CVE-2002-2051 in ModLogAn
Summary
by MITRE
The processor_web plugin for ModLogAn 0.5.0 through 0.7.11, when used with the splitby option, allows local users to overwrite arbitrary files via a symlink attack on files specified as hostnames in a log file.
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Analysis
by VulDB Data Team • 07/08/2024
The vulnerability identified as CVE-2002-2051 resides within the processor_web plugin of ModLogAn versions 0.5.0 through 0.7.11, presenting a significant security risk through a symlink attack mechanism. This flaw specifically manifests when the plugin operates with the splitby option, creating a dangerous condition where local users can manipulate file operations to overwrite arbitrary files on the system. The vulnerability stems from inadequate file handling practices that fail to properly validate or sanitize symbolic link references during log processing operations.
The technical implementation of this vulnerability involves the processor_web plugin's handling of hostname specifications within log files when the splitby functionality is enabled. When ModLogAn processes log entries containing hostnames, it creates temporary files or directly references files based on these hostname values without proper verification of symbolic link status. Local attackers can exploit this by creating malicious symbolic links that point to sensitive system files, allowing them to overwrite critical files with arbitrary content during the log processing workflow. This represents a classic race condition vulnerability where the timing of file operations creates an exploitable window for privilege escalation or data corruption.
The operational impact of CVE-2002-2051 extends beyond simple file overwriting capabilities, potentially enabling attackers to compromise system integrity and availability. An attacker who successfully exploits this vulnerability can overwrite configuration files, system binaries, or critical log files, leading to service disruption, privilege escalation, or complete system compromise depending on the target files. The local nature of the attack means that any user with access to the system can potentially exploit this vulnerability, making it particularly dangerous in multi-user environments where less privileged accounts may exist. This vulnerability directly relates to CWE-59, which addresses improper handling of symbolic links, and aligns with ATT&CK technique T1059 for execution through command and scripting interpreters, as the exploitation typically involves manipulating file system references.
Mitigation strategies for this vulnerability should focus on immediate patching of affected ModLogAn versions, as well as implementing proper file validation mechanisms within the plugin. System administrators should ensure that the processor_web plugin is not run with elevated privileges when processing untrusted log data, and that proper file access controls are enforced. The recommended approach includes implementing proper file existence checks before file operations, avoiding symbolic link resolution during critical operations, and ensuring that temporary files are created with secure permissions. Additionally, monitoring for suspicious file overwrites and implementing proper log file validation can help detect exploitation attempts, while regular security audits of plugin configurations should be conducted to prevent similar vulnerabilities in other components of the logging infrastructure.