CVE-2004-0457 in MySQL
Summary
by MITRE
The mysqlhotcopy script in mysql 4.0.20 and earlier, when using the scp method from the mysql-server package, allows local users to overwrite arbitrary files via a symlink attack on temporary files.
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Analysis
by VulDB Data Team • 07/12/2025
The mysqlhotcopy script in mysql versions 4.0.20 and earlier contains a critical security flaw that enables local users to perform arbitrary file overwrite operations through a symlink attack on temporary files. This vulnerability specifically manifests when the script employs the scp method for data transfer, creating a dangerous condition where malicious users can manipulate the filesystem to overwrite files outside the intended scope of the backup operation. The flaw stems from inadequate handling of temporary file creation and symbolic link resolution within the script's execution environment.
This vulnerability represents a classic path traversal and privilege escalation issue that aligns with CWE-59 and CWE-22 categories, where the system fails to properly validate file paths and symbolic link references. The attack vector exploits the predictable naming patterns of temporary files created during the backup process, allowing attackers to establish symbolic links that redirect file operations to sensitive system locations. The issue is particularly concerning because it operates at the local user level, meaning any user with access to the system can potentially exploit this weakness to overwrite critical files with malicious content.
The operational impact of this vulnerability extends beyond simple file overwrites to potentially enable more sophisticated attacks including privilege escalation, service disruption, and data corruption. Attackers can leverage this flaw to overwrite system configuration files, binary executables, or critical database files, potentially leading to complete system compromise. The vulnerability affects the integrity and availability of the mysql database system and can result in unauthorized access to database contents, modification of backup files, or disruption of database operations. Organizations using affected mysql versions face significant risk of data integrity breaches and potential system compromise through this attack vector.
Mitigation strategies for this vulnerability include immediate patching of mysql to versions 4.0.21 or later where the issue has been resolved through improved temporary file handling and symbolic link validation. System administrators should also implement restrictive file permissions on the mysqlhotcopy script and related directories to limit local user access to critical system areas. The use of alternative backup methods that do not rely on scp or symbolic link operations should be considered as temporary workarounds. Additionally, monitoring for suspicious file creation patterns and implementing proper file system auditing can help detect exploitation attempts. Organizations should also consider implementing the principle of least privilege and regularly reviewing access controls to minimize the potential impact of such local privilege escalation vulnerabilities. This vulnerability demonstrates the importance of proper temporary file handling in database administration tools and aligns with ATT&CK technique T1059 for execution and T1068 for local privilege escalation.