CVE-2015-5378 in Logstash
Summary
by MITRE
Logstash 1.5.x before 1.5.3 and 1.4.x before 1.4.4 allows remote attackers to read communications between Logstash Forwarder agent and Logstash server.
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Analysis
by VulDB Data Team • 12/09/2022
The vulnerability identified as CVE-2015-5378 represents a critical security flaw in the Logstash logging platform that affected versions prior to 1.5.3 and 1.4.4. This issue specifically targets the communication channels between Logstash Forwarder agents and Logstash servers, creating a significant risk for organizations relying on these components for log aggregation and processing. The vulnerability stems from insufficient encryption and authentication mechanisms within the communication protocol, allowing remote attackers to intercept and read sensitive data transmitted between these systems.
The technical flaw manifests in the improper handling of network communications where Logstash Forwarder agents send log data to Logstash servers without adequate cryptographic protection. This weakness enables attackers to perform man-in-the-middle attacks by capturing network traffic and extracting plaintext log messages, configuration data, and potentially sensitive information such as user credentials, system identifiers, or application-specific data. The vulnerability operates at the transport layer of the communication stack, exploiting the absence of strong encryption protocols and mutual authentication mechanisms that should normally secure these connections.
The operational impact of this vulnerability extends beyond simple data exposure, as it fundamentally compromises the integrity and confidentiality of log data flowing through the system. Organizations utilizing affected Logstash versions face risks including unauthorized access to operational logs, potential exposure of sensitive system information, and possible exploitation of gathered intelligence for further attacks. The vulnerability particularly affects environments where security is paramount, such as financial institutions, healthcare organizations, and government agencies that rely on comprehensive logging for compliance and security monitoring purposes. Attackers could leverage this weakness to gain insights into system configurations, user activities, and potential security gaps within the organization's infrastructure.
Mitigation strategies for CVE-2015-5378 primarily involve immediate upgrading to patched versions of Logstash 1.5.3 or 1.4.4, which implement proper encryption and authentication mechanisms. Organizations should also consider implementing network segmentation, deploying intrusion detection systems, and establishing monitoring for unusual network traffic patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-310, which addresses cryptographic weaknesses in communication protocols, and maps to ATT&CK technique T1071.004 for application layer protocol usage, specifically targeting the communication channels used by logging systems. Additional defensive measures include enforcing network-level encryption through SSL/TLS protocols, implementing proper certificate management, and establishing robust network monitoring to detect and prevent unauthorized access to log data transmission channels.