CVE-2021-38995 in AIX
Summary
by MITRE • 02/24/2022
IBM AIX 7.1, 7.2, 7.3, and VIOS 3.1 could allow a non-privileged local user to exploit a vulnerability in the AIX kernel to cause a denial of service. IBM X-Force ID: 213073.
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Analysis
by VulDB Data Team • 02/26/2022
This vulnerability affects IBM AIX operating systems version 7.1, 7.2, 7.3, and VIOS 3.1, representing a significant kernel-level weakness that could be exploited by local users. The flaw manifests as a denial of service condition that can be triggered by non-privileged users, making it particularly concerning for system stability and availability. The vulnerability resides within the AIX kernel itself, indicating a fundamental issue in the core operating system components that handle system resources and user requests. This type of vulnerability directly impacts the integrity of the operating system's core functions and can potentially disrupt critical business operations that depend on these systems.
The technical nature of this vulnerability involves a specific kernel flaw that allows local users to cause system instability through kernel memory management or resource handling mechanisms. While the exact technical details of the kernel exploit are not fully disclosed in the CVE description, the classification as a kernel-level vulnerability suggests an issue with how the operating system processes certain system calls or handles memory allocation. This could involve buffer overflows, memory corruption, or improper access control mechanisms within kernel space. The vulnerability's impact is specifically targeted at causing denial of service rather than arbitrary code execution, which limits its potential for more severe exploitation but still represents a significant threat to system availability and operational continuity.
The operational impact of this vulnerability extends beyond simple system crashes or restarts, as it affects the fundamental stability of enterprise systems running AIX. Organizations relying on these systems for critical business operations could experience unexpected downtime, service interruptions, and potential data loss during denial of service events. The local user exploitation aspect means that even users with minimal privileges could trigger these conditions, potentially allowing for insider threats or compromised accounts to cause significant disruption. This vulnerability particularly affects enterprise environments where AIX systems are used for mission-critical applications, database servers, and other infrastructure components that require high availability and reliability.
Organizations should prioritize immediate patching and mitigation strategies for this vulnerability, as the potential for disruption is significant. The recommended approach includes applying the latest security patches provided by IBM to address the kernel-level flaw directly. System administrators should also implement monitoring solutions to detect unusual system behavior that might indicate exploitation attempts, particularly focusing on kernel-level activities and resource consumption patterns. Additionally, implementing proper access controls and privilege management can help limit the potential impact of local users who might attempt to exploit this vulnerability. The vulnerability aligns with CWE-119 which addresses "Improper Access to Resources via Vulnerable Pathname Handling" and potentially CWE-121 which covers "Stack-based Buffer Overflow" in kernel contexts. From an ATT&CK perspective, this vulnerability maps to T1499.004 which involves "Endpoint Denial of Service" and represents a significant threat to system availability and operational resilience in enterprise environments.