CVE-2004-1387 in HTTP Server
Summary
by MITRE
The check_forensic script in apache-utils package 1.3.31 allows local users to overwrite or create arbitrary files via a symlink attack on temporary files.
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Analysis
by VulDB Data Team • 07/16/2017
The vulnerability identified as CVE-2004-1387 resides within the apache-utils package version 1.3.31 and specifically targets the check_forensic script. This script is designed to perform forensic analysis on apache log files but contains a critical flaw that can be exploited by local users to manipulate the file system. The vulnerability stems from improper handling of temporary files during the script execution process, creating a predictable race condition that enables malicious file operations.
The technical flaw manifests through a symlink attack against temporary files created by the check_forensic script. When the script runs, it generates temporary files in a predictable location and with predictable naming conventions. Local attackers can exploit this by creating symbolic links with the same names as the expected temporary files before the script executes. This allows them to control what files the script attempts to write to or overwrite, potentially gaining unauthorized access to sensitive system resources or executing arbitrary code with elevated privileges.
This vulnerability operates under the broader category of insecure temporary file handling, which is classified as CWE-377 in the Common Weakness Enumeration catalog. The attack vector aligns with the ATT&CK technique T1059.007 for executing malicious code through scripts, and T1068 for privilege escalation through local system vulnerabilities. The flaw represents a classic race condition where the timing between file creation and access creates an exploitable window for attackers to manipulate the system's expected behavior.
The operational impact of this vulnerability extends beyond simple file manipulation, as it can lead to complete system compromise when attackers leverage the ability to overwrite critical system files or create malicious files that will be executed by the apache service or other system processes. Local users who can execute the check_forensic script can potentially escalate their privileges to root level access, depending on the execution context and permissions of the script. The vulnerability is particularly dangerous because it does not require network access or remote exploitation, making it an attractive target for attackers who have already gained local access to a system.
Mitigation strategies for CVE-2004-1387 primarily focus on addressing the root cause through secure temporary file handling practices. System administrators should immediately update to a patched version of the apache-utils package that properly handles temporary files using secure methods such as creating files with unique names and appropriate permissions. Additionally, implementing proper file access controls and using tools like setuid/setgid restrictions can help limit the potential damage from such attacks. The vulnerability highlights the importance of following secure coding practices for temporary file management and demonstrates how seemingly minor implementation flaws can create significant security risks. Organizations should also consider implementing monitoring and alerting mechanisms to detect suspicious file creation patterns that might indicate exploitation attempts.