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This vulnerability in Apache Solr 6.0.0 to 6.6.3, 7.0.0 to 7.3.0 relates to an XML external entity expansion (XXE) in Solr config files (solrconfig.xml, schema.xml, managed-schema). In addition, Xinclude functionality provided in these config files is also affected in a similar way. The vulnerability can be used as XXE using file/ftp/http protocols in order to read arbitrary local files from the Solr server or the internal network. Users are advised to upgrade to either Solr 6.6.4 or Solr 7.3.1 releases both of which address the vulnerability. Once upgrade is complete, no other steps are required. Those releases only allow external entities and Xincludes that refer to local files / zookeeper resources below the Solr instance directory (using Solr's ResourceLoader); usage of absolute URLs is denied. Keep in mind, that external entities and XInclude are explicitly supported to better structure config files in large installations. Before Solr 6 this was no problem, as config files were not accessible through the APIs.

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Apache Solr 安全漏洞

Apache Solr是美国阿帕奇（Apache）软件基金会的一款基于Lucene（一个全文检索引擎的架构）的搜索服务器，它支持层面搜索、垂直搜索、高亮显示搜索结果、多种输出格式等。 Apache Solr 6.0.0版本至6.6.3版本和7.0.0版本至7.3.0版本中的solrconfig.xml、schema.xml和managed-schema（Solr配置文件）存在XML外部实体注入漏洞。攻击者可利用该漏洞读取Solr服务器及内部网络上的任意本地文件。

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