CVE-2017-14329 in EXOS
Summary
by MITRE
Extreme EXOS 16.x, 21.x, and 22.x allows administrators to obtain a root shell via vectors involving an exsh debug shell.
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Analysis
by VulDB Data Team • 11/30/2019
The vulnerability identified as CVE-2017-14329 represents a critical security flaw in Extreme Networks EXOS operating systems versions 16.x, 21.x, and 22.x that enables unauthorized administrative access through a debug shell mechanism. This vulnerability specifically targets the exsh debug shell functionality, which is designed for diagnostic purposes but has been improperly configured to allow privilege escalation. The flaw exists within the command execution and access control mechanisms of the EXOS operating system, creating a pathway for attackers to bypass normal authentication procedures and gain root-level privileges on affected devices.
The technical implementation of this vulnerability stems from insufficient input validation and privilege separation within the exsh debug shell component. When administrators attempt to access the debug shell, the system fails to properly enforce access controls, allowing malicious actors to exploit this functionality to execute commands with elevated privileges. This issue manifests as a privilege escalation vulnerability that operates at the system level, effectively undermining the security model of the network device. The vulnerability is particularly concerning because it operates through legitimate administrative channels that are normally restricted to authorized personnel only, making detection more challenging.
The operational impact of CVE-2017-14329 extends beyond simple unauthorized access, as it provides attackers with complete control over affected network infrastructure. Once an attacker gains root shell access through this vulnerability, they can modify system configurations, install malicious software, monitor network traffic, and potentially use the compromised device as a pivot point for attacking other systems within the network. This vulnerability directly impacts network availability, integrity, and confidentiality, as it allows for persistent access that can remain undetected for extended periods. The affected devices typically serve as core network infrastructure components, making the potential damage from exploitation significant.
Organizations should implement immediate mitigations including applying the latest security patches provided by Extreme Networks, disabling debug shell functionality where possible, and implementing network segmentation to limit the impact of potential compromise. The vulnerability aligns with CWE-284, which addresses improper access control, and relates to ATT&CK technique T1068, which covers local privilege escalation. Security monitoring should focus on unusual debug shell access patterns, unauthorized command execution, and unexpected root-level activity on network devices. Additionally, implementing robust network access controls, regular security audits, and privilege management policies can significantly reduce the risk associated with this vulnerability. The remediation process should include comprehensive testing to ensure that the patch does not disrupt critical network operations while maintaining the security posture of the entire infrastructure.