CVE-2019-6512 in API Manager
Summary
by MITRE
An issue was discovered in WSO2 API Manager 2.6.0. It is possible to force the application to perform requests to the internal workstation (SSRF port-scanning), other adjacent workstations (SSRF network scanning), or to enumerate files because of the existence of the file:// wrapper.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/30/2025
The vulnerability identified as CVE-2019-6512 affects WSO2 API Manager version 2.6.0 and represents a critical server-side request forgery flaw that enables attackers to bypass normal access controls and access internal network resources. This vulnerability stems from insufficient input validation within the application's request processing logic, specifically when handling file protocol requests. The issue allows malicious actors to construct requests that leverage the file:// wrapper to access local files and perform network scanning operations against internal systems that would normally be protected by network segmentation.
This vulnerability operates at the intersection of several security domains including access control bypass, information disclosure, and network reconnaissance. The core technical flaw lies in the application's improper handling of URI schemes, particularly the file:// protocol which should be strictly controlled and validated. When the application processes requests containing file:// wrappers, it fails to properly sanitize or restrict the paths that can be accessed, enabling attackers to traverse the file system and potentially access sensitive configuration files, credentials, or other internal resources. The vulnerability is categorized under CWE-918 as "Server-Side Request Forgery" and aligns with ATT&CK technique T1105 which covers "Command and Scripting Interpreter" through the exploitation of server-side vulnerabilities.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with the capability to perform comprehensive internal network reconnaissance through port scanning and service enumeration. Attackers can leverage the SSRF vulnerability to scan internal network ports, identify running services, and potentially discover other vulnerable systems within the same network segment. Additionally, the ability to enumerate local files through the file:// wrapper can lead to credential exposure, configuration file disclosure, and access to sensitive data that should remain isolated from external access. The vulnerability effectively transforms the WSO2 API Manager into a potential reconnaissance tool for attackers already within the network perimeter.
Mitigation strategies for CVE-2019-6512 should focus on implementing strict input validation and URI scheme restrictions within the application's request processing pipeline. Organizations should immediately upgrade to WSO2 API Manager versions that have patched this vulnerability, as the vendor has released security updates addressing this specific flaw. Network segmentation and firewall rules should be implemented to restrict access to internal services from the API Manager, while implementing proper access controls to prevent unauthorized file system access. Additionally, organizations should deploy web application firewalls and implement monitoring for suspicious URI patterns that may indicate exploitation attempts. The solution should also include regular security assessments and input validation testing to prevent similar vulnerabilities from being introduced in future development cycles, aligning with the principles of secure coding practices and defense in depth strategies.