CVE-2017-3815 in TelePresence Server
Summary
by MITRE
An API Privilege vulnerability in Cisco TelePresence Server Software could allow an unauthenticated, remote attacker to emulate Cisco TelePresence Server endpoints. Affected Products: This vulnerability affects Cisco TelePresence Server MSE 8710 Processors that are running a software release prior to Cisco TelePresence Software Release 4.3 and are running in locally managed mode. The vulnerable API was deprecated in Cisco TelePresence Software Release 4.3. More Information: CSCvc37616.
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Analysis
by VulDB Data Team • 12/25/2024
The vulnerability described in CVE-2017-3815 represents a critical API privilege escalation issue within Cisco TelePresence Server Software that fundamentally compromises the security posture of affected systems. This weakness exists in the Cisco TelePresence Server MSE 8710 Processors operating in locally managed mode, where the system fails to properly authenticate and authorize API requests, creating an avenue for unauthorized remote access. The vulnerability specifically targets the deprecated API functionality that was intended to be removed in software release 4.3, yet remained accessible in earlier versions, creating a persistent security gap that attackers could exploit to gain unauthorized control over the system. The implications of this flaw extend beyond simple privilege escalation, as it enables full emulation of legitimate TelePresence endpoints, essentially allowing an attacker to masquerade as authorized devices within the network infrastructure.
The technical exploitation of this vulnerability occurs through an unauthenticated remote attack vector that does not require any prior credentials or access rights to initiate. Attackers can leverage the exposed API endpoint to perform operations that should only be accessible to authenticated administrators or system components, effectively bypassing the normal authentication mechanisms that protect the TelePresence server. This flaw operates at the application layer, specifically targeting the server's API interface that handles endpoint management and communication protocols. The vulnerability falls under CWE-284, which classifies it as an "Improper Access Control" issue, where the system fails to properly enforce access restrictions on privileged functions. The attack surface is particularly concerning because it enables the attacker to not only access system resources but also to manipulate the endpoint behavior, potentially disrupting communications or gaining further access to connected network segments.
The operational impact of this vulnerability extends beyond immediate unauthorized access, creating a comprehensive security risk that affects the integrity and availability of the entire TelePresence ecosystem. An attacker who successfully exploits this vulnerability can effectively take control of the TelePresence server, manipulate call routing, intercept communications, and potentially use the compromised system as a pivot point to attack other network components. The locally managed mode configuration exacerbates the risk, as these systems typically operate with fewer security controls compared to centrally managed deployments, making them more attractive targets for exploitation. The ability to emulate endpoints means that an attacker could potentially impersonate legitimate TelePresence devices, making detection more difficult and allowing for extended periods of unauthorized activity without immediate detection. This vulnerability directly aligns with ATT&CK technique T1078, which covers "Valid Accounts" and "Unnamed Accounts" where adversaries use legitimate credentials or create fake endpoints to maintain access.
Organizations affected by CVE-2017-3815 must implement immediate remediation measures including upgrading to Cisco TelePresence Software Release 4.3 or later, which properly deprecates the vulnerable API functionality. Network segmentation and monitoring should be enhanced to detect anomalous endpoint behavior that might indicate emulation activities. The vulnerability also highlights the importance of proper software lifecycle management, as deprecated APIs that remain active in production environments create persistent security risks. Additional mitigations include implementing network access controls to restrict API access to trusted sources only, enabling comprehensive logging of API activities for forensic analysis, and conducting regular vulnerability assessments to identify similar deprecated components that may pose risks. Security teams should also consider the broader implications of endpoint emulation capabilities and ensure that their incident response procedures account for potential manipulation of TelePresence systems. The vulnerability serves as a reminder that legacy system components, even when deprecated, can remain dangerous if not properly removed from production environments, emphasizing the critical need for comprehensive security audits and proper software maintenance practices.