> a free and open-source relational database management system emphasizing extensibility and technical standards compliance. We will take a look into bypass methods for web application firewalls, ways of exfiltrating data in different query clauses, such as SELECT, WHERE, ORDER BY, FROM.
This post revolves around general analysis, exploitation and discovery of SQL Injection vulnerabilities in app using the Postgres DMBS. This post covers bypass methods, example data exfiltration methods, and quick, easy to use payloads that will make the application sleep if it is vulnerable, so you can easily test parameters. This is some research I developed for () based around SQL Injections throughout multiple PostgreSQL clauses. Here is an example rule: SecRule REQUEST_FILENAME|ARGS_NAMES|ARGS|XML:/* "\bunion\b.# Researching around SQL Injections in PostgreSQL. The ModSecurity CRS has a number of rules that detect SQL injection attacks that utilize the UNION and SELECT keywords. However the SQL payload, when executed by the MySQL DB, looked something like this: 0 div 1 union select 1,2,current_user The resulting SQL payload looked something like this: 0 div 1 union#foo*/*bar Let's take a look at the first request he used (to extract the DB user).
The highlighted section is the feature that Johannes used (with %0D%0A as the new line characters). Mysql> SELECT 1+ /* this is a multiple-line comment */ 1 Mysql> SELECT 1 /* this is an in-line comment */ + 1 Mysql> SELECT 1+1 - This comment continues to the end of line The following example demonstrates all three comment styles: mysql> SELECT 1+1 # This comment continues to the end of line This syntax enables a comment to extend over multiple lines because the beginning and closing sequences need not be on the same line. This syntax differs slightly from standard SQL comment syntax, as discussed in Section 1.8.5.5, "' -' as the Start of a Comment".įrom a /* sequence to the following */ sequence, as in the C programming language. In MySQL, the " - " (double-dash) comment style requires the second dash to be followed by at least one whitespace or control character (such as a space, tab, newline, and so on). First of all, let's review the MySQL Reference Guide information about Comments:įrom a " #" character to the end of the line.įrom a " - " sequence to the end of the line. Johannes used a combination of MySQL comments and new line characters to both have a working SQL Injection payload and to evade the current CRS SQLi filters. Target Application: Acunetix Acuart Site Example Bypass Request Let's take a look at each bypass in-depth so that we see how the bypass was achieved and also highlight the changes made to the CRS to make them stronger. The focus of this blog post is to provide an in-depth discussion of the Level II bypasses that were identifies during the SQLi Challenge. Level II Bypasses Analysis: In-DepthĬongratulations goes to the following individuals/teams that achieve Level II status by extracting DB information while evading the inbound CRS SQL Injection rules.
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The end result of this challenge is that the SQL Injection rules within the CRS have been massively updated and are now available for immediate download as part of the v2.2.1 release. This type of community testing has helped to both validate the strengths and expose the weaknesses of the SQL Injection protections of the OWASP ModSecurity Core Rule Set Project. All told, we had > 650 participants (based on unique IP addresses) which is a tremendous turn out. This is a post-mortem blog post to discuss the successful Level II evasions found by participants during the recent ModSecurity SQL Injection Challenge.įirst of all, I would like to thank all those people that participated in the challenge.
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