SQL Injection Attacks and Defense - 2009

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Exploiting the Operating System • Chapter 6 275 With the table ready to accept the text file, we’ll populate the table with the following command: mysql> load data infile '/tmp/users.txt' into table authors fields terminated by ' '; Query OK, 10 rows affected (0.00 sec) Records: 10 Deleted: 0 Skipped: 0 Warnings: 0 A quick select on the authors table reveals that the text file has been perfectly imported into the database: mysql> select * from authors; +-----------+---------------+------------------------------+------+ | fname | sname | email | flag | +-----------+---------------+------------------------------+------+ | haroon | meer | haroon@fakedomain.com | 1 | | Dafydd | Stuttard | mail@fakedomain.net | 1 | | Dave | Hartley | dave@fakedomain.co.uk | 1 | | Rodrigo | Marcos | rodrigo@fakedomain.com | 1 | | Gary | Oleary-Steele | garyo@fakedomain.com | 1 | | Joe | Hemler | joe@fakedomain.com | 1 | | Marco | Slaviero | marco@fakedomain.com | 1 | | Alberto | Revelli | r00t@fakedomain.net | 1 | | Alexander | Kornbrust | ak@fakedomain.com | 1 | | Justin | Clarke | justin@fakedomain.com | 1 | +-----------+---------------+------------------------------+------+ 10 rows in set (0.00 sec) For easier hacking fun, MySQL also provides the LOAD_FILE function, which allows you to avoid first creating a table, and goes straight to delivering the results: mysql> select LOAD_FILE('/tmp/test.txt'); +--------------------------------------------------------------------------+ | LOAD_FILE('/tmp/test.txt') | +--------------------------------------------------------------------------+ | This is an arbitrary file residing somewhere on the filesystem It can be multi-line and it does not really matter how many lines are in it… | +-------------------------------------------------------------------------+ 1 row in set (0.00 sec)
276 Chapter 6 • Exploiting the Operating System Now, since the focus of this book is SQL injection, it would probably make sense to observe this within an injected SQL statement. To test this, consider the fictitious and vulnerable intranet site (shown in Figure 6.1) that allows a user to search for customers. Figure 6.1 Sample Vulnerable Intranet Application The site is vulnerable to injection, and since it returns output directly to your browser it is a prime candidate for a union statement. For purposes of illustration, this site also displays the actual generated SQL query as a DEBUG message. The results of a simple search for “a” appear in Figure 6.2.
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Justin Clarke Lead Author and Techn
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Lead Author and Technical Editor Ju
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exploiting, and correcting software
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Dafydd Stuttard is the author of th
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Contents Chapter 1 What Is SQL Inje
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Contents xi LAPSE. ................
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Contents xiii Generic MySQL Binary
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Contents xv Chapter 8 Code-Level De
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Contents xvii Increase the Verbosit
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Contents xix Ingres Cheat Sheet....
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Chapter 1 What Is SQL Injection? So
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What Is SQL Injection? • Chapter
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execute the query against the datab
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Incorrectly Handled Query Assembly
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} } reader = cmd.ExecuteReader(); r
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Chapter 2 Testing for SQL Injection
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Testing for SQL Injection • Chapt
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SELECT * FROM products WHERE idprod
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Figure 2.15 Exploitation Terminatin
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Time Delays Testing for SQL Injecti
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Summary Testing for SQL Injection
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Chapter 3 Reviewing Code for SQL In
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Reviewing Code for SQL Injection
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mssql_bind() − adds a parameter t
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OdbcCommand() − used to construct
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Reviewing PL/SQL and T-SQL Code Rev
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■■ ■■ ■■ ■■ URL: ht
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■■ ■■ Platform: Windows Pri
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Summary Reviewing Code for SQL Inje
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Frequently Asked Questions Reviewin
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Chapter 4 Exploiting SQL Injection
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Exploiting SQL Injection • Chapte
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Approach 3: Content-based Exploitin
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Error Messages in Oracle Exploiting
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MySQL Exploiting SQL Injection •
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Such a query will return output sim
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SELECT name,spare4 FROM sys.user$ w
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[+] Bruteforcing the sa password. T
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select user_name,web_password_raw f
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HTTP/DNS Exploiting SQL Injection
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Summary Exploiting SQL Injection
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Escalating Privileges Exploiting SQ
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Chapter 5 Blind SQL Injection Explo
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Blind SQL Injection Exploitation
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Blind SQL Injection Exploitation
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Page 288 and 289: Summary Blind SQL Injection Exploit
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Advanced Topics • Chapter 7 325 I
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Using Hybrid Attacks Advanced Topic
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Exploiting Authenticated Vulnerabil
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Chapter 8 Code-Level Defenses Solut
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Code-Level Defenses • Chapter 8 3
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END; Execute immediate 'SELECT coun
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Validating Input in Java Code-Level
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UTL_SMTP.HELO(v_connection,'mailhos
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Summary Code-Level Defenses • Cha
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Chapter 9 Platform-Level Defenses S
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Platform-Level Defenses • Chapter
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Figure 9.3 Whitelist Rule to Patch
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Application Filters Platform-Level
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Use Strong Cryptography to Protect
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Additional Deployment Consideration
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Chapter 10 References Solutions in
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References • Chapter 10 417 For t
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References • Chapter 10 419 It is
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GROUP BY Statement References • C
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References • Chapter 10 423 you a
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References • Chapter 10 425 Table
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Blind SQL Injection Functions: Micr
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References • Chapter 10 429 the S
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Microsoft SQL Server 2005 Hashes Re
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References • Chapter 10 435 If MA
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TYPE oracle_loader DEFAULT DIRECTOR
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References • Chapter 10 441 When
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Table 10.20 Continued. Troubleshoot
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Enumerating Database Configuration
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Local File Access References • Ch
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References • Chapter 10 451 Infor
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Troubleshooting SQL Injection Attac
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A abstract syntax tree (AST), 125 a
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Index 461 confirming and terminatin
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Index 463 errors application error,
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Index 465 intercepting filters appl
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Index 467 APEX, 196-197 Oracle inte
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Index 469 mysql_query( ) function,
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Index 471 blind SQL injection funct
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Index 473 transformation functions,
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SQL Injection Attacks and Defense - 2009

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