CVE-2017-16125 in rtcmulticonnection-client
Summary
by MITRE
rtcmulticonnection-client is a signaling implementation for RTCMultiConnection.js, a multi-session manager. rtcmulticonnection-client is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.
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Analysis
by VulDB Data Team • 02/16/2020
The vulnerability identified as CVE-2017-16125 affects rtcmulticonnection-client, a signaling component within the RTCMultiConnection.js framework that manages multiple real-time communication sessions. This client implementation serves as a bridge for establishing and managing WebRTC connections between peers in distributed applications. The flaw resides in how the client processes URL parameters during file system operations, creating a path traversal vulnerability that can be exploited by remote attackers.
The technical implementation of this vulnerability stems from inadequate input validation within the rtcmulticonnection-client component. When processing URL requests, the system fails to properly sanitize or validate path components that contain relative path references such as "../". This allows malicious actors to manipulate file system access by injecting directory traversal sequences into the URL parameters. The vulnerability specifically affects how the client handles file paths when resolving resource requests, enabling unauthorized access to files and directories outside the intended application scope.
The operational impact of this directory traversal vulnerability is significant for systems utilizing rtcmulticonnection-client, as it provides attackers with the ability to read arbitrary files from the server's file system. This could potentially expose sensitive configuration files, user data, application source code, or system files that should remain protected. The vulnerability essentially allows an attacker to bypass normal file system access controls and retrieve content that would typically be restricted to authorized users only. The risk is compounded in environments where the client component runs with elevated privileges or has access to sensitive data repositories.
Security practitioners should implement immediate mitigations including input validation and sanitization of all URL parameters before they are processed by the rtcmulticonnection-client component. The recommended approach involves implementing strict path validation that rejects or normalizes any path components containing directory traversal sequences. Organizations should also consider applying the principle of least privilege when configuring the client component, limiting its file system access to only necessary directories. Additionally, network-level firewalls and intrusion detection systems can be configured to monitor for suspicious URL patterns containing "../" sequences, providing an additional layer of defense against exploitation attempts.
This vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The ATT&CK framework categorizes this as a technique for privilege escalation and data access through path traversal methods. Organizations should also consider implementing web application firewalls that can detect and block such malicious path traversal attempts, as well as conducting regular security assessments to identify and remediate similar vulnerabilities in their WebRTC implementations and related signaling components.