published April 13, 2021
NVD has not assigned a CVSS score to this record. It sits in the 99.8th percentile for exploit probability.
⚠️ A misconfigured "masterUrl" could open the door to some sneaky Server-Side Request Forgery (SSRF) exploits in Apache Solr! Think of the ReplicationHandler as a delivery service that fetches packages from another core. If it’s not checking the sender's address, it might take in a suspicious package — something that could contain nasty surprises. An attacker could trick Solr into fetching data from an unauthorized external source, potentially exposing sensitive information or even allowing for additional attacks. This could lead to a significant breach in security, compromising the integrity of your Solr instance.
Think of the ReplicationHandler as a delivery service that fetches packages from another core. If it’s not checking the sender's address, it might take in a suspicious package — something that could contain nasty surprises. The vulnerability arises from the lack of validation on the "masterUrl" (or "leaderUrl") parameter used by Solr's ReplicationHandler, allowing SSRF attacks by not checking it against defined shard configurations.
An attacker could trick Solr into fetching data from an unauthorized external source, potentially exposing sensitive information or even allowing for additional attacks. This could lead to a significant breach in security, compromising the integrity of your Solr instance. Update your Solr instance to version 8.8.2 or later to patch this vulnerability. Ensure that your configurations are set properly and consider reviewing your access controls to mitigate further risks. You've got this! By following these steps, you'll bolster your defenses and keep that Solr instance safe and sound! 🛡️