× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



On 09-Apr-2012 12:34 , Nathan Andelin wrote:
RPG Code:

http://code.midrange.com/d2dfaae4db.html

SQL injection can be fun ;-) What if the value for the char(10) variables ytmlink.district and ytmlink.school [as presumed input from a user] are the following [non-delimited by quotation marks] string?:
"'or 1='1 "

If accepted as input, then the expression:
filter = 'DISTRICT = ' + squote + ytmlink.district + squote +
' AND SCHOOL = ' + squote + ytmlink.school + squote;

Evaluates to the string:
DISTRICT = ''or 1='1 ' AND SCHOOL = ''or 1='1 '

Even if the application avoids injection by some means of validity checking the input, the SQL as coded is not very reusable if\when stored in the cache "as is", because the values are literals instead of parameter markers. The SQL is made safe from injection, more directly enabled capable for reuse, and IMO much more readable when constructed as a string when using instead the expression:
filter = 'DISTRICT = ? AND SCHOOL = ?';

Regards, Chuck

As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.