CVE-2020-3402 in Unified Customer Voice Portal
Summary
by MITRE
A vulnerability in the Java Remote Method Invocation (RMI) interface of Cisco Unified Customer Voice Portal (CVP) could allow an unauthenticated, remote attacker to access sensitive information on an affected device. The vulnerability exists because certain RMI listeners are not properly authenticated. An attacker could exploit this vulnerability by sending a crafted request to the affected listener. A successful exploit could allow the attacker to access sensitive information on an affected device.
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Analysis
by VulDB Data Team • 10/28/2020
The vulnerability identified as CVE-2020-3402 resides within the Java Remote Method Invocation framework of Cisco Unified Customer Voice Portal, a critical component in enterprise communication infrastructure. This RMI interface serves as a gateway for remote method execution and data exchange, making it a prime target for malicious actors seeking unauthorized access to sensitive systems. The vulnerability represents a significant security weakness in the authentication mechanisms that protect the RMI endpoints, effectively creating an entry point for unauthenticated remote exploitation. Organizations utilizing Cisco CVP systems face heightened risk due to the nature of this flaw, which directly impacts the confidentiality and integrity of communication data processed through these platforms.
The technical flaw manifests through improper authentication mechanisms within the RMI listeners that operate on the affected Cisco CVP devices. In standard RMI implementations, secure communication channels require proper authentication protocols to validate client identities before granting access to remote methods or data services. However, in this vulnerability, the RMI listeners fail to enforce adequate authentication checks, allowing any remote attacker to establish connections without proper credentials. The flaw specifically affects the Java RMI interface where sensitive information can be accessed through crafted requests sent to the vulnerable listener endpoints. This represents a classic authentication bypass vulnerability that falls under the CWE-287 category, which addresses improper authentication issues in software systems.
The operational impact of CVE-2020-3402 extends beyond simple information disclosure, potentially enabling attackers to gain unauthorized access to critical customer communication data and system configurations. Attackers exploiting this vulnerability can remotely retrieve sensitive information including customer voice data, call routing information, and potentially system credentials that could facilitate further compromise of the network infrastructure. The remote nature of the exploit eliminates the need for physical access or insider knowledge, making the attack vector particularly dangerous for enterprise environments. This vulnerability directly affects the principle of least privilege and can lead to privilege escalation scenarios where attackers gain elevated access to system resources that should remain protected. The attack surface is broad given that RMI interfaces are commonly exposed to external networks for legitimate business purposes, increasing the likelihood of successful exploitation.
Organizations should implement immediate mitigations including disabling unnecessary RMI interfaces on affected Cisco CVP systems, applying the latest security patches provided by Cisco, and implementing network segmentation to limit access to these vulnerable services. Network administrators should consider implementing firewall rules that restrict access to RMI ports and establish monitoring protocols to detect anomalous RMI traffic patterns. The vulnerability aligns with ATT&CK technique T1071.004 which covers application layer protocol usage for command and control communications, highlighting the need for comprehensive network monitoring solutions. Additional protective measures include regular security assessments of Java-based applications, implementation of secure coding practices for RMI interfaces, and maintaining updated threat intelligence feeds to identify potential exploitation attempts. Organizations should also consider conducting penetration testing to validate the effectiveness of implemented security controls and ensure complete remediation of the vulnerability across their network infrastructure.