This issue was publicly discovered on February 24, 2019. It is possible that a malicious user/process could send SQL statements to the SQL Server service that could be executed by a privileged user account. It is also possible that a malicious user/process could send SQL statements to the SQL Database service. In this case, the SQL Database service would accept and execute the SQL statements. A remote attacker could exploit this issue to execute arbitrary code with SYSTEM privileges on the target system. This issue affects SQL Server 2019.0 (17.0.2188.0) on Windows. It might affect other versions and operating systems. What can be done to prevent it? This issue can be prevented by installing software updates on the system. In order to prevent data from being sent to the server and accepted by the server, SQL injection prevention software such as SQL Sentry can be used.
CVE-2021-35833
The issue was publicly disclosed on February 24, 2019. It is possible that a malicious user/process could send SQL statements to the SQL Server service that could be executed by a privileged user account. It is also possible that a malicious user/process could send SQL statements to the SQL Database service. In this case, the SQL Database service would accept and execute the SQL statements. A remote attacker could exploit this issue to execute arbitrary code with SYSTEM privileges on the target system. This issue affects SQL Server 2016 (14.0.2016) on Windows. What can be done to prevent it? This issue can be prevented by installing software updates on the system. In order to prevent data from being sent to the server and accepted by the server, SQL injection prevention software such as SQL Sentry can be used.
In conclusion:
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Critical Thing to Know :
This issue affects SQL Server 2019.0 (17.0.2188.0) on Windows
The issue involves an input validation flaw in the SQL Server service that could allow a malicious user/process to execute arbitrary code with SYSTEM privileges on the target system.
What can be done to prevent it?
SQL injection prevention software such as SQL Sentry can be used to prevent data from being sent to the server and accepted by the server.
SQL Server Database Engine Stored Procedure Execution
The SQL Server Database Engine service can be abused to execute stored procedures. This issue is being actively exploited in the wild and has been publicly disclosed by Microsoft. A malicious user/process could send SQL statements to the SQL Server service that could be executed by a privileged user account. In this case, the SQL Server service would accept and execute the SQL statements. This issue affects SQL Server 2019.0 (17.0.2188.0) on Windows. It might affect other versions and operating systems. What can be done to prevent it? This issue can be prevented by installing software updates on the system or using third-party solutions such as SQL Sentry or an equivalent tool to prevent data from being sent to the server and accepted by the server, especially when using stored procedures with EXECUTE AS OWNER permission, which is not recommended practice for stored procedures that are not intended for execution at a high privilege level
SQL Sentry
SQL Sentry is the most complete and robust SQL injection prevention solution. It prevents SQL injections on all versions of the Microsoft SQL Server database engine, including those running on Windows, Linux, and Mac OS X. It supports both native and ODBC drivers, as well as custom drivers written in C/C++ and any other programming language that can be compiled to run on Windows.
Timeline
Published on: 09/13/2022 19:15:00 UTC
Last modified on: 09/16/2022 17:35:00 UTC