SQL Injection Attacks and Defense - 2009

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Blind SQL Injection Exploitation • Chapter 5 259 ■■ ■■ ■■ ■■ ■■ URL: www.0x90.org/releases/absinthe/ Requirements: Windows/Linux/Mac (.NET Framework or Mono) Scenario: Generic error page, controlled output Supported databases: Oracle, PostgreSQL, SQL Server, and Sybase Methods: Inference response-based binary search; classic errors Absinthe provides a handy GUI that enables an attacker to extract the full contents of a database; in addition, it contains enough configuration options to satisfy most injection scenarios and can utilize both classic error methods and response-based inference methods for data extraction. The response string that differentiates between two inference states must be easy for Absinthe to identify. One drawback to the tool is that the user cannot provide a customized signature for TRUE or FALSE states. Instead, the tool attempts to perform a diff on a TRUE and FALSE request, and this causes the tool to fail in cases where the page includes other data not influenced by the inference question. One example is in search pages that echo the search string back in the response. If two separate but equivalent inference exploits are provided, the two responses will each contain a unique search string rendering the diff meaningless. There is a tolerance you can fiddle with, but this is not as efficient as providing signatures. Figure 5.11 shows the main Absinthe screen. First, you select the injection type, either Blind Injection or Error Based, and then choose the database from a list of supported plug-ins. Enter the Target URL along with whether the request is formatted as a POST or a GET. Finally, enter in the Name textbox each parameter that should be contained in the request, along with a Default Value. If the parameter is susceptible to SQL injection, select the Injectable Parameter check box; also, select the Treat Value as String check box if the parameter is of type string in the SQL query. Do not forget to add in all parameters needed for the vulnerable page to process the request; this includes hidden fields such as __VIEWSTATE on .NET pages. Once the configuration is complete, click Initialize Injection. This sends a bunch of test requests to determine the response difference on which the inference will be based. If no errors are reported, click the DB Schema tab, which displays two active buttons: Retrieve Username and Load Table Info. The first button will retrieve and display the database login used by the vulnerable page and the second button will retrieve a list of userdefined tables from the current database. Once table information has been loaded, click a table name in the tree view of database objects and then click Load Field Info, which will retrieve a list of all column names in the selected table. As soon as that has completed, click the Download Records tab, provide an output filename in the Filename textbox, select the columns you wish to retrieve by clicking the column name and then clicking Add, and finally click Download Fields to XML. This will dump the selected columns to the output file, producing an XML document containing all rows from the selected columns in the target table.
260 Chapter 5 • Blind SQL Injection Exploitation Figure 5.11 Absinthe v1.4.1 Configuration Tab BSQL Hacker BSQL Hacker utilizes a number of inference techniques to enable the attacker to extract database contents, and is experimental in many of the approaches it implements. Although it is still in beta, there are numerous nifty features that bear exploration.
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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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■■ ■■ 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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Page 230 and 231: Exploiting SQL Injection • Chapte
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Page 238 and 239: Escalating Privileges Exploiting SQ
Page 240 and 241: Chapter 5 Blind SQL Injection Explo
Page 242 and 243: Blind SQL Injection Exploitation
Page 246 and 247: Common Blind SQL Injection Scenario
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Page 288 and 289: Summary Blind SQL Injection Exploit
Page 292 and 293: Chapter 6 Exploiting the Operating
Page 294 and 295: Exploiting the Operating System •
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Figure 6.22 Creating an UNSAFE Bina
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Exploiting the Operating System •
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Executing Operating System Commands
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Endnotes Exploiting the Operating S
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Chapter 7 Advanced Topics Solutions
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Using Case Variation Advanced Topic
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4. The application URL decodes the
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Advanced Topics • Chapter 7 323 D
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Using Hybrid Attacks Advanced Topic
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Exploiting Authenticated Vulnerabil
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Advanced Topics • Chapter 7 339
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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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