CVE-2003-0983 in Unity
Summary
by MITRE
Cisco Unity on IBM servers is shipped with default settings that should have been disabled by the manufacturer, which allows local or remote attackers to conduct unauthorized activities via (1) a "bubba" local user account, (2) an open TCP port 34571, or (3) when a local DHCP server is unavailable, a DHCP server on the manufacturer s test network.
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Analysis
by VulDB Data Team • 07/16/2019
The vulnerability identified as CVE-2003-0983 affects Cisco Unity systems deployed on IBM servers, representing a critical configuration flaw that exposes multiple attack vectors for unauthorized access. This issue stems from the default installation settings that fail to properly secure the system, creating persistent security weaknesses that can be exploited by both local and remote adversaries. The vulnerability specifically targets the Cisco Unity collaboration platform, which is designed for unified messaging and voice mail services, making it a potentially attractive target for attackers seeking to compromise enterprise communication infrastructure.
The technical flaw manifests through three distinct but interconnected attack vectors that collectively create a comprehensive exploitation pathway. First, the system ships with a "bubba" local user account that remains active and accessible without proper authentication requirements, providing attackers with a readily available foothold for system access. Second, TCP port 34571 remains open and unsecured, creating a network-based attack surface that allows remote exploitation without requiring prior authentication. Third, the system lacks proper failover mechanisms for DHCP configuration, meaning that when a local DHCP server becomes unavailable, the system defaults to using a manufacturer test network DHCP server, which can be manipulated to redirect traffic or provide malicious network configuration.
This vulnerability has significant operational impact on enterprise environments as it allows attackers to establish persistent access to critical communication systems without requiring advanced exploitation techniques or specialized tools. The combination of these three vectors creates a multi-layered attack approach that can be executed with minimal technical expertise, making the vulnerability particularly dangerous for organizations that do not perform proper security hardening during deployment. The presence of default credentials and open network ports essentially provides attackers with a complete toolkit for unauthorized system access and manipulation.
The security implications extend beyond simple unauthorized access to include potential data exfiltration, system compromise, and disruption of critical business communications. Organizations using Cisco Unity systems are particularly vulnerable because these platforms often serve as central communication hubs for enterprise networks, making them attractive targets for attackers seeking to gain broader network access or establish persistent presence within the organization. This vulnerability directly relates to CWE-798, which addresses the use of hardcoded credentials, and CWE-668, which covers the exposure of a resource to the wrong sphere, as the system exposes network services and accounts to unauthorized access.
Mitigation strategies must address all three identified attack vectors through comprehensive security hardening procedures. Organizations should immediately disable or remove the "bubba" user account and implement strong authentication policies for all remaining accounts. Network security controls must be implemented to close TCP port 34571 and restrict access to authorized personnel only. Additionally, DHCP configuration should be properly managed to prevent fallback to manufacturer test networks, requiring organizations to implement proper network infrastructure controls and monitoring. The remediation process should align with ATT&CK technique T1078 for valid accounts and T1046 for network service discovery, ensuring that all access points are properly secured and monitored for unauthorized activity. Regular security assessments and configuration audits should be conducted to prevent similar issues from reoccurring in future deployments.