CVE-2020-35211 in Atomix
Summary
by MITRE • 12/16/2021
An issue in Atomix v3.1.5 allows unauthorized Atomix nodes to become the lead node in a target cluster via manipulation of the variable terms in RaftContext.
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Analysis
by VulDB Data Team • 12/22/2021
The vulnerability identified as CVE-2020-35211 resides within Atomix v3.1.5, a distributed systems framework that implements the Raft consensus algorithm for managing replicated state machines. This flaw represents a critical security weakness in the cluster leadership election process that can be exploited by unauthorized nodes to gain control over target clusters. The vulnerability specifically targets the RaftContext variable terms that govern how nodes determine leadership eligibility and transition roles within the distributed system.
The technical root cause of this vulnerability lies in the insufficient validation and manipulation of Raft consensus parameters that control leadership election dynamics. Attackers can exploit this weakness by crafting malicious RaftContext variable terms that manipulate the election process to favor unauthorized nodes. The vulnerability stems from inadequate input sanitization and validation mechanisms within the consensus protocol implementation, allowing malicious actors to inject falsified terms that influence the leader election algorithm. This manipulation occurs at the core of the Raft consensus mechanism where nodes must agree on leadership terms, effectively enabling privilege escalation through consensus protocol subversion.
The operational impact of CVE-2020-35211 extends beyond simple unauthorized access to potentially catastrophic system compromise. An attacker who successfully manipulates the RaftContext terms can assume leadership role within the target cluster, gaining control over critical distributed operations and state management. This leadership takeover enables the attacker to modify cluster configurations, manipulate replicated data, and potentially disrupt service availability. The vulnerability affects the fundamental integrity of the distributed consensus mechanism, undermining the security model that Atomix relies upon to maintain cluster consistency and authorization boundaries. Organizations utilizing Atomix for critical infrastructure or data management systems face significant risk of data corruption, service disruption, and unauthorized access to distributed resources.
Mitigation strategies for this vulnerability require immediate implementation of several defensive measures. System administrators should upgrade to patched versions of Atomix that address the RaftContext variable term manipulation vulnerability. The implementation of strict access controls and authentication mechanisms for cluster nodes becomes essential to prevent unauthorized participation in consensus operations. Network segmentation and monitoring of cluster communication can help detect anomalous Raft protocol behavior that may indicate exploitation attempts. Additionally, organizations should implement comprehensive audit logging of leadership transitions and consensus operations to maintain visibility into cluster activities. The vulnerability aligns with CWE-284 Access Control Issues and may be classified under ATT&CK technique T1078 Valid Accounts, as it enables unauthorized nodes to assume legitimate cluster roles through protocol manipulation. Regular security assessments of distributed systems and implementation of principle of least privilege for cluster participants are recommended to prevent exploitation of similar consensus protocol vulnerabilities.