CVE-2015-1427 in Elasticsearch
Summary
by MITRE
The Groovy scripting engine in Elasticsearch before 1.3.8 and 1.4.x before 1.4.3 allows remote attackers to bypass the sandbox protection mechanism and execute arbitrary shell commands via a crafted script.
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Analysis
by VulDB Data Team • 04/22/2026
The vulnerability identified as CVE-2015-1427 represents a critical security flaw in the Groovy scripting engine implementation within Elasticsearch versions prior to 1.3.8 and 1.4.x versions before 1.4.3. This vulnerability specifically targets the sandbox protection mechanisms that are designed to prevent unauthorized execution of potentially harmful code within the scripting environment. The issue stems from a fundamental weakness in how the Groovy engine handles script compilation and execution, allowing malicious actors to craft specially formatted scripts that can circumvent the intended security boundaries.
The technical exploitation of this vulnerability occurs through the manipulation of the Groovy scripting engine's sandbox protection system, which is intended to restrict access to system resources and prevent direct shell command execution. Attackers can construct malicious scripts that exploit implementation gaps in the sandbox mechanism, enabling them to execute arbitrary shell commands on the underlying operating system. This bypass occurs at the core level of script interpretation where the security boundaries are improperly enforced, allowing code execution that should be restricted to the scripting environment to escalate to full system command execution.
The operational impact of this vulnerability is severe and far-reaching, as it provides remote attackers with complete control over affected Elasticsearch instances. Once exploited, attackers can execute system commands with the privileges of the Elasticsearch process, potentially leading to complete system compromise, data exfiltration, or further lateral movement within the network infrastructure. The vulnerability affects organizations that rely on Elasticsearch for search and analytics services, particularly those with exposed Elasticsearch instances or those that have not properly secured their deployments against remote access.
This vulnerability aligns with CWE-250, which addresses "Execute Code with Unrestricted Privileges," and represents a direct violation of the principle of least privilege in software security design. From an ATT&CK framework perspective, this vulnerability maps to T1059.007 for "Command and Scripting Interpreter: PowerShell" and T1068 for "Exploitation for Privilege Escalation," demonstrating how a scripting engine vulnerability can enable attackers to escalate their privileges and execute system-level commands. Organizations should implement immediate mitigations including updating to patched versions of Elasticsearch, restricting network access to Elasticsearch instances, and implementing proper firewall rules to limit exposure to untrusted networks.
The remediation strategy should focus on upgrading to Elasticsearch versions 1.3.8 or 1.4.3 and later, which contain the necessary patches to address the sandbox bypass mechanism. Additionally, administrators should disable scripting capabilities if not required, implement proper access controls, and monitor for suspicious script execution patterns. The vulnerability underscores the critical importance of proper sandbox implementation in interpreted scripting environments and serves as a reminder that security boundaries must be rigorously enforced at all levels of software architecture. Organizations should conduct comprehensive security assessments of their Elasticsearch deployments and review their overall security posture to prevent similar vulnerabilities from being exploited in other components of their infrastructure.