As I read in a lot of articles, when I use JPA/Hibernate query it is good to set parameters in my queries so SQL injection is avoided. Like:
select user from User user where user.name = :name and user.surname = :surname
My problem is that in some cases I need to use native query when I create my query.
I will use my entity manager and createNativeQuery. But in this case the parameters will be positional. Like:
select * from users where user_name = ? and user_surname = ?
Then in my query I will use the method setParameter(1, "name") etc. So is this case "sql injection proof" like when in the parameterized query?
if you do not use string operations for building your query like
"SELECT foo FROM bar Where id="+myParameter+" more sql ..."
, then you will not have any vulnerabilities.
Currently (community correct me if I am wrong) no vulnerabilities exist within the latest PDO database abstraction layer.
However testing your queries for known and unknowns while sanitizing and filtering input will help eliminate the possibility of an injection in the event of a zero day exploit.
I currently use a combination of filtering input, charset expectations, stored procedures and strict requirements on their arguments prior to any and all dynamically created queries
Related
I'm working with JPA. How could my application be SQL injection safe if I'm using a native sql query (not entity query)? I need to build the native sql query with the data submitted by a user from a html form.
If I use parameters in the native sql I can avoid SQL injection attacks, but my problem is that I can't be sure how many data fields are being submitted by the user.
You should use positional parameters binding:
String queryString = "select * from EMP e where e.name = ?1";
Query query = em.createNativeQuery(queryString, Employee.class);
query.setParameter(1, "Mickey");
Please note that you should not use named parameters binding (:empName) in your query as JPA Spec says
Only positional parameter binding may be portably used for native queries.
This should secure you from SQL Injection attacks.
Hello for demonstration purposes I trimmed out my actual sql query.
I have a SQL query
SELECT *
FROM dbdev.training.courses
where dbdev is my DEV database table name. When I migrate to TEST env, I want my query to dynamically change to
SELECT *
FROM dbtest.training.courses
I tried using input parameters like {env: p('db_name')} and using in the query as
SELECT * FROM :env.training.courses
or
SELECT * FROM (:env).training.courses
but none of them worked. I don't want my SQL query in properties file.
Can you please suggest a way to write my SQL query dynamically based on environment?
The only alternative way is to deploy separate jars for different environments with different code.
You can set the value of the property to a variable and then use the variable with string interpolation.
Warning: creating dynamic SQL queries using any kind of string manipulation may expose your application to SQL injection security vulnerabilities.
Example:
#['SELECT * FROM $(vars.database default "dbtest").training.courses']
Actually, you can do a completely dynamic or partially dynamic query using the MuleSoft DB connector.
Please see this repo:
https://github.com/TheComputerClassroom/dynamicSQLGETandPATCH
Also, I'm about to post an update that allows joins.
At a high level, this is a "Query Builder" where the code that builds the query is written in DataWeave 2. I'm working on another version that allows joins between entities, too.
If you have questions, feel free to reply.
One way to do it is :
Create a variable before DB Connector:
getTableName - ${env}.training.courses
Write SQL Query :
Select * from $(getTableName);
We have to work with older version of an ERP system (1993).
It has multiple modules. These modules have windows(tabs). Tabs have cols (obviously).
In this tabs the USER can make a "new column" -> it's like a subquery. Query can be used only in parentheses ().
I'm just curious, is it possible to make an injection by user.
e.g.:
--basic query (self join)
(select i.my_col from my_table i where my_pk = i.pk)
--illlustrating
(select replace(i.my_col, 'UPDATE...') from my_table i where my_pk = i.pk)
Is there any way to make the second query workable ? I mean, can the user somehow update columns whit this method ?
How can i test it ?
Dynamic values can be handled for where condition through preparedStatement and setParameter however unfortunately that option is not available for dynamic column selection.
The best thing can be done is to have all possible/applicable column names before you pass to the query.
// check if my_col is possible values else throw the error.
(select replace(i.my_col, 'UPDATE...') from my_table i where my_pk = i.pk)
Avoiding SQL injection is down to the mechanism which turns the user's input into executable statements. The actual example you posted won't run, but I can think of ways it might be possible to hijack the SELECT to run malicious DML. It depends on the framework: given that the underlying software is ancient I suspect it might be extremely vulnerable.
Generally speaking, if you're worried about SQL Injection you should investigate using Oracle's built-in DBMS_ASSERT package to verify your SQL strings. Find out more
From https://en.wikipedia.org/wiki/Code_injection#Preventing_problems
To prevent code injection problems, utilize secure input and output handling, such as:
Using APIs that, if used properly, are secure against all input characters. Parameterized queries (also known as "Compiled queries", "prepared statements", "bound variables") allows for moving user data out of string to be interpreted. Additionally Criteria API[7] and similar APIs move away from the concept of command strings to be created and interpreted.
I was wondering how and why "parameterized queries (also known as "Compiled queries", "prepared statements", "bound variables") allows for moving user data out of string to be interpreted" and prevent or mitigate code injection problems?
Can you also provide some examples in explanation?
Thanks.
Compiled queries use special syntax that the database understands. They usually add placeholders for parameters such as in:
select * from applicant where name = ?
select * from applicant where name = :name
The exact syntax depends on the specific technology: JDBC, ODBC, etc.
Now, once those queries are sent to the database (without the specific parameter values), the database "saves" them. Later on (usually in the same database session), you can run them many times, by just providing the parameter values each time.
SQL Injection Safety
They are also safe against SQL injection. For example, if in the previous query instead of a simple value such as Mary you used the value x'; delete from applicant; -- the database will work safely. It would run something like:
select * from applicant where name = 'x; delete from applicant; --'
This query won't probably find anything and will be safe.
If instead you didn't use compiled query, but just decided to concatenate the SQL as a string you would do something like:
String sql = "select * from applicant where name = '" + param1 + "'";
And would end up with the UNSAFE query:
select * from applicant where name = 'x'; delete from applicant; --
This one would run two queries. The second one will delete all the information from your table. Probably not what you want.
SELECT verlog.bearerid, detail.snum
FROM verlog
INNER JOIN detail
ON verlog.txnid = detail.txnid
WHERE verlog.bearerid ='"+ TextBox1.Text +"'
is this the right way to obtain the value of a text box and use it in a where clause?
By constructing the statement in this way you open yourself up to SQL injection attacks in which users may be able to run additional sql against your database.
You can protect against this by using parameterised sql. Then pass both the query and the parameters when executing.
SELECT verlog.bearerid, detail.snum
FROM verlog
INNER JOIN detail
ON verlog.txnid = detail.txnid
WHERE verlog.bearerid = #bearerid
Further details can be read here: http://www.csharp-station.com/Tutorial/AdoDotNet/lesson06
Alternatively you can use an ORM which will handle this for you.
I seggest not to write scripts as you mentioned; that would pave the way of injection. If not using any ORM technology such as Entity framework which in turn calls for its own security issues as well, always stick into parametric ado.net queries. Look at this link