CVE-2000-0171 in atsar
Summary
by MITRE
atsadc in the atsar package for Linux does not properly check the permissions of an output file, which allows local users to gain root privileges.
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Analysis
by VulDB Data Team • 11/16/2024
The vulnerability identified as CVE-2000-0171 resides within the atsar package for Linux systems, specifically affecting the atsadc component. This flaw represents a classic privilege escalation vulnerability that exploits improper file permission handling within a system utility. The atsar package is designed to collect and analyze system performance data, with atsadc serving as a daemon responsible for processing this information and writing output to designated files. The core issue manifests when the atsadc process fails to validate the permissions of output files before writing to them, creating a potential security breach that could be exploited by local attackers.
This vulnerability operates through a privilege escalation mechanism where a local user can manipulate the file creation process to gain elevated privileges. The technical flaw stems from inadequate input validation and permission checking within the atsadc daemon, allowing attackers to create or overwrite files with root privileges. When the daemon processes system data and attempts to write output to files, it does not properly verify whether the target file already exists or whether the user has appropriate permissions to modify it. This oversight creates a race condition scenario where malicious users can pre-create symbolic links or manipulate file paths to redirect the daemon's output to locations they control, ultimately enabling them to execute arbitrary code with root privileges.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises system integrity and can lead to complete system compromise. Attackers exploiting this vulnerability can potentially modify critical system files, install backdoors, or manipulate system logs to cover their tracks. The vulnerability affects systems where the atsar package is installed and where local users have access to execute the atsadc utility. Given that atsar is commonly used for system monitoring and performance analysis, this vulnerability could be present on numerous production systems, making it particularly dangerous as it may go unnoticed for extended periods. The impact is further amplified by the fact that local privilege escalation vulnerabilities are often difficult to detect and can be leveraged as a foothold for more extensive attacks.
Mitigation strategies for CVE-2000-0171 should focus on immediate patching and system hardening measures. The most effective solution involves applying the appropriate security patches provided by the operating system vendors or the atsar package maintainers to address the permission checking flaw. System administrators should also implement proper file permission controls and ensure that the atsar package is properly configured with minimal required privileges. Additionally, monitoring for unauthorized file modifications and implementing intrusion detection systems can help identify exploitation attempts. The vulnerability aligns with CWE-276, which describes improper file permissions, and represents a classic example of privilege escalation through inadequate access control mechanisms. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be used as a persistence mechanism once initial access is gained, potentially enabling attackers to maintain long-term control over affected systems. Regular security audits and vulnerability assessments should be conducted to identify similar permission-related flaws in other system components and ensure comprehensive system security posture maintenance.