CVE-2000-0186 in Linux
Summary
by MITRE
Buffer overflow in the dump utility in the Linux ext2fs backup package allows local users to gain privileges via a long command line argument.
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Analysis
by VulDB Data Team • 04/20/2026
The vulnerability identified as CVE-2000-0186 represents a critical buffer overflow flaw within the dump utility of the Linux ext2fs backup package. This issue resides in the command line argument processing mechanism where the utility fails to properly validate input length before copying arguments into fixed-size buffers. The flaw specifically affects the dump utility which is responsible for creating backups of ext2 filesystems, making it a significant concern for system administrators who rely on this tool for data protection. The vulnerability is classified as a local privilege escalation vector, meaning that an attacker must already have access to the system but can leverage this flaw to elevate their privileges to root level access.
The technical implementation of this buffer overflow occurs when the dump utility processes command line arguments without adequate bounds checking. When a local user provides an excessively long command line argument, the utility's internal buffer cannot accommodate the input data, causing adjacent memory locations to be overwritten. This memory corruption typically affects the stack frame of the executing process, potentially allowing an attacker to manipulate return addresses and execute arbitrary code with elevated privileges. The vulnerability stems from improper input validation and insufficient buffer size management within the utility's argument parsing routines, creating a classic stack-based buffer overflow scenario that aligns with CWE-121. The flaw demonstrates a lack of proper bounds checking mechanisms that should be implemented according to secure coding practices outlined in various cybersecurity frameworks.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a means to gain unauthorized root access on systems running vulnerable versions of the ext2fs backup utilities. This capability allows threat actors to completely compromise system integrity, potentially leading to data theft, system modification, or further network infiltration. The vulnerability affects systems where the dump utility is commonly used for backup operations, particularly those running older versions of Linux distributions that include the affected ext2fs package. Given that the dump utility is a standard component in many Linux installations and is frequently used for system administration tasks, the potential attack surface is significant. The vulnerability also has implications for automated backup systems and enterprise environments where backup operations are critical components of data protection strategies.
Mitigation strategies for CVE-2000-0186 should prioritize immediate patching of affected systems with updated versions of the ext2fs package that include proper input validation and buffer size controls. System administrators should conduct comprehensive inventory checks to identify all systems running vulnerable versions of the dump utility and implement patch management procedures to address the issue promptly. Additional protective measures include restricting user access to the dump utility where possible, implementing proper input validation at the application level, and monitoring system logs for suspicious command line usage patterns. Organizations should also consider implementing privilege separation mechanisms and regular security audits to identify similar vulnerabilities in other system utilities. The remediation efforts should align with industry best practices for buffer overflow prevention and follow the principles of secure coding standards that address CWE-121 and related vulnerabilities. Furthermore, implementing proper system hardening techniques and following the ATT&CK framework's recommendations for privilege escalation techniques can help prevent exploitation of similar vulnerabilities in the future.