CVE-2017-9325 in Search
Summary
by MITRE
The provided secure solrconfig.xml sample configuration does not enforce Sentry authorization on /update/json/docs.
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Analysis
by VulDB Data Team • 06/30/2020
The vulnerability described in CVE-2017-9325 resides within Apache Solr's security configuration practices, specifically targeting the default sample configuration file known as solrconfig.xml. This flaw represents a critical oversight in access control implementation where the security measures designed to protect sensitive data and operations are inadequately enforced. The vulnerability manifests when the sample configuration file fails to properly implement Sentry authorization mechanisms, creating a potential security gap that could be exploited by unauthorized actors. The issue directly impacts the /update/json/docs endpoint, which serves as a critical interface for data ingestion and modification within the Solr search platform.
The technical root cause of this vulnerability stems from improper authorization enforcement within the Solr configuration framework. When administrators deploy the sample solrconfig.xml file without modification, they inherit a configuration that lacks proper authentication and authorization controls for the JSON update endpoint. This configuration flaw allows malicious actors to potentially bypass security controls and perform unauthorized data updates or modifications through the /update/json/docs interface. The vulnerability aligns with CWE-284, which addresses improper access control issues, and represents a failure in implementing proper privilege separation and authorization checking. The flaw essentially creates a backdoor through which unauthorized users could gain write access to the Solr index, potentially leading to data corruption, information disclosure, or complete system compromise.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass broader security implications for organizations relying on Solr for their data management and search capabilities. Attackers exploiting this vulnerability could modify or delete critical data, inject malicious content into search indexes, or manipulate search results to redirect users to malicious websites. The implications are particularly severe in environments where Solr serves as a central data repository for applications, databases, or enterprise search systems. Organizations may experience data integrity issues, compliance violations, and potential regulatory penalties if sensitive information is compromised through unauthorized modifications. This vulnerability also enables potential attackers to escalate privileges and gain deeper access to the underlying system infrastructure, as the compromised Solr instance often serves as a gateway to other internal systems.
Mitigation strategies for CVE-2017-9325 should focus on implementing proper authorization controls through the Sentry authorization framework and ensuring that all Solr configurations enforce appropriate access controls. Organizations must modify their solrconfig.xml files to include proper authorization checks for the /update/json/docs endpoint and other sensitive interfaces. This includes configuring appropriate authentication mechanisms, implementing role-based access controls, and ensuring that only authorized users or applications can perform data modification operations. The solution aligns with ATT&CK technique T1078 which addresses valid accounts and privilege escalation. Security teams should also implement network segmentation, monitor access logs for suspicious activities, and regularly audit their Solr configurations to prevent similar issues. Additionally, organizations should consider implementing additional security layers such as API gateways, web application firewalls, and regular security assessments to protect against exploitation of such configuration flaws. The remediation process requires careful attention to ensure that security controls are properly implemented without disrupting legitimate business operations while maintaining the integrity and availability of the Solr search platform.