CVE-2018-18566 in VVX 500
Summary
by MITRE
The SIP service in Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allow remote attackers to obtain sensitive phone configuration information by leveraging use with an on-premise installation with Skype for Business.
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Analysis
by VulDB Data Team • 04/06/2020
The vulnerability identified as CVE-2018-18566 affects Polycom VVX 500 and 601 video conferencing devices running firmware versions 5.8.0.12848 and earlier. This security flaw resides within the Session Initiation Protocol service that operates on these devices when integrated with on-premise Skype for Business installations. The issue represents a critical configuration exposure that undermines the security posture of enterprise communication infrastructures relying on these endpoints.
The technical flaw stems from insufficient authentication mechanisms within the SIP service implementation. Attackers can exploit this weakness to gain unauthorized access to sensitive phone configuration data without requiring valid credentials or prior system compromise. The vulnerability specifically manifests when the Polycom devices are deployed in on-premise environments with Skype for Business, indicating that the flaw is not present in cloud-based deployments or when different communication protocols are used. This targeted nature suggests the vulnerability is linked to how the device handles authentication requests within the Skype for Business integration framework.
The operational impact of this vulnerability is severe as it enables remote attackers to extract confidential information including phone configuration parameters, network settings, and potentially user credentials. Such exposure could facilitate further attacks within the corporate network, allowing threat actors to map the communication infrastructure and identify potential additional targets. The ability to obtain sensitive configuration data through a remote attack vector significantly increases the risk of lateral movement and persistent access within enterprise environments. Organizations utilizing these devices in their communication infrastructure face substantial risk of unauthorized access and potential data breaches.
Mitigation strategies should focus on immediate firmware updates to versions that address this vulnerability, as provided by Polycom security patches. Network segmentation and firewall rules should be implemented to restrict access to SIP ports and services to trusted network segments only. The principle of least privilege should be enforced by ensuring that only authorized personnel have access to the affected devices. Organizations should also conduct comprehensive network audits to identify all affected endpoints and implement monitoring solutions to detect anomalous access patterns. This vulnerability aligns with CWE-287 which addresses improper authentication issues, and represents a technique that could be categorized under ATT&CK tactic TA0006 (Credential Access) and technique T1212 (Exploitation for Credential Access). Regular security assessments and vulnerability scanning should be performed to identify similar configuration weaknesses in other networked devices and systems.