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.
PoC: Solr-SSRF
Apache Solr SSRF(CVE-2021-27905)
PoC: CVE-2021-27905
[CVE-2021-27905] Apache Solr ReplicationHandler Server Side Request Forgery (SSRF)
PoC: CVE-2021-27905
Apache Solr < 8.8.2 Server Side Request Forgery
PoC: CVE-2021-27905.POC
POC for LFI related to CVE-2021-27905
PoC: Solr-SSRF
CVE-2021-27905
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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