Apache Solr is a widely used open-source search engine platform used by many organizations to manage their data. It is a popular choice because of its ability to handle high volumes of data and its fast speed in performing searches, making it an ideal tool for businesses with large amounts of data. Solr is normally registered at "/replication" under a Solr core, and it uses ReplicationHandler to replicate index data into the local core.
Recently, a vulnerability, CVE-2021-27905, was detected in Apache Solr. This vulnerability affected essentially all Solr versions prior to its fix in version 8.8.2. The ReplicationHandler in Solr has a "masterUrl" parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data. To prevent a SSRF (Server-Side Request Forgery) vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. However, prior to the fix, it did not, making it extremely vulnerable to attacks.
Exploitation of this vulnerability can lead to attacks on the core, allowing attackers to execute arbitrary code in the context of the Solr instance. Attackers could also use the vulnerability to bypass firewalls and other security measures to gain access to sensitive data. In addition, attackers could use this vulnerability to launch other attacks, such as Distributed Denial of Service (DDoS) attacks.
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REFERENCES
- https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb5559517145425074a42eb326b10%40%3Cannounce.apache.org%3E
- https://security.netapp.com/advisory/ntap-20210611-0009/
- lists.apache.org: [solr-users] 20210618 CVE-2021-27905 Apache Solr ReplicationHandler/SSRF vulnerability
- lists.apache.org: [solr-users] 20210618 Re: CVE-2021-27905 Apache Solr ReplicationHandler/SSRF vulnerability
- lists.apache.org: [solr-users] 20210728 Re: CVE-2021-27905 Apache Solr ReplicationHandler/SSRF vulnerability
- lists.apache.org: [ofbiz-notifications] 20210914 [jira] [Updated] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)
- lists.apache.org: [ofbiz-commits] 20210915 [ofbiz-plugins] branch release18.12 updated: Fixed: The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905) (OFBIZ-12316)
- lists.apache.org: [ofbiz-notifications] 20210915 [jira] [Commented] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)
- lists.apache.org: [ofbiz-notifications] 20210915 [jira] [Closed] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)
- lists.apache.org: [ofbiz-commits] 20210915 [ofbiz-plugins] branch trunk updated: Fixed: The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905) (OFBIZ-12316)
- lists.apache.org: [ofbiz-commits] 20210915 [ofbiz-plugins] branch release17.12 updated: Fixed: The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905) (OFBIZ-12316)
- lists.apache.org: [ofbiz-notifications] 20210915 [jira] [Updated] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)
To protect against this vulnerability, you can take the following precautions:
- Update to the latest version of Apache Solr.
- Monitor your logs and network activity for suspicious activity or requests.
- Use a web application firewall to prevent attacks.
- Implement strict input validation and parameter filtering to prevent SSRF attacks.
- Train your employees on how to identify and report potential security threats.
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