CVE-2019-19454 in Streaming Engine
Summary
by MITRE
An arbitrary file download was found in the "Download Log" functionality of Wowza Streaming Engine <= 4.x.x
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Analysis
by VulDB Data Team • 10/18/2020
The vulnerability identified as CVE-2019-19454 represents a critical security flaw within Wowza Streaming Engine versions 4.x.x that exposes the system to unauthorized file access through its Download Log functionality. This arbitrary file download vulnerability stems from insufficient input validation and access control mechanisms within the streaming engine's log retrieval system, allowing attackers to request and download sensitive files from the server's file system without proper authorization. The flaw exists in the way the application processes file download requests, failing to properly sanitize user-supplied parameters that specify which log files should be retrieved and delivered to the requesting client.
The technical implementation of this vulnerability enables an attacker to manipulate the file path parameter used in the Download Log functionality, potentially allowing access to files outside the intended directory structure. This type of flaw falls under the category of path traversal or directory traversal attacks, which are classified as CWE-22 in the Common Weakness Enumeration catalog. The vulnerability specifically impacts the application's authorization and authentication mechanisms, creating a scenario where legitimate administrative functions can be abused by unauthorized parties to extract confidential data including configuration files, log files, and potentially system credentials that may be stored within the application's file hierarchy. The absence of proper input sanitization and file path validation creates a direct pathway for attackers to navigate the file system and retrieve files that should remain protected within the server's restricted access zones.
Operationally, this vulnerability poses significant risks to organizations using Wowza Streaming Engine for media streaming services, as it could lead to exposure of sensitive operational data, including user credentials, system configurations, and potentially proprietary content metadata. Attackers could exploit this weakness to gain insights into the server's internal structure, identify other potential vulnerabilities, and potentially escalate their access to higher privileges within the system. The impact extends beyond simple data exfiltration, as the downloaded files might contain information that could be used to plan more sophisticated attacks or to understand the system's architecture for further exploitation. Organizations utilizing this streaming platform may experience compliance violations if sensitive data is compromised, particularly in regulated environments where data protection standards such as those outlined in the NIST Cybersecurity Framework are mandatory.
Mitigation strategies for CVE-2019-19454 should prioritize immediate patching of affected Wowza Streaming Engine versions to the latest available releases that address the arbitrary file download vulnerability. Organizations should implement robust input validation mechanisms to ensure all file path parameters are properly sanitized before processing, along with enforcing strict access controls and authentication checks for all log download functionality. Network segmentation and firewall rules should be configured to limit access to the streaming engine's administrative interfaces, while implementing proper monitoring and logging of file access activities to detect potential exploitation attempts. Additionally, regular security assessments should be conducted to identify and remediate similar vulnerabilities within the application's codebase, following security best practices such as those recommended in the OWASP Top Ten project and the MITRE ATT&CK framework for enterprise security. The vulnerability represents a clear violation of the principle of least privilege, where the application should only grant access to files that are explicitly authorized for download rather than allowing unrestricted traversal of the file system.