CVE-2019-1620 in Data Center Network Manager
Summary
by MITRE
A vulnerability in the web-based management interface of Cisco Data Center Network Manager (DCNM) could allow an unauthenticated, remote attacker to upload arbitrary files on an affected device. The vulnerability is due to incorrect permission settings in affected DCNM software. An attacker could exploit this vulnerability by uploading specially crafted data to the affected device. A successful exploit could allow the attacker to write arbitrary files on the filesystem and execute code with root privileges on the affected device.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/25/2024
The vulnerability identified as CVE-2019-1620 resides within the web-based management interface of Cisco Data Center Network Manager, a critical component in enterprise network infrastructure management. This flaw represents a significant security weakness that undermines the integrity of the DCNM platform, which is designed to manage complex data center networks through its centralized web interface. The vulnerability specifically targets the permission controls implemented within the software, creating an exploitable condition that allows unauthorized access to system resources.
The technical implementation of this vulnerability stems from improper access control mechanisms within the DCNM software architecture. The flaw manifests as incorrect permission settings that fail to properly validate file upload operations, enabling attackers to bypass authentication requirements and submit malicious payloads directly to the affected system. This misconfiguration allows an unauthenticated remote attacker to manipulate the file system through crafted data submissions, effectively circumventing the security controls that should normally restrict such operations. The vulnerability operates at the application layer and leverages the web interface as its primary attack vector, making it particularly dangerous given the widespread use of web-based management tools.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as successful exploitation grants attackers complete control over the affected device with root privileges. This level of access enables attackers to write arbitrary files to the filesystem, potentially installing backdoors, modifying system binaries, or deploying additional malicious software. The ability to execute code with elevated privileges creates a persistent threat that can compromise the entire network infrastructure managed by DCNM, potentially affecting multiple network devices and systems. This vulnerability essentially transforms the affected DCNM appliance into a potential command and control node for broader network attacks.
Security professionals should recognize this vulnerability as a direct violation of the principle of least privilege, which is fundamental to secure system design and aligns with CWE-276, which addresses improper file permissions. The attack surface is particularly concerning given that the vulnerability can be exploited remotely without authentication, making it a prime target for automated exploitation tools. Organizations should consider this vulnerability in their threat modeling processes, as it represents a critical pathway for attackers to establish persistent access to network management systems. The ATT&CK framework would classify this as a privilege escalation technique, specifically involving the use of file system permissions to gain elevated access rights.
Mitigation strategies should focus on immediate patch deployment from Cisco, as well as network segmentation to limit access to the DCNM management interface. Organizations should implement additional monitoring of file upload activities and establish strict access controls for management interfaces. Regular security assessments of web-based management systems should include thorough review of permission settings and access controls to prevent similar vulnerabilities from emerging in the future. The remediation process must also include verification that all affected systems have been properly updated and that no unauthorized modifications have occurred during the vulnerability window.