CVE-2020-4273 in Spectrum Scale
Summary
by MITRE
IBM Spectrum Scale 4.2 and 5.0 could allow a local unprivileged attacker with intimate knowledge of the enviornment to execute commands as root using specially crafted input. IBM X-Force ID: 175977.
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Analysis
by VulDB Data Team • 05/13/2024
IBM Spectrum Scale represents a high-performance distributed file system that serves critical infrastructure needs across enterprise environments. The vulnerability CVE-2020-4273 specifically targets versions 4.2 and 5.0 of this software, creating a privilege escalation pathway that allows unprivileged local users to execute arbitrary commands with root privileges. This flaw stems from inadequate input validation mechanisms within the system's command processing pipeline, where specially crafted input can manipulate the execution flow to bypass standard security controls. The vulnerability requires an attacker to possess intimate knowledge of the environment, suggesting that successful exploitation depends on understanding specific system configurations and operational contexts that would typically be known only to authorized users or those with elevated access privileges.
The technical nature of this vulnerability aligns with CWE-78 and CWE-79, which address command injection and cross-site scripting respectively, though in this case the injection occurs within a local system context rather than network-facing interfaces. The flaw operates by exploiting the way the system processes user-supplied input during command execution, potentially allowing attackers to inject malicious commands that are then interpreted and executed with elevated privileges. This represents a classic privilege escalation vector where the attacker leverages existing system functionality to gain unauthorized access to root-level operations. The vulnerability's impact extends beyond simple command execution as it fundamentally undermines the principle of least privilege that governs secure system design.
The operational implications of this vulnerability are severe for organizations relying on IBM Spectrum Scale, as it provides a pathway for insider threats or compromised accounts to escalate privileges without requiring additional attack vectors. Once an attacker achieves root-level access through this vulnerability, they can modify system files, create backdoors, access sensitive data, and potentially compromise the entire distributed storage infrastructure. This threat is particularly concerning in environments where multiple users share the same system resources and where the assumption of trust exists between users and system administrators. The vulnerability effectively allows an attacker to bypass traditional security boundaries that should prevent unauthorized access to critical system functions and data.
Organizations should implement immediate mitigations including applying the vendor-provided patches and updates that address the input validation flaws in affected versions of IBM Spectrum Scale. System administrators should also conduct thorough environment assessments to identify potential attack vectors and ensure that only authorized users have access to systems running vulnerable versions of the software. Additional security controls such as mandatory access controls, privilege separation mechanisms, and enhanced monitoring of command execution should be implemented to detect and prevent exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how seemingly minor input validation issues can create significant security risks in enterprise storage systems. Organizations should also consider implementing the principle of least privilege more rigorously, ensuring that local users have only the minimum permissions required for their operational tasks, thereby reducing the potential impact of such privilege escalation vulnerabilities.