CVE-2021-27905CWE-918

CVE-2021-27905: vulnerability in Apache Solr

SSRF vulnerability with the Replication handler

Published · Updated

40Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendepss 93%
exploitation probability
93%top 1% of all CVEs
observed exploitation
nono source reports it
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Affected
4 products
Red Hat JBoss Data Virtualization 6 · Red Hat JBoss Enterprise Application Platform 6 · Red Hat JBoss Fuse 6 · Red Hat JBoss Fuse Service Works 6
workaround: Restrict access to the replication handler to only internal Solr instances.
Not affected
3 products — because the vulnerable code is not present in the product
Red Hat Fuse 7 · Red Hat Integration Camel K 1 · Red Hat JBoss Web Server 3
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 products
Apache Software Foundation · Apache Solr
Related CVEs — Apache Solr

In the same product, most dangerous first.

CVE-2024-45216CRITICALApache Solr: Authentication bypass possible using a fake URL Path endingEPSS 92.7%CVE-2023-50386HIGHApache Solr: Backup/Restore APIs allow for deployment of executables in malicious ConfigSetsEPSS 83.7%CVE-2019-0192—CVE-2019-0192EPSS 78.2%CVE-2023-50290MEDIUMApache Solr: Host environment variables are published via the Metrics APIEPSS 68.4%CVE-2024-52012MEDIUMApache Solr: Configset upload on Windows allows arbitrary path write-accessEPSS 45.0%CVE-2018-1308—CVE-2018-1308EPSS 20.8%
References
https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb5559517145425074a42eb326b10%40%3Cannounce.apache.org%3Ehttps://lists.apache.org/thread.html/r140128dc6bb4f4e0b6a39e962c7ca25a8cbc8e48ed766176c931fccc%40%3Cusers.solr.apache.org%3Ehttps://lists.apache.org/thread.html/r3da74965aba2b5f5744b7289ad447306eeb2940c872801819faa9314%40%3Cusers.solr.apache.org%3Ehttps://lists.apache.org/thread.html/r6ccec7fc54d82591b23c143f1f6a6e38f6e03e75db70870e4cb14a1a%40%3Ccommits.ofbiz.apache.org%3Ehttps://lists.apache.org/thread.html/r720a4a0497fc90bad5feec8aa18b777912ee15c7eeb5f882adbf523e%40%3Ccommits.ofbiz.apache.org%3Ehttps://lists.apache.org/thread.html/r78a3a4f1138a1608b0c6d4a2ee7647848c1a20b0d5c652cd9b02c25a%40%3Ccommits.ofbiz.apache.org%3Ehttps://lists.apache.org/thread.html/r8f1152a43c36d878bbeb5a92f261e9efaf3af313b033d7acfccea59d%40%3Cnotifications.ofbiz.apache.org%3Ehttps://lists.apache.org/thread.html/r95df34bb158375948da82b4dfe9a1b5d528572d586584162f8f5aeef%40%3Cusers.solr.apache.org%3Ehttps://lists.apache.org/thread.html/rae9ccaecce9859f709ed1458545d90a4c07163070dc98b5e9e59057f%40%3Cnotifications.ofbiz.apache.org%3Ehttps://lists.apache.org/thread.html/rd232d77c57a8ce172359ab098df9512d8b37373ab87c444be911b430%40%3Cnotifications.ofbiz.apache.org%3Ehttps://lists.apache.org/thread.html/re9d64bb8e5dfefddcbf255adb4559e13a0df5b818da1b9b51329723f%40%3Cnotifications.ofbiz.apache.org%3Ehttps://security.netapp.com/advisory/ntap-20210611-0009/