CVE-2009-4361 in AIX
Summary
by MITRE
Multiple buffer overflows in qoslist in IBM AIX 6.1 allow local users to cause a denial of service (application crash) or possibly gain privileges via a long string argument. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 02/18/2017
The vulnerability identified as CVE-2009-4361 represents a critical buffer overflow issue within the qoslist component of IBM AIX 6.1 operating system. This flaw exists in the quality of service list functionality that manages network traffic prioritization and resource allocation. The vulnerability stems from inadequate input validation mechanisms within the qoslist utility, which processes command line arguments without proper bounds checking. When maliciously crafted long string arguments are passed to this utility, the system fails to properly handle the excessive input data, leading to memory corruption that can result in unpredictable behavior.
The technical implementation of this vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions where insufficient space is allocated for data storage, and CWE-122, which covers heap-based buffer overflow scenarios. These buffer overflow conditions occur when the qoslist utility attempts to store user-provided string arguments in fixed-size memory buffers without validating the input length against buffer capacity. The flaw specifically affects local users who can exploit this condition through direct execution of the qoslist utility with crafted arguments, potentially manipulating the program's execution flow through stack corruption or memory overwrite attacks.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable privilege escalation attacks. When the buffer overflow occurs, the application crash may be leveraged by an attacker to execute arbitrary code with elevated privileges, particularly if the qoslist utility runs with higher permissions. The local user exploitation aspect means that any user with access to the system can potentially trigger this vulnerability, making it particularly dangerous in multi-user environments where privilege separation is crucial for system security. The denial of service component can render network management functions unavailable, affecting critical infrastructure operations that depend on quality of service configurations.
Mitigation strategies for CVE-2009-4361 should prioritize immediate patch application from IBM, as this vulnerability was addressed through official security updates for AIX 6.1 systems. System administrators should implement input validation controls at the application level, ensuring that all command line arguments passed to qoslist are properly sanitized before processing. The principle of least privilege should be enforced by verifying that the qoslist utility operates with minimal required permissions, reducing potential impact if exploitation occurs. Network segmentation and monitoring should be implemented to detect anomalous behavior patterns that might indicate exploitation attempts. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other system components, as this represents a common attack vector that follows established patterns documented in the ATT&CK framework under T1068 for exploit private vulnerabilities and T1499 for network denial of service attacks.