CVE-2021-27905

Summary

The ReplicationHandler (normally registered at "/replication" under a Solr core) in Apache Solr 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.

Affected Software

VendorProductVersion RangeStatus
Apache Software FoundationApache SolrApache Solr < 8.8.2affected

Weaknesses

  • CWE-918: CWE-918 Server-Side Request Forgery (SSRF)

Workarounds

Ensure that any access to the replication handler is purely internal to Solr. Typically, it's only accessed externally for diagnostic/informational purposes.

ADP Enrichment

CVE Program Container

Additional References

References