CVE-2014-5394 in Campus Switch
Summary
by MITRE
Multiple Huawei Campus switches allow remote attackers to enumerate usernames via vectors involving use of SSH by the maintenance terminal.
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Analysis
by VulDB Data Team • 01/20/2023
The vulnerability identified as CVE-2014-5394 affects multiple Huawei Campus switches and represents a significant security weakness in the device's authentication and access control mechanisms. This issue specifically impacts the Secure Shell implementation used by the maintenance terminal functionality, creating an avenue for remote attackers to conduct unauthorized username enumeration activities. The vulnerability stems from insufficient input validation and improper error handling within the SSH service implementation, allowing malicious actors to systematically discover valid usernames on the affected network devices. This type of vulnerability falls under the category of information disclosure, where attacker capabilities are expanded through the acquisition of sensitive system information that would otherwise remain hidden.
The technical flaw manifests in the SSH protocol implementation where the switch fails to properly handle authentication requests from remote attackers. When attempting to authenticate with various username combinations, the device provides different response behaviors that can be analyzed to determine which usernames are valid within the system. This differential response behavior creates a side-channel attack vector that enables attackers to perform systematic username enumeration through repeated authentication attempts. The vulnerability is particularly concerning because it operates at the network layer where the maintenance terminal service is exposed, making it accessible to anyone who can reach the device's SSH port without requiring any special privileges or prior access to the network.
From an operational impact perspective, this vulnerability significantly weakens the security posture of affected Huawei Campus switches by providing attackers with a method to gather intelligence about the system's user base. The ability to enumerate valid usernames creates a foundation for more sophisticated attacks including brute force authentication attempts, credential stuffing attacks, and social engineering operations. Attackers can leverage the discovered username information to target specific accounts with tailored attack strategies, potentially leading to unauthorized access to the device's maintenance terminal and full administrative control over the switch. The vulnerability affects network infrastructure devices that are often considered critical components of enterprise and campus networks, making the potential impact far-reaching and significant.
The mitigation strategies for CVE-2014-5394 should focus on implementing proper SSH configuration practices and network segmentation controls. Organizations should ensure that SSH access is restricted to authorized personnel only through proper network access controls and firewall rules. The implementation of account lockout mechanisms and rate limiting on authentication attempts can help prevent automated username enumeration attacks. Additionally, regular firmware updates and patches should be applied to address the underlying vulnerability in the SSH implementation. This vulnerability aligns with CWE-200, which addresses improper output handling and information exposure, and relates to ATT&CK technique T1078 for valid accounts and T1562 for credential manipulation. Network administrators should also consider implementing intrusion detection systems that can monitor for unusual authentication patterns and automated enumeration attempts that may indicate exploitation of this vulnerability.