DefinedAttributeTemplateEngine parsing bug

[kkolman]

Passing the following sql query

String sql = "SELECT '\\\\' = '\\\\'";
Handle handle = jdbi.open());
       handle.createQuery(sql)

In SqlStatement.java

jdbi/core/src/main/java/org/jdbi/v3/core/statement/SqlStatement.java

Line 1806 in 34a81e7

String renderedSql = statements.preparedRender(sql, ctx);

renderedSql

• will then have string value of SELECT '\\' = '\' (single backslash on the right side of the equals sign)
• instead of SELECT '\\' = '\\' (double backslash on the right side of the equals sign)

[macabrus]

This looks serious, has it been fixed? Is DefinedAttributeTemplateEngine used by default? If so, is my application vulnerable to injections?

[stevenschlansker]

Unfortunately no. I'd happily review any community contributions to fix it, otherwise it's on my radar to spend some time fixing soon. I'm not quite sure how difficult the fix is.

Unfortunately, it's also hard for me to evaluate whether it makes your application vulnerable to injection. But I do agree this is important to fix.

[stevenschlansker]

@kkolman @macabrus , I opened #2034 which should fix this. Would either of you be able to build jdbi and verify that it fixes the issue for you? We'll include it in the next release. Thanks!

[stevenschlansker]

Also, I don't think there is much security risk - you already should not be interpolating user provided data into template strings, but instead bind them as parameters. As long as all user provided data is properly bound as parameters there should be minimal risk.

[stevenschlansker]

Fixed in 3.30.0

[stevenschlansker]

This fix was reverted due to breakage reported in #2084 :(