CVE-2004-0581 in Mandrake Linux
Summary
by MITRE
ksymoops-gznm script in Mandrake Linux 9.1 through 10.0, and Corporate Server 2.1, allows local users to delete arbitrary files via a symlink attack on files in /tmp.
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Analysis
by VulDB Data Team • 04/23/2019
The vulnerability described in CVE-2004-0581 represents a critical local privilege escalation issue affecting Mandrake Linux versions 9.1 through 10.0 and Corporate Server 2.1. This flaw resides within the ksymoops-gznm script, which is part of the Linux kernel debugging and crash analysis utilities. The vulnerability stems from insecure temporary file handling practices that create opportunities for malicious local users to manipulate the system through symbolic link attacks. The ksymoops utility is designed to analyze kernel crash dumps and extract symbol information, but the script executing this functionality contains a dangerous race condition that allows attackers to replace legitimate files with malicious symbolic links.
The technical implementation of this vulnerability involves a classic symlink attack pattern where an attacker creates symbolic links in the /tmp directory before the vulnerable script processes them. When the ksymoops-gznm script executes, it creates temporary files in /tmp without proper validation of existing symbolic links, allowing the attacker to control which files are actually modified or deleted. This type of vulnerability is classified under CWE-377 as "Insecure Temporary File Creation" and falls under the broader category of CWE-378 as "Creation of Temporary File With Insecure Permissions." The flaw specifically demonstrates poor file handling security practices where the script does not properly check for and validate file ownership or permissions before operating on temporary files.
The operational impact of this vulnerability extends beyond simple file deletion capabilities, as it provides attackers with persistent means to manipulate system files and potentially escalate privileges. Local users who can execute the ksymoops-gznm script can leverage this weakness to target critical system files, configuration files, or even other users' files within the /tmp directory space. The attack vector is particularly concerning because it does not require elevated privileges initially, making it accessible to standard users who may have minimal system access. This vulnerability aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: Python" and T1074.001 for "Data Staged: Local Data Staging" when considering how attackers might exploit this to gain further system control.
Mitigation strategies for this vulnerability should focus on immediate system patching and implementation of proper file handling security measures. System administrators should ensure that all Mandrake Linux systems are updated to versions that address this specific vulnerability, as the original affected versions are now obsolete and unsupported. The recommended approach involves implementing proper file validation mechanisms in the ksymoops-gznm script, including checking for symbolic links before file operations and using secure temporary file creation methods. Additionally, organizations should consider implementing the principle of least privilege for script execution, ensuring that only authorized users can execute debugging utilities that handle temporary files. The solution also requires proper file permission management and monitoring of /tmp directory contents to detect potential symlink attacks. This vulnerability serves as a reminder of the importance of secure coding practices and proper temporary file handling in system utilities, particularly those with elevated privileges or system-level access requirements.