Ensure 'Symmetric Key encryption algorithm' is set to 'AES_128' or higher in non-system databases

보통레벨 1자동mssql

설명

Per the Microsoft Best Practices, only the SQL Server AES algorithm options, AES_128, AES_192, and AES_256, should be used for a symmetric key encryption algorithm. The following algorithms (as referred to by SQL Server) are considered weak or deprecated and should no longer be used in SQL Server: DES, DESX, RC2, RC4, RC4_128. Many organizations may accept the Triple DES algorithms (TDEA) which use keying options 1 (3 key aka 3TDEA) or keying option 2 (2 key aka 2TDEA). In SQL Server, these are referred to as TRIPLE_DES_3KEY and TRIPLE_DES respectively. Additionally, the SQL Server algorithm named DESX is actually the same implementation as the TRIPLE_DES_3KEY option. However, using the DESX identifier as the algorithm type has been deprecated and its usage is now discouraged.

점검 방법

감사 방식: SQL 쿼리

sql_query

sqlcmd -b -h -1 -W -Q "SET NOCOUNT ON; DECLARE @n int = 0, @k int, @db sysname, @s nvarchar(max); DECLARE c CURSOR LOCAL FAST_FORWARD FOR SELECT name FROM sys.databases WHERE state = 0 AND HAS_DBACCESS(name) = 1 AND database_id > 4; OPEN c; FETCH NEXT FROM c INTO @db; WHILE @@FETCH_STATUS = 0 BEGIN SET @s = N'USE ' + QUOTENAME(@db) + N'; SELECT @k = COUNT(*) FROM (SELECT name FROM sys.symmetric_keys WHERE algorithm_desc NOT IN (''AES_128'',''AES_192'',''AES_256'')) AS x;'; EXEC sp_executesql @s, N'@k int OUTPUT', @k = @k OUTPUT; SET @n = @n + @k; FETCH NEXT FROM c INTO @db; END; CLOSE c; DEALLOCATE c; SELECT @n;"

예상 출력: 0

조치 방법

조치 방식: 가이드 또는 인프라 패치

Refer to Microsoft SQL Server Books Online ALTER SYMMETRIC KEY entry: https://docs.microsoft.com/en-us/sql/t-sql/statements/alter-symmetric-key-transact-sql

속성

운영 체제: 모두
태그: cryptoencryptionmssqlsqlserver-2022
참고 자료: CIS Microsoft SQL Server 2022 Benchmark v1.3.0 - 7.1 Ensure 'Symmetric Key encryption algorithm' is set to 'AES_128' or higher in non-system databases

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