CVE-2005-0263 in AIX
Summary
by MITRE
Buffer overflow in netpmon on AIX 5.1, 5.2, and 5.3 allows local users to execute arbitrary code via a long -O argument.
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Analysis
by VulDB Data Team • 06/05/2024
The vulnerability identified as CVE-2005-0263 represents a critical buffer overflow flaw within the netpmon utility on IBM AIX operating systems version 5.1, 5.2, and 5.3. This issue arises from insufficient input validation when processing command line arguments, specifically the -O option, which creates a pathway for malicious exploitation. The netpmon utility is designed for network monitoring and packet capture functionality, making it a potentially valuable target for attackers seeking to gain unauthorized system access. The vulnerability stems from the improper handling of user-supplied input parameters, where the application fails to enforce bounds checking on the length of the -O argument. This oversight allows attackers to provide excessively long input strings that exceed the allocated buffer space, resulting in memory corruption that can be leveraged for code execution. The flaw exists at the application layer and affects the operating system's security posture by providing a local privilege escalation vector that does not require network connectivity or remote access. According to CWE classification, this vulnerability maps to CWE-121 which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack surface is particularly concerning because it requires only local system access to exploit, making it accessible to users who already have login privileges on the affected systems. The operational impact of this vulnerability extends beyond simple code execution as it enables attackers to potentially escalate privileges, modify system files, or establish persistent access mechanisms within the target environment. The affected AIX versions represent enterprise-level operating systems commonly deployed in mission-critical environments, where such vulnerabilities could compromise sensitive data and system integrity. From an attack perspective, this vulnerability aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation" and T1059 which involves "Command and Scripting Interpreter" as attackers can leverage the executed code to perform further malicious activities. The vulnerability demonstrates a classic security flaw in software development practices where input validation and memory management were not adequately implemented. The buffer overflow occurs due to the application's failure to properly validate the length of the -O argument before copying it into a fixed-size buffer, creating an opportunity for attackers to overwrite critical memory segments including return addresses or function pointers. This type of vulnerability is particularly dangerous in enterprise environments where AIX systems often run critical network monitoring tools and may be subject to less stringent security monitoring compared to other system components. The exploitability of this vulnerability is enhanced by the fact that it requires no special network conditions or external dependencies, making it a straightforward local privilege escalation vector. Security professionals should note that this vulnerability highlights the importance of regular patch management and input validation practices in system security. The remediation strategy involves applying the appropriate IBM AIX security patches that address the buffer overflow in netpmon, along with implementing proper input validation mechanisms to prevent similar issues in other applications. Organizations should also consider implementing additional security controls such as privilege separation and monitoring for unusual command line arguments that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of secure coding practices and the need for comprehensive security testing of system utilities, particularly those with elevated privileges or system-level access capabilities.