Date: Mon, 12 Apr 2021 16:09:59 -0500 From: Mike Drob <mdrob@...che.org> To: oss-security@...ts.openwall.com Subject: CVE-2021-27905: Apache Solr: SSRF vulnerability with the Replication handler Description: The ReplicationHandler (normally registered at "/replication" under a Solr core) has a "masterUrl" (also "leaderUrl" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. Prior to this bug getting fixed, it did not. This problem affects essentially all Solr versions prior to it getting fixed in 8.8.2. This issue is being tracked as SOLR-15217 Mitigation: Ensure that any access to the replication handler is purely internal to Solr. Typically, it's only accessed externally for diagnostic/informational purposes. Credit: Reported by Caolinhong(Skay) from QI-ANXIN Cert (QI-ANXIN Technology Group Inc.)
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