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01 Mar 15
Livern Chinsql hack
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19 Jan 15
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SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker).[1]
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in which malicious SQL statements are inserted into an entry field for execution
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for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.
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SQL injection (SQLI) is considered one of the top 10 web application vulnerabilities of 2007 and 2010 by the Open Web Application Security Project.[5] In 2013, SQLI was rated the number one attack on the OWASP top ten.[6] There are five main sub-classes of SQL injection:1
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12 Jan 15
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11 Dec 13
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malicious SQL statements are inserted into an entry field for execution
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22 Nov 13
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18 Jul 13
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attempt to get the website to pass a newly formed rogue SQL command to the database
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17 Oct 12
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user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed
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18 Sep 12
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19 Mar 12
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An SQL injection is often used to attack the security of a website by inputting SQL statements in a web form to get a poorly designed website to perform operations on the database (often to dump the database content to the attacker) other than the usual operations as intended by the designer. SQL injection is a code injection technique that exploits a security vulnerability in a website's software. The vulnerability happens when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL commands are thus injected from the web form into the database of an application (like queries) to change the database content or dump the database information like credit card or passwords to the attacker. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.
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24 Jan 12
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Incorrectly filtered escape characters
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SQL injection
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nputting SQL statements
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attack the security of a website
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to perform operations on the database
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exploits a security vulnerability
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SQL injection is a code injection technique
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user input is either incorrectly filtered for string literal escape characters embedded in SQL statements
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user input is not strongly typed
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vulnerability happens
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unexpectedly executed
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dump the database information
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change the database content
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can be used to attack any type of SQL databas
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Classic SQLIA
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Inference SQL Injection
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Interacting with SQL Injection
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DBMS specific SQLIA
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Compounded SQLIA
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Classic SQLIA is outdated
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Inference SQLIA
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its dynamic and flexible deployment as an attacking scenario
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DBMS specific SQLIA
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considered as supportive
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Compounded SQLIA
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erived
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research on SQL Injection Attacking Vector
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web application attacks
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combinatio
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SQL Injection + Insufficient authentication
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SQL Injection + DDos attacks[5]
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SQL Injection + DNS Hijacking
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SQL Injection + XSS
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Incorrectly filtered escape characters
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Technical Implementations
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ncorrectly filtered escape character
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user input is not filtered for escape characters
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occurs
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results
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potential manipulation of the statements
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statement = "SELECT * FROM users WHERE name = '" + userName + "';"
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this code
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used to force the selection of a valid username
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Incorrect type handling
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ncorrect type handlin
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not checked for type constraints
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occurs
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user-supplied field is not strongly typed
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numeric field
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user supplied input
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used in a SQL statement
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no checks to validate
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numeric
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thereby bypassing the need for escape characters
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manipulate the statement
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1;DROP TABLE users
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Blind SQL injection
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results of the injection
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not visible to the attacker
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will display differently depending
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results of a logical statement
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vulnerability may not be one that displays data
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time-intensive
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a new statement must be crafted for each bit recovered
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SELECT booktitle FROM booklist WHERE bookId = 'OOk14cd' AND '1'='1';
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result in a normal page
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SELECT booktitle FROM booklist WHERE bookId = 'OOk14cd' AND '1'='2';
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page is vulnerable to a SQL injectio
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give a different result
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Escaping
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escape characters
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special meaning in SQL
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prevent injections
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03 Jan 12
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14 Dec 11
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28 Sep 11
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11 Jul 11
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15 Jun 11
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26 Feb 11
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22 Jan 11
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11 Nov 10
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04 Nov 10
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18 Oct 10
Imke GideonsePreparedStatement prep = conn.prepareStatement("SELECT * FROM USERS WHERE USERNAME=? AND PASSWORD=?");
prep.setString(1, username);
prep.setString(2, password);
prep.executeQuery(); -
18 Aug 10
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17 Jun 10
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08 Jun 10
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Preventing SQL injection
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To protect against SQL injection, user input must not directly be embedded in SQL statements. Instead, parameterized statements must be used (preferred), or user input must be carefully escaped or filtered.
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Escaping
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A straight-forward, though error-prone, way to prevent injections is to escape characters that have a special meaning in SQL. The manual for an SQL DBMS explains which characters have a special meaning, which allows creating a comprehensive blacklist of characters that need translation. For instance, every occurrence of a single quote (
') in a parameter must be replaced by two single quotes ('') to form a valid SQL string literal. In PHP, for example, it is usual to escape parameters using the functionmysql_real_escape_stringbefore sending the SQL query: -
This is error prone because it is easy to forget to escape a given string.
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27 May 10
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07 Sep 09
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13 Aug 09
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12 Aug 09
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16 Jul 09
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18 Apr 09
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07 Apr 09
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SQL injection is a code injection technique that exploits a security vulnerability occurring in the database layer of an application.
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user input is not filtered for escape characters and is then passed into a SQL statement.
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SELECT * FROM users WHERE name = 'a' OR 't'='t';
If this code were to be used in an authentication procedure then this example could be used to force the selection of a valid username because the evaluation of 't'='t' is always true.
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multiple statements to be executed with one call, some SQL APIs such as php's mysql_query do not allow this for security reasons.
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To protect against SQL injection, user input must not directly be embedded in SQL statements. Instead, parameterized statements must be used (preferred), or user input must be carefully escaped or filtered.
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Enforcing the use of parameterized statements means that SQL statements with embedded user input are rejected at runtime. Currently only the H2 Database Engine supports this feature.
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29 Oct 08
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15 Sep 08
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16 May 08
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24 Mar 08
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29 Feb 08
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04 Feb 08
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20 Jan 08
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12 Dec 07
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30 Nov 07
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22 Oct 07
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17 Oct 07
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17 Sep 07
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02 Apr 07
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12 Dec 06
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27 Oct 06
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07 Sep 06
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10 Aug 06
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10 Jul 06
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07 Dec 05
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