CVE-2000-1216 in AIX
Summary
by MITRE
Buffer overflow in portmir for AIX 4.3.0 allows local users to corrupt lock files and gain root privileges via the echo_error routine.
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Analysis
by VulDB Data Team • 11/12/2024
The vulnerability described in CVE-2000-1216 represents a critical buffer overflow condition within the portmir utility running on AIX 4.3.0 operating systems. This flaw exists specifically within the echo_error routine of the portmir program, which serves as a network monitoring tool for AIX environments. The buffer overflow occurs when the program processes error messages, allowing malicious input to exceed the allocated buffer space and overwrite adjacent memory locations. This particular vulnerability is classified under CWE-121 as a stack-based buffer overflow, where insufficient bounds checking permits data to overwrite critical program memory regions including return addresses and control data. The security implications are severe as the vulnerability is exploitable by local users who possess basic system access, making it particularly dangerous in multi-user environments where privilege escalation opportunities can be leveraged for unauthorized system control.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise and potential data corruption. When local users exploit the buffer overflow through the echo_error routine, they can manipulate memory contents to redirect program execution flow, effectively allowing them to execute arbitrary code with root privileges. The specific target of this attack is the lock file corruption mechanism within the portmir utility, which creates an attack vector where adversaries can manipulate system lock files to gain elevated access rights. This represents a classic privilege escalation attack pattern that aligns with ATT&CK technique T1068, which describes the exploitation of vulnerabilities to gain elevated privileges. The vulnerability's exploitation requires minimal privileges since it targets a local utility rather than requiring network access or complex external attack vectors, making it particularly dangerous in environments where users have legitimate access to system monitoring tools.
Mitigation strategies for CVE-2000-1216 must address both immediate system protection and long-term security posture improvements. System administrators should immediately apply the relevant AIX security patches provided by IBM to resolve the buffer overflow in the portmir utility. Additionally, implementing privilege separation measures and access controls for the portmir utility can limit the potential impact of such vulnerabilities. The recommended approach includes disabling unnecessary network monitoring utilities when not actively required, implementing proper input validation and bounds checking for all system utilities, and establishing regular security audits to identify similar vulnerabilities in legacy system components. Organizations should also consider implementing intrusion detection systems to monitor for suspicious activities related to lock file modifications and privilege escalation attempts. The vulnerability highlights the importance of maintaining up-to-date system patches and following secure coding practices, particularly in legacy environments where older system components may contain unpatched security flaws that can be exploited by determined attackers. Proper system hardening practices, including the principle of least privilege and regular security assessments, form essential components of defense-in-depth strategies that can prevent exploitation of similar buffer overflow vulnerabilities in other system utilities and applications.