CVE-2020-24928 in PreMiD
Summary
by MITRE
managers/socketManager.ts in PreMiD through 2.1.3 has a locally hosted socketio web server (port 3020) open to all origins, which allows attackers to obtain sensitive Discord user information.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/30/2020
The vulnerability identified as CVE-2020-24928 affects PreMiD versions through 2.1.3 and represents a critical security flaw in the application's socket manager implementation. This issue manifests through the managers/socketManager.ts file which establishes a locally hosted socketio web server on port 3020. The server configuration fails to implement proper origin restrictions, creating an attack surface that exposes sensitive user data to unauthorized parties. The flaw exists within the application's design architecture where local network services are improperly configured to accept connections from any origin without authentication or authorization mechanisms.
The technical implementation of this vulnerability stems from inadequate security controls in the socketio server configuration. The server listens on port 3020 and accepts connections from all origins due to missing CORS (Cross-Origin Resource Sharing) restrictions and authentication requirements. This misconfiguration allows any local network attacker or malicious actor with access to the system to establish connections to the socketio server and potentially intercept or manipulate data transmitted through this interface. The vulnerability directly maps to CWE-668, which describes "Exposure of Resource to Wrong Sphere" where an application exposes a resource to the wrong trust zone. The flaw also aligns with CWE-284, "Improper Access Control," as the server lacks proper access restrictions that should prevent unauthorized access to sensitive information.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks. Attackers can leverage this open socket server to obtain sensitive Discord user information, which may include user identifiers, session data, or other personally identifiable information. The exposure of this data could facilitate further attacks such as session hijacking, credential theft, or social engineering campaigns. The vulnerability affects users who have PreMiD installed on their systems, making it particularly concerning for environments where multiple users share network resources or where security controls are minimal. The local nature of the attack vector means that exploitation requires either physical access to the device or network-level access within the same local network segment.
Mitigation strategies for this vulnerability should focus on implementing proper network segmentation and access controls. The immediate fix involves configuring the socketio server to restrict connections to specific origins or implement authentication mechanisms before allowing data transmission. Security professionals should ensure that the socket manager only accepts connections from localhost or specific authorized IP addresses. Network administrators should consider implementing firewall rules to block access to port 3020 from external networks and enforce proper access controls at the application level. The fix should also include implementing proper input validation and output encoding to prevent potential injection attacks that could exploit the open socket interface. Organizations should also conduct regular security assessments to identify similar vulnerabilities in other applications and services that may expose local network resources without proper access controls. This vulnerability highlights the importance of following security best practices such as the principle of least privilege and defense in depth as outlined in various security frameworks including NIST SP 800-53 and ISO/IEC 27001 standards.