CVE-2000-0873 in AIX
Summary
by MITRE
netstat in AIX 4.x.x does not properly restrict access to the -Zi option, which allows local users to clear network interface statistics and possibly hide evidence of unusual network activities.
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Analysis
by VulDB Data Team • 06/05/2024
The vulnerability described in CVE-2000-0873 affects the netstat utility on AIX operating systems version 4.x.x, specifically concerning the -Zi command line option. This flaw represents a significant security concern within the Unix-based system environment as it demonstrates inadequate privilege controls and access restrictions that could be exploited by malicious local users. The netstat command is a fundamental network diagnostic tool used to display network connections, routing tables, interface statistics, and other network-related information. When the -Zi option is improperly handled, it creates an avenue for unauthorized modification of critical network interface statistics.
The technical implementation of this vulnerability stems from insufficient input validation and access control mechanisms within the netstat utility. The -Zi option is designed to clear network interface statistics, but the security controls that should normally prevent unauthorized access to this functionality are inadequately enforced. This allows local users who may not possess administrative privileges to execute the command and clear network statistics, effectively erasing logs of network activity that could be crucial for security monitoring and forensic analysis. The flaw essentially creates a backdoor mechanism within a system administration tool that should normally be restricted to privileged users only.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to manipulate network monitoring data and potentially conceal malicious activities. Network administrators rely on consistent and accurate interface statistics to detect anomalies, monitor network performance, and identify potential security breaches. When local users can clear these statistics, they can effectively remove evidence of network reconnaissance, unauthorized access attempts, or other suspicious activities that would normally trigger security alerts. This capability significantly undermines the integrity of network monitoring systems and can mask ongoing attacks or successful compromises.
From a cybersecurity perspective, this vulnerability aligns with CWE-284, which addresses improper access control, and represents a classic example of insufficient privilege checking within system utilities. The attack pattern follows ATT&CK technique T1070.003, which involves clearing windows system logs, though adapted for network interface statistics. The vulnerability also relates to CWE-310, concerning cryptographic weaknesses, as the improper access control could potentially facilitate more sophisticated attacks that rely on manipulating network data. Organizations using AIX 4.x.x systems are particularly vulnerable because the flaw exists at the base operating system level rather than in application software, making it more fundamental and harder to patch without system-level updates.
The mitigation strategy for this vulnerability requires immediate implementation of proper access controls and privilege management within the AIX operating system. System administrators should ensure that only authorized users with appropriate privileges can execute the netstat command with the -Zi option. This can be achieved through proper file permissions, access control lists, and user privilege management. Additionally, organizations should implement comprehensive monitoring of system utilities to detect unauthorized access attempts or modifications to network statistics. Regular security audits should verify that privilege controls are properly enforced and that network monitoring systems maintain the integrity of their data sources. The most effective long-term solution involves upgrading to newer AIX versions where these access control mechanisms have been properly implemented and validated.