SQL Injection Attacks and Defense - 2009

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Exploiting the Operating System • Chapter 6 283 With this information he moves on, effectively replicating the commands he executed within the Query Analyzer program through the browser, leaving the following odd-looking query: http://intranet/admin/staff.asp?sname='; create table hacked(line varchar(8000)); bulk insert hacked from 'c:\boot.ini';-- This allows the attacker to run a subsequent query to obtain the results of this newly created table (displayed in Figure 6.8). Figure 6.8 Reading a File through Microsoft SQL Server Of course, not every application will return results in such a convenient fashion, but once the bulk insert has been done, an attacker can use any of the extrusion methods covered in Chapters 4 and 5 to extract this data from the database. By setting CODEPAGE=‘RAW’ when doing a BULK INSERT an attacker can even upload binary files into SQL Server, which he can rebuild after extracting it through the application. SensePost’s Squeeza tool automates this process through the use of its !copy mode, enabling an attacker to perform the bulk insert in a temporary table in the background, and then use the communication mechanism of choice (DNS, error messages, timing) to extract the information before rebuilding the file on his machine. You can test this by picking an arbitrary binary file on the remote machine (c:\winnt\system32\net.exe) and obtaining its MD5 hash value. Figure 6.9 shows the hash value obtained for the system’s net.exe binary.
284 Chapter 6 • Exploiting the Operating System Figure 6.9 An MD5 Hash of net.exe Using a squeeza.config file that is aimed at our target application, let’s fetch two files: the remote server’s boot.ini and the binary c:\winnt\system32\net.exe. Figure 6.10 displays the rather terse output from Squeeza. Figure 6.10 Copying a Binary from the Remote Server If all went well, we should be able to read the contents of the stolen-boot.ini and compare the checksum on the stolen-net.exe: [haroon@hydra squeeza]$ cat stolen-boot.ini [boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(1)\WINNT
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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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Common Blind SQL Injection Scenario
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1. Is the byte greater than 127? No
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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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■■ ■■ ■■ ■■ Referen
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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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