CVE-2000-0107 in Linux
Summary
by MITRE
Linux apcd program allows local attackers to modify arbitrary files via a symlink attack.
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Analysis
by VulDB Data Team • 11/23/2024
The CVE-2000-0107 vulnerability resides within the Linux apcd program, a service designed to manage and control audio playback devices on Linux systems. This particular flaw represents a classic symlink attack vector that exploits improper handling of symbolic links during file operations. The vulnerability occurs when the apcd program creates or modifies files without adequately validating the symbolic link structure, allowing local attackers to manipulate the file system through carefully crafted symbolic link references.
The technical implementation of this vulnerability stems from insufficient input validation and improper file access controls within the apcd program's file handling routines. When the program processes file operations, it fails to properly resolve symbolic links before performing write operations, creating a race condition where an attacker can substitute a legitimate file with a symbolic link pointing to a target file of their choice. This flaw directly maps to CWE-59, which describes improper handling of symbolic links, and falls under the broader category of path traversal vulnerabilities. The vulnerability is particularly dangerous because it operates at the local privilege level, meaning any user with access to the system can exploit it to gain unauthorized access to sensitive files or directories.
The operational impact of CVE-2000-0107 extends beyond simple file modification, as it provides attackers with the capability to escalate privileges or corrupt system files. An attacker could potentially redirect file writes to critical system configuration files, log files, or even system binaries, leading to privilege escalation or system compromise. The vulnerability aligns with ATT&CK technique T1068, which covers the exploitation of local privileges, and demonstrates how seemingly benign services can become attack vectors when proper security controls are absent. In environments where apcd is running with elevated privileges, this vulnerability could enable attackers to modify system-critical files, potentially leading to complete system compromise.
Mitigation strategies for CVE-2000-0107 require immediate implementation of proper symbolic link handling within the apcd program. System administrators should ensure that the program properly resolves symbolic links before performing file operations and validates all file paths to prevent unauthorized access. The recommended approach involves implementing strict file access controls, using absolute paths instead of relative paths, and ensuring that file operations occur in secure temporary directories with appropriate permissions. Additionally, the system should be configured to run the apcd program with the minimum required privileges, following the principle of least privilege. Regular security audits should verify that no symbolic link vulnerabilities exist in other system services, as this represents a common pattern in Unix-like operating systems where improper file handling can create similar attack vectors. The vulnerability also highlights the importance of implementing proper input validation and secure coding practices, particularly in services that handle file operations, as outlined in secure coding guidelines such as those provided by the CERT Secure Coding Standards.