CVE-2018-6448 in Fabric OS
Summary
by MITRE
A vulnerability in the management interface in Brocade Fabric OS Versions before Brocade Fabric OS v9.0.0 could allow a remote attacker to perform a denial of service attack on the vulnerable host.
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Analysis
by VulDB Data Team • 11/14/2020
The vulnerability identified as CVE-2018-6448 resides within the management interface of Brocade Fabric OS versions prior to v9.0.0, representing a critical security flaw that exposes network infrastructure to remote exploitation. This issue specifically targets the fabric operating system used in enterprise storage area networks and data center environments where Brocade switches serve as critical components for connectivity and data transmission. The vulnerability stems from insufficient input validation and improper error handling mechanisms within the management interface, creating a pathway for malicious actors to disrupt normal operations without requiring elevated privileges or authentication credentials.
The technical implementation of this vulnerability involves a specific flaw in how the management interface processes incoming requests and handles error conditions. Attackers can craft specially formatted requests that trigger unexpected behavior in the system's response handling mechanisms, leading to resource exhaustion or process termination that results in denial of service conditions. This type of vulnerability aligns with CWE-20, which describes improper input validation, and CWE-400, which covers resource exhaustion conditions. The flaw essentially allows an unauthenticated remote attacker to send malformed requests that cause the system to enter an unstable state, potentially requiring manual intervention to restore normal operations.
From an operational impact perspective, the vulnerability presents significant risks to enterprise environments that depend on continuous network availability and data transmission capabilities. Organizations utilizing Brocade switches in their storage infrastructure face potential disruption of critical business operations, including data center outages, storage access failures, and service interruptions that can cascade across multiple systems. The remote nature of the attack means that threat actors can exploit this vulnerability from anywhere on the network without requiring physical access or legitimate credentials, making it particularly dangerous in environments where network segmentation is insufficient or where the management interface is accessible from untrusted networks.
The exploitation of this vulnerability typically involves sending crafted requests to the management interface ports, which may include HTTP or HTTPS endpoints depending on the specific configuration. Attackers can leverage this weakness to cause system instability through various techniques including sending malformed packets, triggering buffer overflows, or exhausting system resources through repeated request patterns. The impact extends beyond simple service disruption as the vulnerability can potentially affect the overall stability of the fabric switch, leading to extended downtime and requiring system restarts or manual recovery procedures that can take considerable time to complete.
Organizations should implement immediate mitigations including upgrading to Brocade Fabric OS version 9.0.0 or later, which contains the necessary patches to address the vulnerability. Network segmentation should be implemented to restrict access to management interfaces, ensuring that only authorized administrative systems can reach these critical endpoints. Additional protective measures include implementing firewall rules to limit access to management ports, enabling secure remote access protocols with strong authentication mechanisms, and monitoring network traffic for suspicious patterns that may indicate exploitation attempts. The vulnerability also highlights the importance of maintaining current firmware versions and implementing robust security practices including regular vulnerability assessments and penetration testing to identify and remediate similar issues before they can be exploited by malicious actors. This case demonstrates the critical importance of addressing vulnerabilities in network infrastructure components that serve as foundational elements for enterprise data center operations and storage connectivity.