CVE-2023-43066 in Unity
Summary
by MITRE • 10/25/2023
Dell Unity prior to 5.3 contains a Restricted Shell Bypass vulnerability. This could allow an authenticated, local attacker to exploit this vulnerability by authenticating to the device CLI and issuing certain commands.
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Analysis
by VulDB Data Team • 11/15/2023
The vulnerability identified as CVE-2023-43066 affects Dell Unity storage systems running software versions prior to 5.3, representing a critical Restricted Shell Bypass flaw that undermines the security posture of these enterprise storage devices. This vulnerability resides within the command-line interface implementation and specifically targets the authentication and authorization mechanisms that govern user access to system commands. The flaw allows an authenticated local attacker to escalate their privileges and execute arbitrary commands beyond their intended scope, effectively bypassing the intended shell restrictions that should limit user capabilities within the system's command interface.
The technical exploitation of this vulnerability occurs through the manipulation of command execution flows within the Dell Unity device's CLI environment. When an attacker successfully authenticates to the system's command-line interface, they can leverage specific command sequences or syntax patterns that circumvent the normal shell restrictions imposed by the system's security model. This bypass mechanism operates at the kernel or shell level where proper input validation and command filtering fail to prevent unauthorized access to privileged operations. The vulnerability essentially allows attackers to execute commands that should be restricted to administrative users or system processes, effectively elevating their privileges within the storage environment.
From an operational impact perspective, this vulnerability presents a significant risk to enterprise storage infrastructure as it enables local attackers with legitimate credentials to gain elevated privileges and potentially compromise the entire storage system. The implications extend beyond simple privilege escalation since storage systems often contain sensitive organizational data and serve as critical infrastructure components. Attackers could leverage this vulnerability to modify storage configurations, access protected data, disrupt services, or establish persistent access points within the network. The local nature of the attack means that an attacker must first obtain valid credentials, but this represents a reasonable threat vector given that many storage administrators maintain accounts with elevated privileges.
The vulnerability aligns with CWE-284, which addresses improper access control, and demonstrates characteristics consistent with privilege escalation flaws within command-line interfaces. From an adversarial perspective, this vulnerability maps to several ATT&CK tactics including privilege escalation and command and control, where attackers can use the bypass to execute malicious payloads or establish persistence mechanisms. The security implications are particularly concerning for organizations that rely on Dell Unity systems for critical data storage operations, as these systems often serve as foundational elements of enterprise data infrastructure. Organizations should consider this vulnerability as part of broader security assessments that include network segmentation, privileged access management, and comprehensive monitoring of command-line activities.
Mitigation strategies for CVE-2023-43066 should prioritize immediate software updates to Dell Unity systems running version 5.3 or later, as Dell has released patches specifically addressing this vulnerability. Organizations should implement strict access controls for CLI access, including mandatory use of multi-factor authentication and role-based access restrictions. Network segmentation should be enforced to limit local access points to storage systems, and comprehensive monitoring of CLI activities should be deployed to detect anomalous command execution patterns. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in storage infrastructure components. The remediation process should include thorough testing of patches in controlled environments before deployment to production systems to ensure operational stability and prevent unintended service disruptions.