CVE-2000-0218 in Linux
Summary
by MITRE
Buffer overflow in Linux mount and umount allows local users to gain root privileges via a long relative pathname.
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Analysis
by VulDB Data Team • 12/23/2024
The vulnerability described in CVE-2000-0218 represents a critical buffer overflow flaw affecting the Linux mount and umount utilities that enables local users to escalate their privileges to root level. This issue stems from inadequate input validation within the system call handling mechanisms of these essential filesystem management tools. The flaw specifically manifests when processing relative pathnames that exceed predetermined buffer limits, creating exploitable conditions that can be leveraged by malicious actors with local access to the system.
The technical implementation of this vulnerability resides in the way mount and umount functions handle pathname arguments without proper bounds checking. When a local user provides a relative pathname exceeding the allocated buffer space, the system overflows the stack or heap memory regions, potentially allowing execution of arbitrary code with elevated privileges. This type of vulnerability falls under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions that occur when insufficient bounds checking allows data to be written beyond the allocated buffer boundaries. The exploitation requires local system access and leverages the principle of privilege escalation through improper input handling within system utilities.
The operational impact of CVE-2000-0218 extends beyond simple privilege escalation as it represents a fundamental security weakness in core system utilities that form the foundation of Linux filesystem management. Attackers can exploit this vulnerability to gain root access on affected systems, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability affects systems running Linux kernel versions prior to the patch release that addressed this specific buffer overflow condition. Organizations with unpatched systems remain at risk of exploitation through local attackers who may have gained initial access through other means, such as compromised user accounts or network-based attacks that lead to local execution.
Mitigation strategies for this vulnerability primarily focus on immediate patching of affected systems to ensure the latest security updates are applied to the mount and umount utilities. System administrators should implement comprehensive vulnerability management processes to identify and remediate similar issues across all system components. Additionally, the principle of least privilege should be enforced through proper user account management and access controls to limit potential exploitation vectors. Security monitoring should include detection of unusual mount and umount activities that might indicate exploitation attempts. The vulnerability also highlights the importance of input validation and bounds checking in system-level utilities, aligning with security best practices outlined in the ATT&CK framework under privilege escalation techniques that leverage system call vulnerabilities. Organizations should conduct regular security assessments of core system utilities and implement proper code review processes to identify similar buffer overflow conditions that could be exploited for privilege escalation attacks.