CVE-2017-9797 in Geode
Summary
by MITRE
When an Apache Geode cluster before v1.2.1 is operating in secure mode, an unauthenticated client can enter multi-user authentication mode and send metadata messages. These metadata operations could leak information about application data types. In addition, an attacker could perform a denial of service attack on the cluster.
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Analysis
by VulDB Data Team • 11/21/2019
The vulnerability identified as CVE-2017-9797 affects Apache Geode clusters operating in secure mode prior to version 1.2.1, representing a significant security weakness that undermines the integrity of authentication mechanisms within the distributed data management system. This flaw allows unauthenticated clients to exploit a bypass mechanism that enables them to transition into multi-user authentication mode, thereby gaining access to metadata operations that should remain restricted to authenticated users only. The vulnerability stems from insufficient validation of client authentication states during cluster communication initiation, creating a pathway for unauthorized entities to manipulate the authentication flow and access sensitive operational information.
The technical implementation of this vulnerability involves the exploitation of a race condition or state management flaw in the cluster's authentication protocol where the system fails to properly verify client credentials before permitting metadata operations. When an unauthenticated client establishes a connection to the cluster, the system incorrectly permits the client to send metadata messages that contain information about application data types, effectively leaking internal system structure and data organization details. This metadata exposure represents a classification of information disclosure vulnerability, specifically aligning with CWE-200 which addresses "Information Exposure" and potentially CWE-312 which covers "Sensitive Data Exposure" in the context of distributed systems. The flaw enables attackers to gather intelligence about the cluster's internal data schema, application logic, and operational structure through the metadata messages that are typically protected from unauthorized access.
The operational impact of CVE-2017-9797 extends beyond simple information disclosure to include potential denial of service capabilities that can severely disrupt cluster operations and compromise system availability. Attackers can leverage this vulnerability to perform coordinated denial of service attacks by flooding the cluster with metadata operations that consume system resources and potentially cause service degradation or complete system unavailability. The combination of information leakage and denial of service capabilities makes this vulnerability particularly dangerous as it provides attackers with both reconnaissance capabilities and attack vectors for system disruption. This dual nature of the vulnerability aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation" and T1499 which addresses "Endpoint Denial of Service" in distributed computing environments. The vulnerability affects the confidentiality, integrity, and availability aspects of the system's security posture, creating a comprehensive threat vector that can be exploited by malicious actors.
Organizations utilizing Apache Geode clusters should implement immediate mitigation strategies including updating to version 1.2.1 or later, which contains the necessary authentication state validation fixes. Network segmentation and access controls should be implemented to limit client connectivity to the cluster, while monitoring systems should be deployed to detect anomalous metadata operations that may indicate exploitation attempts. Additional defensive measures include implementing strict authentication policies, enabling comprehensive logging of authentication events, and conducting regular security assessments to identify potential unauthorized access patterns. The vulnerability highlights the importance of proper state management in distributed systems and demonstrates the critical need for robust authentication mechanisms that prevent unauthorized transitions between authentication modes. Organizations should also consider implementing network-based intrusion detection systems that can identify and alert on suspicious metadata traffic patterns that may indicate exploitation of this vulnerability, as well as establishing incident response procedures specifically tailored to address distributed system security breaches involving authentication bypass scenarios.