CVE-2020-13899 in janus-gateway
Summary
by MITRE
An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0. janus_process_incoming_request in janus.c discloses information from uninitialized stack memory.
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Analysis
by VulDB Data Team • 10/23/2020
The vulnerability identified as CVE-2020-13899 affects the janus-gateway WebRTC server implementation version 0.10.0 and earlier. This critical information disclosure flaw resides within the janus_process_incoming_request function located in the janus.c source file. The issue manifests when the server processes incoming requests, inadvertently exposing uninitialized memory contents to remote attackers who can potentially exploit this weakness to gain sensitive information about the system's internal state or memory layout.
This vulnerability represents a classic case of uninitialized memory exposure that falls under the CWE-457 category of use of uninitialized variables. The flaw occurs during the request processing lifecycle where the application fails to properly initialize memory variables before using them, creating potential information leakage pathways. The janus-gateway server, designed to facilitate real-time communication through WebRTC protocols, becomes susceptible to attackers who can craft specific requests to trigger this memory disclosure behavior.
The operational impact of CVE-2020-13899 extends beyond simple information leakage, as the disclosed memory contents may contain sensitive data such as cryptographic keys, session identifiers, or internal server state information. This exposure creates opportunities for attackers to perform further exploitation attempts, including but not limited to session hijacking, credential theft, or escalation of privileges within the WebRTC communication infrastructure. The vulnerability is particularly concerning in environments where janus-gateway serves as a core component of real-time communication systems, as it could compromise the confidentiality of ongoing communications and potentially provide attackers with insights into the server's operational environment.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1005 for data from local system and T1041 for data exfiltration through network communications. The attack surface is expanded by the fact that the information disclosure occurs during normal request processing, making detection more challenging and potentially allowing attackers to gather intelligence over time without immediate detection. Organizations utilizing janus-gateway should consider this vulnerability as part of their broader security posture assessment, particularly in environments where WebRTC services are exposed to untrusted networks or where sensitive communications are handled.
The recommended mitigations for CVE-2020-13899 include immediate upgrade to janus-gateway version 0.10.1 or later, where the memory initialization issue has been addressed. System administrators should also implement network segmentation and access controls to limit exposure of the janus-gateway service to trusted networks only. Additionally, monitoring and logging should be enhanced to detect unusual request patterns or potential exploitation attempts targeting this vulnerability, as the information disclosure may occur gradually over time rather than through a single exploitable event.