CVE-2018-15598 in Traefik
Summary
by MITRE
Containous Traefik 1.6.x before 1.6.6, when --api is used, exposes the configuration and secret if authentication is missing and the API's port is publicly reachable.
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Analysis
by VulDB Data Team • 05/04/2023
The vulnerability identified as CVE-2018-15598 affects Containous Traefik versions 1.6.x prior to 1.6.6, representing a critical security flaw in the reverse proxy and load balancer software widely used in containerized environments. This vulnerability specifically manifests when the Traefik API functionality is enabled through the --api flag, creating a significant exposure risk for systems that do not properly secure this interface. The flaw arises from insufficient authentication mechanisms that allow unauthorized access to sensitive configuration data and cryptographic secrets when the API endpoint is accessible from external networks.
The technical implementation of this vulnerability stems from Traefik's default behavior of exposing its API interface without requiring authentication by default. When administrators enable the API feature for monitoring and management purposes, they inadvertently create a potential attack vector if the API port is not properly restricted or secured. The configuration endpoints exposed by the API contain detailed information about the proxy's internal setup, including backend service configurations, routing rules, and most critically, secret credentials and authentication tokens that could be used to escalate privileges or gain unauthorized access to the underlying infrastructure. This misconfiguration creates a direct pathway for attackers to extract sensitive information that could compromise the entire system.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposed secrets and configurations can enable attackers to perform lateral movement within the network infrastructure. The exposure of authentication tokens and credential information allows adversaries to potentially access other systems that rely on the same authentication mechanisms, while the configuration data provides detailed insights into the internal network topology and service dependencies. This information can be leveraged to plan more sophisticated attacks, including privilege escalation, service disruption, or even complete system compromise. The vulnerability is particularly dangerous in containerized environments where Traefik often serves as a critical ingress point for traffic, making it a prime target for attackers seeking to establish persistent access to cloud-native architectures.
Organizations should immediately implement mitigation strategies that include restricting API port access to trusted networks only, implementing proper authentication mechanisms, and ensuring that the --api flag is not exposed to public networks without adequate security controls. The recommended solution involves configuring firewall rules to limit access to the API port, enabling basic authentication for the API endpoint, or completely disabling the API feature when not required for operational purposes. According to CWE standards, this vulnerability maps to CWE-284 Access Control, which addresses insufficient access control mechanisms, while the ATT&CK framework would classify this under T1078 Valid Accounts and T1566 Phishing, as attackers could use the exposed credentials to establish persistent access and potentially deliver additional malware through compromised systems. The vulnerability also aligns with NIST SP 800-53 security controls related to access control and system and information integrity, emphasizing the need for proper network segmentation and authentication enforcement.