf285ea8927b